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1.
Rev. Ciênc. Plur ; 9(3): 32620, 26 dez. 2023. tab, ilus, graf
Article in Portuguese | LILACS, BBO | ID: biblio-1524464

ABSTRACT

Introdução:Sabe-se que a busca pela estética é algo cada vez mais crescente. Dentre os procedimentos mais procurados na odontologia estética, destaca-se o clareamento dental de consultório. Diante disso, ainda são poucos os estudos que avaliam os efeitos dos agentes clareadores de diferentes pHs na efetividade clareadora e na sensibilidade dentária.Objetivo:Avaliar a sensibilidade dentária e a eficácia clareadora de géis clareadores à base de peróxido de hidrogênio a 35% com diferentes pHs.Metodologia:Trata-se de um relato de três casos, descritivo e observacional, do tipo boca dividida (split-mouth) para cada estratégia clareadora (gel clareador com pH básico e gel clareador com pH ácido). Foram avaliados três pacientes de25, 26e 27anos de idade.Realizou-se registro de cor por meio da escala VITAClassical e avaliação da sensibilidade dentária pela escala visual analógica. Resultados:Todos os pacientes avaliados apresentaram cor A3 no registro de cor inicial e, após o clareamento dental,atingiram a cor A1. Todos relataram uma maior sensibilidade no hemiarco direito (local onde foi aplicada o gel clareador Whiteness HP que possui pH ácido. Dois pacientes relataram sensibilidade dentária no hemiarco esquerdo em que foi aplicado o gel clareador de pH básico. Conclusões:Observa-se a eficácia clínica dos géis clareadores de consultório à base de peróxido de hidrogênio a 35% na estabilidade de cor após o tratamento clareador, independente do seu pH. Ademais, nota-se que o gel clareador de pH básico promoveu menor sensibilidade pós-operatória (AU).


Introduction:It is known that the search for aesthetics is something increasingly growing. Among the most sought-after procedures in cosmetic dentistry, in-office tooth bleaching stands out. Therefore, there are still few studies that evaluate the effects of bleaching agents ofdifferent pHs on bleaching effectiveness and tooth sensitivity.Objective:To evaluate tooth sensitivity and bleaching efficacy of 35% hydrogen peroxide-based tooth bleaching gels with different pHs.Methodology:This is a report of three cases, descriptive and observational, of the split-mouth type for each bleaching strategy (bleaching gel with basic pH and bleaching gel with acidic pH). Three patients aged 25, 26 and 27 years were evaluated. Color registration was performed using the VITA Classical scale and tooth sensitivity was evaluated using the visual analogue scale.Results:All evaluated patients presented color A3 in the initial color registration and, after tooth bleaching, reached color A1. All reported greater sensitivity in the right hemi-arch (place where the Whiteness HP bleaching gel with an acid pH was applied. Two patients reported tooth sensitivity in the left hemi-arch where the basic pH bleaching gel was applied.Conclusions:The clinical efficacy of in-office tooth bleaching gels based on 35% hydrogen peroxide in terms of color stability after bleaching treatment is observed, regardless of its pH. In addition, it is noted that the basic pH bleaching gel promoted less postoperative sensitivity (AU).


Introducción: Se sabe que la búsqueda de la estética es algo cada vez más creciente. Entre los procedimientos más populares en odontología estética, se destaca el blanqueamiento dental en consultorio. Ante esto, aún existen pocos estudios que evalúen los efectos de agentes blanqueadores de diferentes pHs sobre la efectividad del blanqueamiento y la sensibilidad dental.Objetivo: Evaluar la sensibilidad dental y la eficacia blanqueadora de geles blanqueadores a base de peróxido de hidrógeno al 35 % con diferentes pH. Metodología: Este es un reporte de tres casos, descriptivo y observacional, del tipo boca partida para cada estrategia de blanqueamiento (gel blanqueador con pH básico y gel blanqueador con pH ácido). Se evaluaron tres pacientes de 25, 26 y 27 años. El registro de color se realizó con la escala clásica VITA y la sensibilidad dental se evaluó con la escala analógica visual.Resultados: Todos los pacientes evaluados presentaron color A3 en el registro de color inicial y, después del blanqueamiento dental, alcanzaron el color A1. Todos refirieron mayor sensibilidad en la hemiarcada derecha (lugar donde se aplicó el gel blanqueador de pH ácido Whiteness HP). Dos pacientes refirieron sensibilidad dental en la hemiarcadaizquierda donde se aplicó el gel blanqueador de pH básico.Conclusiones: Se observala eficacia clínica de los geles blanqueadores de consultorio a base de peróxido de hidrógeno al 35% en cuanto a la estabilidad del color tras el tratamiento blanqueador, independientemente de su pH. Además, se observa que el gel blanqueador de pH básico promovió una menor sensibilidad postoperatoria (AU).


Subject(s)
Humans , Adult , Color , Dentin Sensitivity/complications , Tooth Bleaching Agents/adverse effects , Hydrogen Peroxide , Treatment Outcome , Observational Study , Hydrogen-Ion Concentration
2.
RFO UPF ; 27(1): 14-29, 08 ago. 2023. ilus, tab, graf
Article in Portuguese | LILACS, BBO | ID: biblio-1509381

ABSTRACT

Introdução: O efeito branqueador dos dentifrícios contendo Blue covarine é fundamentado no seu mecanismo de ação, caracterizado pela sua deposição na superfície dentária, alterando a percepção da cor. Objetivo: Revisar a literatura e buscar evidência científica sobre o efeito branqueador do Blue Covarine em tecidos mineralizados e materiais restauradores estéticos. Materiais e métodos: Para a revisão da literatura foram feitas buscas nas bases de dados PubMed, LILACS, BBO, SciELO e MEDLINE para identificar estudos clínicos e laboratoriais que avaliassem a ação branqueadora do agente óptico Blue covarine. Como estratégia de busca foram utilizados os descritores "Blue covarine", "Blue covarine e pasta de dentes", "Blue covarine and toothpaste", "Blue covarine e dentifrícios", "Blue covarine and dentifrices", "Blue covarine e dentifrícios branqueadores", "Blue covarine and whitening dentifrices", "Blue covarine e dentifrícios clareadores", "Blue covarine and bleaching dentifrices", "Blue covarine e pasta de dentes branqueadoras", "Blue covarine and whitening toothpaste", "Blue covarine e pasta de dentes clareadoras", "Blue covarine and bleaching toothpaste". Resultados: Dois pesquisadores selecionaram e analisaram criticamente 31 artigos, sendo 2 revisões da literatura, 4 estudos clínicos e 25 estudos laboratoriais. Divergências quanto ao desenho de estudo, métodos, amostra, critérios clínicos e parâmetros laboratoriais foram observados, além de conflitos de interesse. Conclusão: O Blue Covarine presente nos dentifrícios branqueadores parece ser efetivo na promoção do branqueamento dentário apenas quando associado aos agentes abrasivos presentes nas formulações, evidenciando que ensaios clínicos e laboratoriais, com metodologias semelhantes, são necessários para se obter evidência científica conclusiva sobre o efeito deste agente branqueador.(AU)


Introduction: The whitening effect of dentifrices containing Blue Covarine is based on its mechanism of action, characterized by its deposition on the tooth surface, altering the perception of color. Objective: To review the literature and seek scientific evidence on the whitening effect of Blue Covarine on mineralized tissues and aesthetic restorative materials. Materials and methods: For the literature review, searches were carried out in the PubMed, LILACS, BBO, SciELO and MEDLINE databases, in order to identify clinical and laboratory studies that evaluated the whitening action of the optical agent Blue Covarine. As a search strategy, the descriptors "Blue Covarine", "Blue Covarine and toothpaste", "Blue Covarine and dentifrices", "Blue Covarine and whitening dentifrices", "Blue Covarine and bleaching dentifrices", "Blue Covarine and whitening toothpaste", "Blue Covarine and bleaching toothpaste". Results: Two researchers selected and critically analyzed 31 articles, including 2 literature reviews, 4 clinical studies and 25 laboratory studies. Differences in study design, methods, sample, clinical criteria and laboratory parameters were observed, in addition to conflicts of interest. Conclusion: Blue Covarine present in whitening dentifrices seems to be effective in promoting dental whitening only when associated with abrasive agents present in the formulations, showing that clinical and laboratory tests, with similar methodologies, are necessary to obtain conclusive scientific evidence on the effect of this bleaching agent.(AU)


Subject(s)
Humans , Tooth Bleaching/methods , Dentifrices/chemistry , Isoindoles/chemistry , Tooth Bleaching Agents/chemistry , Metalloporphyrins/chemistry , Colorimetry , Dental Enamel/chemistry
3.
Article in English | WPRIM | ID: wpr-981111

ABSTRACT

OBJECTIVES@#This study aimed to observe the color rebound and rebound rates of non-pulp discolored teeth within 1 year after routine internal bleaching to guide clinical practice and prompt prognosis.@*METHODS@#In this work, the efficacy of bleaching was observed in 20 patients. The color of discolored teeth was measured by using a computerized colorimeter before bleaching; immediately after bleaching; and at the 1st, 3rd, 6th, 9th, and 12th months after bleaching. The L*, a*, and b* values of the color of cervical, mesial, and incisal parts of the teeth were obtained, and the color change amounts ΔE*, ΔL*, Δa*, and Δb* were calculated. The overall rebound rate (P*) and the color rebound velocity (V*) were also analyzed over time.@*RESULTS@#In 20 patients following treatment, the average ΔE* of tooth color change was 14.99. After bleaching, the neck and middle of the teeth ΔE* and ΔL* decreased in the 1st, 3rd, 6th, 9th, and 12th months, and the differences were statistically significant. Meanwhile, from the 9th month after bleaching, the rebound speed was lower than that in the 1st month, and the difference was statistically significant. The incisal end of the tooth ΔE* and ΔL* decreased in the 6th, 9th, and 12th months after bleaching, and the differences were statistically significant. No significant difference was found in the rebound speed between time points. However, this rate settled after the 9th month, with an average color rebound rate of 30.11% in 20 patients.@*CONCLUSIONS@#The results indicated that internal bleaching could cause a noticeable color change on pulpless teeth. The color rebound after bleaching was mainly caused by lightness (L*), which gradually decreased with time, and it was slightly related to a* and b*. The color of the teeth after internal bleaching rebounded to a certain extent with time, but the color rebound speed became stable from the 9th month. Clinically, secondary internal bleaching can be considered at this time according to whether the colors of the affected tooth and the adjacent tooth are coordinated and depending on the patient's needs.


Subject(s)
Humans , Tooth Bleaching/methods , Tooth, Nonvital/drug therapy , Color , Tooth Discoloration/drug therapy , Tooth , Hydrogen Peroxide/therapeutic use , Tooth Bleaching Agents/therapeutic use
4.
Int. j. odontostomatol. (Print) ; 16(4): 497-503, dic. 2022. tab
Article in English | LILACS | ID: biblio-1421848

ABSTRACT

To try to reduce the deleterious effects of tooth whitening, bioactive materials have been used. Forty enamel/dentin blocks were stained on dark tea and randomly assigned into four groups (n=10): control group (unbleached), HP35 % (35 % hydrogen peroxide), BG45S5 (Bioglass 45S5® incorporated into HP35 %), and BIO (Biosilicate® incorporated into HP35 %). Colorimetric analysis and microhardness evaluation was performed at baseline, 24 hours and 7 days after the final whitening session. Two-way ANOVA for repeated measures and Bonferroni test was used at a significance level of 5 %. All the coordinates (ΔL*, Δa*, Δb*, ΔE00 and WID) showed a difference between the control group and the experimental ones (p0.05), which suggest a color stability over a week. In contrast, after 7 days, the WID showed that control and PH35 % were different than the other groups (p 0.05). The microhardness did not change over time (p>0.05), except for 35 % HP. In conclusion Bioglass 45S5® and Biosilicate® prevented enamel damage without negatively affect the whitening efficacy.


Para intentar reducir los efectos nocivos del aclaramiento dental, se han usado materiales bioactivos. Cuarenta bloques de esmalte/dentina se tiñeron con té oscuro y se asignaron al azar en cuatro grupos (n=10): grupo de control (sin blanquear), HP35% (peróxido de hidrógeno al 35 %), BG45S5 (Bioglass 45S5® incorporado en HP35%) y BIO (Biosilicato® incorporado a HP35%). El análisis colorimétrico y la evaluación de la microdureza se realizaron al inicio del estudio, 24 horas y 7 días después de la última sesión de blanqueamiento. Se utilizó ANOVA de dos vías para medidas repetidas y la prueba de Bonferroni a un nivel de significancia del 5 %. Todas las coordenadas (ΔL*, Δa*, Δb*, ΔE00 y WID) mostraron diferencia entre el grupo control y el experimental (p0.05), lo que sugiere una estabilidad del color durante una semana. En cambio, a los 7 días, el WID mostró que el control y el PH35 % eran diferentes a los demás grupos (p 0.05). La microdureza no cambió con el tiempo (p>0.05), excepto para 35 % HP. En conclusión Bioglass 45S5® y Biosilicate® previnieron el daño del esmalte sin afectar negativamente la eficacia del blanqueamiento.


Subject(s)
Animals , Dental Caries/drug therapy , Dental Enamel/drug effects , Tooth Bleaching Agents/therapeutic use , Cattle , Color , Glass/chemistry , Hardness , Hydrogen Peroxide/chemistry
5.
Rev. Ciênc. Méd. Biol. (Impr.) ; 21(2): 187-192, out.2022. tab
Article in Portuguese | LILACS | ID: biblio-1399805

ABSTRACT

Introdução: os enxaguantes bucais clareadores tem sido muito utilizados, porém sua eficiência e efeitos colaterais trazem questionamentos. Objetivo: este ensaio clínico teve como objetivo avaliar se o enxaguante bucal clareador, contendo peróxido de hidrogênio a 1,5%, apresenta ação clareadora e se há algum efeito secundário na cavidade bucal. Metodologia: foram selecionados 10 voluntários com idade média de 21,5 anos, submetidos a avaliação da cor dos dentes com auxílio do espectrômetro em 3 momentos: inicial; com 15 e com 30 dias de uso do enxaguante. A avaliação dos efeitos colaterais foi realizada a partir da coleta de saliva estimulada em 4 momentos: antes e depois ao primeiro uso do produto, com 15 e com 30 dias, e realizadas as análises laboratoriais: fluxo salivar; pH; quantidade de Streptococcus mutans e de Lactobacillus. A normalidade dos dados foi verificada pelo teste de Shapiro-Wilk, comparação de cor pelo teste t dependente, comparação dos microrganismos pelos testes ANOVA de medidas repetida e Tukey. Resultados: as análises de cor dos dentes não evidenciaram nenhuma alteração significativa em nenhum dos tempos investigados. No fluxo salivar, pH e Lactobacillus não houveram alterações significativas. Na quantidade de Streptococcus mutans notou-se um aumento significativo quando comparado os valores após o primeiro uso e com 30 dias. Conclusão: a solução de enxague bucal contendo peróxido de hidrogênio a 1,5% não apresentou alteração significativa na coloração dos dentes e nenhum efeito colateral significativo na atividade cariogênica de acordo com os testes e períodos avaliados.


Introduction: whitening mouthwashes have been widely used, but their efficiency and side effects raise questions. Objective: this clinical trial aimed to assess whether the bleaching mouthwash, containing 1.5% hydrogen peroxide, has a bleaching action and whether there are any side effects in the oral cavity. Methods: 10 volunteers were selected, with a mean age of 21.5 years, who underwent tooth color evaluation with the aid of a spectrometer in 3 moments: initial; with 15 and 30 days of using the washes. The evaluation of side effects was performed from the collection of stimulated saliva in 4 moments: before and after the first use of the product, at 15 and 30 days, and laboratory analyzes were carried out: salivary flow; pH; the number of Streptococcus mutans and Lactobacillus. Normal distribution was verified with Shapiro-Wilk test, comparisons of color were performed with t-test, comparisons of the microorganisms were performed with repeated measures ANOVA and Tukey tests. Results: the analysis did not show any significant changes in any of the investigated times. There were no significant changes in the salivary flow, pH and Lactobacillus. The number of Streptococcus mutans, was noted a significant increase when comparing the values after the first use and with 30 days. Conclusion: the mouthwash containing 1.5% hydrogen peroxide was not shown any significant alterations in the color teeth. There were not significant collateral effects on the cariogenic activity according to the tests and periods evaluated.


Subject(s)
Humans , Male , Female , Adult , Dental Caries Activity Tests , Tooth Bleaching Agents , Hydrogen Peroxide , Mouthwashes , Streptococcus mutans , Lactobacillus
6.
Int. j. odontostomatol. (Print) ; 16(3): 435-440, sept. 2022. ilus, tab
Article in English | LILACS | ID: biblio-1405309

ABSTRACT

ABSTRACT: The purpose of this research was to determine the cleaning and whitening ability of two charcoal containing toothpastes compared with baking soda, activated charcoal and a hydrogen peroxide containing whitening toothpaste. Tea-stained enamel/dentin slices were mounted dentin side down in cylinders of auto-polymerizing acrylic and subjected to simulated brushin g. Total color, ΔE, and stained area were measured using a reflectance spectrophotometer and ImageJ software using a Hue, Chroma, and Brightness color threshold method; respectively, at prescribed brushing intervals of baseline, months 1, 6 and 12. A two- w ay repeated measure analysis of variance was performed, with included factors being toothpaste group and time. Statistical analys is revealed the included factor of brushing time interval was significant (p<0.05) for both ΔE and stained area. There was significant interaction for both main effects (p<0.05) for the dependent variable of stained area alone. Significant reduction in ΔE values occurred in all groups except Optic White at the 1-month interval. Statistically significant reduction in stained area occurred at 1-mon th for the baking soda group only. Post-hoc Tukey HSD tests revealed there was significant group*time interaction for baking soda at month 1 for the variable stained area. The charcoal containing (Crest 3D with Charcoal and Colgate Essentials) and non-charcoal contai ning toothpastes (Optic White) only produced a significant stain removal at the 6-month interval.


RESUMEN: El propósito de esta investigación fue determinar la capacidad de limpieza y blanqueamiento de dos pastas dentales que contienen carbón en comparación con bicarbonato de sodio, carbón activado y una pasta dental blanqueadora que contiene peróxido de hidrógeno. Los cortes de esmalte/dentina teñidos con té se montaron con el lado de la dentina hacia abajo, en cilindros de acrílico autopolimerizable y se sometieron a un cepillado simulado. El color total, ΔE y el área teñida se midieron usando un espectrofotómetro de reflectancia y el software ImageJ usando un método de umbral de color de tono, croma y brillo; respectivamente, en los intervalos de cepillado prescritos al inicio, los meses 1, 6 y 12. Se realizó un análisis de varianza de medidas repetidas de dos vías, con factores incluidos como el grupo de pasta de dientes y el tiempo. El análisis estadístico reveló que el factor incluido del intervalo de tiempo de cepillado fue significativo (p<0,05) tanto para ΔE como para el área manchada. Hubo interacción significativa para ambos efectos principales (p<0,05) para la variable dependiente del área teñida sola. Se produjo una reducción significativa en los valores de ΔE en todos los grupos excepto Optic White en el intervalo de 1 mes. Se produjo una reducción estadísticamente significativa en el área manchada al mes solo para el grupo de bicarbonato de sodio. Las pruebas post-hoc Tukey HSD revelaron que hubo una interacción significativa entre grupo y tiempo para el bicarbonato de sodio en el mes 1 para el área manchada variable. Las pastas dentales que contenían carbón (Crest 3D con Charcoal y Colgate Essentials) y las pastas de dientes que no contenían carbón (Optic White) solo produjeron una eliminación significativa de las manchas en el intervalo de 6 meses.


Subject(s)
Humans , Charcoal/chemistry , Dental Enamel , Homeopathy , Tooth Bleaching/methods , Toothbrushing/methods , Toothpastes/chemistry , Plant Extracts/chemistry , Tooth Bleaching Agents/chemistry
7.
Rev. Cient. CRO-RJ (Online) ; 7(1): 24-30, Jan-Apr 2022.
Article in English | LILACS, BBO | ID: biblio-1382138

ABSTRACT

Objective: The aim of this study was to compare the effectiveness of two bleaching treatment protocols to treat dental staining after orthodontic debonding. Materials and Methods: Twenty four bovine teeth were submitted to orthodontic bracket (Morelli, Edgewise Prescription, Slot 22) bonding (Transbond XT, 3M) and debonding, which were divided into three groups according to the bleaching protocol: hydrogen peroxide 10% (Whiteness, FGM) simulating home bleaching protocol (Home Bleaching Group), hydrogen peroxide 35% Whiteness, FGM) simulating dental office bleaching protocol (Office Bleaching Group) and Control Group, which was not exposed to any dental bleaching protocol, and stored in distilled water at 37°C. The specimens were submitted to the following processes: aging of resin remaining tegs by ultraviolet (UV), staining with coffee solution and tooth bleaching with 10% hydrogen peroxide (G1) and 35% hydrogen peroxide (G2). The color stability analysis (CIE color space L* a* b* was performed with Vita Easyshade Compact spectrophotometer before bonding (T0), after aging and staining processes (T1) and after bleaching treatment (T2). All teeth were stored in distilled water at 37°C between experimental times. The comparison between the groups and time effect evaluation were performed using ANOVA / Tukey ( =0.05) and ANOVA-MR with Bonferroni correction ( =0.016), respectively. Results: The color stability parameters L *, a * and b * indicated, with the exception of GC, a tendency of increase in T1 (G1 - L *: 76.72 ± 13.39; a *: 6.68 ± 3.71; b *: 43.14 ± 4.04 / G2: - L *: 75.78 ± 4.66; a *: 8.13 ± 2.75; b *: 43.42 ± 8.87), which reflected the tendency to decrease brightness in T1, followed by a tendency to return to T0 values (G1 - L *: 82.92 ± 12.16; a *: 4.25 ± 3.68; b *: 39.40 ± 9.49 / G2: - L *: 83.76 ± 8.02; a *: 8.76 ± 4.08; b *: 47.90 ± 5.88). Significant differences were observed in G2 in a * (T1: 8.13 ± 2.75, T2: 8.76 ± 4.08) and b * (T1: 43.42 ± 8.87; T2: 47.90 ± 5.88), indicating that this group did not return to the values presented in T0 (a *: 1.81 ± 1.70; b *: 35.40 ± 5.08) (p <0.05). Conclusion: Based on the results of this study, it can be concluded that home bleaching protocol presented better performance for dental surface whitening in an eventual staining after orthodontic debonding.


Objetivo: O objetivo deste estudo foi comparar a eficácia de dois protocolos de tratamento clareador para manchas dentárias causadas após a descolagem ortodôntica. Materiais e Métodos: Vinte e quatro dentes bovinos foram submetidos à colagem e descolagem de braquetes ortodônticos (Morelli, Prescrição Edgewise, Slot 22") (Transbond XT, 3M), que foram divididos em três grupos de acordo com o protocolo de clareamento: peróxido de hidrogênio 10% (Whiteness, FGM) simulando protocolo de clareamento caseiro (grupo clareamento caseiro), peróxido de hidrogênio 35% Whiteness, FGM) simulando protocolo de clareamento de consultório (grupo clareamento de consultório) e Grupo Controle, que não foi exposto a nenhum protocolo de clareamento dental, armazenado em água destilada a 37ºC. Os corpos de prova foram submetidos aos seguintes processos: envelhecimento das resinas remanescentes por ultravioleta (UV), manchamento em solução de café e clareamento dental com peróxido de hidrogênio 10% (G1) e peróxido de hidrogênio 35% (G2). A análise de estabilidade de cor (sistema CIE L* a* b*) foi realizada com espectrofotômetro Vita Easyshade Compact antes da colagem (T0), após os processos de envelhecimento e manchamento (T1) e após o tratamento clareador (T2). Todos os dentes foram armazenados em água destilada a 37 °C entre os tempos experimentais. A comparação entre os grupos e a avaliação do efeito do tempo foram realizadas utilizando ANOVA/Tukey ( =0,05) e ANOVA-MR com correção de Bonferroni ( =0,016), respectivamente. Resultados: Os parâmetros de estabilidade de cor L *, a* e b* indicaram, com exceção do GC, tendência de aumento em T1 (G1 - L*: 76,72 ± 13,39; a*: 6,68 ± 3,71; b*: 43,14 ± 4,04 / G2: - L* : 75,78 ± 4,66; a*: 8,13 ± 2,75; b*: 43,42 ± 8,87), o que refletiu a tendência de diminuição do brilho em T1, seguido de uma tendência de retorno aos valores de T0 (G1- L*: 82,92 ± 12,16 ; a*: 4,25 ± 3,68; b*: 39,40 ± 9,49 / G2: - L*: 83,76 ± 8,02; a*: 8,76 ± 4,08; b*: 47,90 ± 5,88). Foram observadas diferenças significativas no G2 em a* (T1: 8,13 ± 2,75, T2: 8,76 ± 4,08) e b* (T1: 43,42 ± 8,87; T2: 47,90 ± 5,88), indicando que esse grupo não retornou aos valores apresentados em T0 (a*: 1,81 ± 1,70; b*: 35,40 ± 5,08) (p<0,05). Conclusão: Com base nos resultados deste estudo, pode-se concluir que o protocolo de clareamento caseiro apresentou melhor desempenho para o clareamento da superfície dentária em um eventual manchamento após a descolagem ortodôntica.


Subject(s)
Tooth Bleaching , Dental Debonding , Tooth Bleaching Agents , Materials Testing
8.
Chinese Journal of Stomatology ; (12): 509-515, 2022.
Article in Chinese | WPRIM | ID: wpr-935894

ABSTRACT

Objective: To investigate the effect of permeable resin on the surface structure, microhardness and color of tooth enamel after bleaching. Methods: Premolars extracted for orthodontic needs were selected (provided by the Department of Oral and Maxillofacial surgery of the first affiliated Hospital of Zhengzhou University) and randomly divided into A, B and C 3 groups. Each group was randomly divided into control subgroup, resin subgroup, bleaching subgroup and combined subgroup. Samples in the control subgroup did not receive any treatment. Those in the bleaching subgroup and combined subgroup were treated with cold light whitening. Those in the resin group and combined group were treated with permeable resin. Samples in the group A were observed by scanning electron microscope immediately after treatment and 2 weeks after treatment, and the microhardness of samples in the group B was measured before treatment, immediately after treatment and 2 weeks after treatment (the sample size of each time point was 8 in each subgroup). In group C, chromaticity was measured and chromatic aberration (ΔE value) was calculated before treatment, immediately after treatment and 1 and 2 weeks after treatment (10 samples in each subgroup). Results: Scanning electron microscope showed that the enamel surface of the resin subgroup and the combined group was smooth immediately after treatment, which was basically the same as that of the control subgroup, but covered with resin, and microporous defects and mineral deposits could be seen on the surface of the bleaching subgroup. Two weeks after treatment, the enamel surface of each subgroup was smooth, there was no obvious difference. Immediately after treatment, the microhardness of the control subgroup, resin subgroup, bleaching subgroup and combined subgroup were (354±33), (364±21), (411±30) and (350±17) HV, respectively (F=9.39,P<0.05). The microhardness of the bleaching subgroup was significantly higher than that of the other subgroups (P<0.05). There was no significant difference in microhardness among the four subgroups before treatment and 2 weeks after treatment (F=0.34, 2.75, P>0.05). Immediately after treatment, the ΔE values of the control subgroup, resin subgroup, bleaching subgroup and combined subgroup were 0.00±0.00, 2.29±1.86, 7.20±1.94 and 8.00±0.88, respectively (F=74.21,P<0.05); except that there was no significant difference between bleaching subgroup and combined subgroup (P>0.05), there were significant differences among the other subgroups (P<0.05). There was no significant difference in ΔE value among control subgroup, resin subgroup and bleaching subgroup at each time point (F=1.66, 0.30, 0.96, P>0.05). The difference in the combined subgroup immediately after treatment was significantly higher than that at 1 and 2 weeks after treatment (t=4.73, 4.23,P<0.05), but there was no significant difference between 1 and 2 weeks after treatment (t=0.75, P>0.05), and the color tended to be stable. Conclusions: When whitening healthy enamel, simple cold light whitening or cold light whitening combined with permeation resin can achieve whitening effect.


Subject(s)
Humans , Color , Dental Enamel , Hardness , Hydrogen Peroxide/pharmacology , Tooth Bleaching/adverse effects , Tooth Bleaching Agents/pharmacology
9.
Braz. dent. sci ; 25(1): 1-8, 2022. tab
Article in English | LILACS, BBO | ID: biblio-1354734

ABSTRACT

Objective: The present study compared the effect of whitening mouthrinses (WM) on the color change of stained resin composites (RC). Material and Methods: Cylindrical specimens (6mm-diameter and 1mm-thickness) were prepared with the following RC (n=60/group): Filtek Z350XT (Z350- methacrylate-based), Admira Fusion (AD- ormocer-based), TPH3 (TPH- methacrylate-based), and Beautifil II (BII- giomer/methacrylate-based). The initial color was assessed with reflectance spectrophotometer using CIE L*a*b* system. The specimens were immersed in staining broth during 14 days, submitted to color evaluation (ΔE1) and randomly allocated in 4 subgroups (n=15), according to WM adopted: Listerine Whitening (LW-2% hydrogen peroxide), Plax Whitening (PW-1.5% hydrogen peroxide), Bromelain/papain (BP-experimental solution), and Deionized water (DW-negative control). The whitening cycle consisted of RC immersion in WM for 1 min and in artificial saliva for 30 min, simulating 12 weeks, and final color assessment was performed (ΔE2). Color change data were analysed by ANOVA and Tukey's tests (α=5%). Results: After staining, TPH showed the lowest ΔE1 values and Z350 showed the highest color change (p=0.001). The whitening effect promoted by LW was significantly higher than color alteration obtained with PW (ΔE2), and BII showed the highest color change values (ΔE2) after whitening cycle. Conclusion: LW exhibited the greatest whitening potential on stained RC, mainly with the Giomer (Beautifill II) and the Ormocer-based (Admira Fusion) materials. Bromelain/papain solution showed no whitening effect on stained RC. (AU)


Objetivo: O presente estudo comparou o efeito de enxaguatórios clareadores (EC) na alteração de cor de resinas compostas (RC) previamente manchadas. Material e Métodos: Espécimes cilíndricos (6mm de diâmetro e 1mm de espessura) foram preparados com as seguintes RC (n=60/grupo): Filtek Z350XT (Z350- metacrilato), Admira Fusion (AD- ormocer), TPH3 (TPH- metacrilato), e Beautifil II (BII- giomer/metacrilato). A cor inicial foi mensurada com espectrofotômetro de reflectância utilizando o sistema CIE L*a*b*. Os espécimes foram imersos em um caldo de manchamento durante 14 dias, submetidos a avaliação de cor (ΔE1) e alocados aleatoriamente em 4 subgrupos (n=15), de acordo com EC adotado: Listerine Whitening (LW-peróxido de hidrogênio a 2%), Plax Whitening (PW- peróxido de hidrogênio a 1,5%), Bromelina/papaína (BP-solução experimental), e Água deionizada (AD- controle negativo). O ciclo clareador consistiu na imersão da RC no EC por 1 min e na saliva artificial por 30 min, simulando 12 semanas, e a cor final foi mensurada (ΔE2). Os dados de alteração de cor foram analisados pelos testes ANOVA e Tukey (α=5%). Resultados: Após o manchamento, TPH apresentou o menor valor de ΔE1 e Z350 apresentou a maior alteração de cor (p=0,001). O efeito clareador promovido pelo LW foi significativamente maior que o obtido com o PW (ΔE2) e BII teve a maior alteração de cor (ΔE2) após o ciclo clareador. Conclusão: LW exibiu maior potencial clareador nas RC manchadas. BII apresentou maior alteração de cor em resposta à ação clareadora de ambos enxaguatórios à base de peróxido de hidrogênio testados.(AU)


Subject(s)
Composite Resins , Tooth Bleaching Agents , Organically Modified Ceramics , Hydrogen Peroxide
10.
Braz. J. Pharm. Sci. (Online) ; 58: e19501, 2022. graf
Article in English | LILACS | ID: biblio-1383974

ABSTRACT

Abstract This study reviews the knowledge on the use of conventional dental whitening and the use of enzymes as a new approach in bleaching. A review of the literature was based on academic articles and on patents related to the use of enzymes in dental bleaching. Tooth whitening techniques used nowadays are well reported in the literature, and its mechanism of action consists of an oxidoreduction reaction with the release of free radicals. The great instability of radicals, when in contact with the tissues, promotes oxidation and reduction in the size of the pigment chains incorporated into them. These pigments are eventually broken down into smaller and smaller molecular chains and end up being diffused from the dental structure. In turn, the use of enzymes aimed at tooth whitening can be a less harmful alternative to the tooth because their specificity regarding the substrate makes them of great interest to perform specific reactions, reducing collateral effects. The use of proteolytic enzymes and oxidoreductases paired with the application of peroxides, can be a promising alternative for obtaining even better results in the dental bleaching process.


Subject(s)
Enzymes/analysis , Tooth Bleaching Agents/analysis , Oxidoreductases/administration & dosage , Tooth , Dentistry/classification , Literature
11.
Braz. j. oral sci ; 20: e219320, jan.-dez. 2021. ilus
Article in English | BBO, LILACS | ID: biblio-1253013

ABSTRACT

Aim: This study analyzed the effect of whitening mouth rinses on water sorption (WS), solubility (SL), color change, and surface roughness of a nanofilled composite. Whitening perceptibility and acceptability (WID) were also studied. Methods: Forty specimens of Filtek Z350XT, shade EA2 were produced and randomly distributed (n=8) to AS ­ artificial saliva (control); LWE ­ Listerine Whitening Extreme; CLW ­ Colgate Luminous White; LCM ­ Listerine Cool Mint; and CP ­ Colgate Plax. They were immersed in the mouth rinses 2x/day, for one minute, during 28 days. The color was assessed using an Easyshade spectrophotometer (CIE-L*a*b* system). Surface roughness (Ra-µm) was measured with three parallel measures, using an RP-200 roughness meter. The WS and SL (µg/mm-3) were analyzed based on the ISO 4049 recommendations. The data were analyzed using one- and two-way ANOVA/Tukey tests (α=0.05). Results: Surface roughness significantly increased after immersion in AS and LCM, with no significant differences between the groups either before or after immersion. The ΔE* was not significantly different between the groups. All substances produced a ΔWID higher than the 50%:50% perceptibility and acceptability thresholds. The WS and SL were not significantly affected by the mouth rinses. Conclusion: Whitening mouth rinses did not affect WS, SL, surface roughness, and color stability of a nanofilled composite, regardless of the presence of ethanol in the composition


Subject(s)
Color , Composite Resins , Nonprescription Drugs , Tooth Bleaching Agents , Mouthwashes
12.
Braz. j. oral sci ; 20: e211711, jan.-dez. 2021. tab
Article in English | BBO, LILACS | ID: biblio-1253790

ABSTRACT

Aim: The present study aimed to investigate if the Guatemalan dentist's options on tooth bleaching could be influenced by their time in clinical practice, the level of specialization or their working place. Methods: A representative sample of dentists working in clinical practice in Guatemala was selected. Data were collected using a self-administered questionnaire with information related to gender, professional characteristics (time since graduation in years and working place) and preferences regarding vital (at-home or in-office; type and concentration of bleaching agent) and the nonvital tooth bleaching (bleaching agent used). The analysis was performed and the association between preference for bleaching technique and independent variables were investigated using Fisher's exact test. Results: 200 dentists were interviewed. More than half of dentists were male (57.0%) with time since graduation between 11 and 20 years (n= 64; 32.3%). Dentists mostly (60.5%) preferred in-office technique for vital bleaching, with 10-20% Carbamide peroxide (CP) as the preferred agent (50%). For nonvital teeth, the preferred agent (46.8%) was 37% Hydrogen Peroxide (HP). About the associations, younger dentists (< 20 years of graduation) selected mostly in-office technique, while those with more than 20 years indicated more the at-home technique. Also, the dentists working in private practice chose more frequently in-office technique. Thus, the in-office technique was more popular among Guatemalan dentists, with 10-20% CP and 37% HP selected as favorite bleaching agents for vital and nonvital techniques, respectively. Conclusion: The time of clinical practice and working place influenced some choices


Subject(s)
Humans , Male , Female , Cross-Sectional Studies , Surveys and Questionnaires , Practice Patterns, Dentists' , Tooth Bleaching Agents
13.
Int. j. odontostomatol. (Print) ; 15(3): 586-594, sept. 2021. tab, ilus, graf
Article in English | LILACS | ID: biblio-1385811

ABSTRACT

The objective of this in vitro study was to assess the effects of two antioxidants (sodium ascorbate [SA] and alpha-tocopherol [AT]) on the adhesive interface and dentin bond strength immediately after bleaching with 38 % hydrogen peroxide (38HP) in endodontically-treated teeth. Two stages of experimentation were carried out. Bovine incisors were allocated into four groups (n = 10/group for each experiment): NB, non-bleached restored crowns; 38HP, bleached and immediately restored crowns; 38HP-SA, bleached crowns and SA use; and 38HP-AT, bleached crowns and AT use. Hybrid layer length in dentin (μm) and bond strength (MPa) were assessed with confocal microscopy laser and micro-shear bond strength (μSBS) test, respectively. Failure mode was determined by stereomicroscope. Data analysis was performed with analysis of variance (ANOVA) and Kruskal-Wallis, Dunn, Tukey, and Fisher-exact tests (a = 0.05). Higher values of hybrid layer length were observed similarly in the NB and 38HP-SA groups. The highest μSBS mean values were observed in the NB group (18 .51 ? 1.33), whereas the SBS values for 38HP-AT (1.68 ? 0.32) were similar to the 38HP group (1.61 ? 0.51) (p > 0.05) and significantly lower than the 38HP-SA group (5.78 ? 0.71). Adhesive failures were predominant in the 38HP and 38HP-AT groups. Cohesive and mixed failures were mostly observed in the NB and 38HP-SA groups, respectively. In conclusion, AT has no immediate effect on the hybrid layer formation and μSBS of dentin. Although SA promotes an increase in hybrid layer formation, it was not reflected in the μSBS values.


El objetivo de este estudio in vitro fue evaluar los efectos de dos antioxidantes (ascorbato de sodio [AS] y alfa-tocoferol [AT]) sobre la interfaz adhesiva y la fuerza de unión de la dentina inmediatamente después del blanqueamiento con peróxido de hidrógeno al 38 % (38HP) en endodoncia. -Dientes tratados. Se llevaron a cabo dos etapas de experimentación. Los incisivos bovinos se dividieron en cuatro grupos (n = 10 / grupo para cada experimento): NB, coronas restauradas no blanqueadas; 38HP, coronas blanqueadas y restauradas inmediatamente; 38HP- AS, coronas blanqueadas y uso SA; y 38HP-AT, coronas blanqueadas y uso de AT. La longitud de la capa híbrida en dentina (μm) y la fuerza de unión (MPa) se evaluaron con láser de microscopía confocal y la prueba de fuerza de unión por micro-cizallamiento (μSBS), respectivamente. El modo de falla se determinó mediante estereomicroscopio. El análisis de los datos se realizó con análisis de varianza (ANOVA) y pruebas de Kruskal-Wallis, Dunn, Tukey y Fisher (α = 0,05). De manera similar, se observaron valores más altos de longitud de capa híbrida en los grupos NB y 38HP-AS. Los valores medios más altos de μSBS se observaron en el grupo NB (18,51 ? 1,33), mientras que los valores de SBS para 38HP-AT (1,68 ? 0,32) fueron similares a los del grupo 38HP (1,61 ? 0,51) (p> 0,05) y significativamente más bajos que el grupo 38HP-AS (5,78 ? 0,71). Las fallas adhesivas fueron predominantes en los grupos de 38HP y 38HP-AT. Las fallas cohesivas y mixtas se observaron principalmente en los grupos NB y 38HP-AS, respectivamente. En conclusión, la AT no tiene un efecto inmediato sobre la formación de la capa híbrida y el μSBS de dentina. Aunque AS promueve un aumento en la formación de capas híbridas, no se refleja en los valores de μSBS.


Subject(s)
Humans , Ascorbic Acid/therapeutic use , Dental Bonding/methods , alpha-Tocopherol/therapeutic use , Peroxides/therapeutic use , Tooth Bleaching/methods , Dentin-Bonding Agents/therapeutic use , Shear Strength , Dental Stress Analysis , Tooth Bleaching Agents/therapeutic use , Hydrogen Peroxide/therapeutic use
14.
Braz. dent. j ; Braz. dent. j;32(4): 19-30, July-Aug. 2021. tab, graf
Article in English | LILACS, BBO | ID: biblio-1345519

ABSTRACT

Abstract: This study investigated the bleaching effectiveness and the physicochemical effects on enamel of violet light and ozone, associate or not to hydrogen peroxide, compared to 35%-hydrogen peroxide. Enamel-dentin blocks from human molars were randomly allocated to receive one of the following bleaching protocols (n=15): (HP) 35%-hydrogen peroxide, (VL) violet light, (OZ) ozone, the association between hydrogen peroxide with ozone (OZ+HP) or violet light (VL+HP). All protocols were performed in two sessions with a 48h interval. Color (spectrophotometer) and mineral composition (Raman spectroscopy) were measured before and after the bleaching. Color changes were calculated by ΔEab, ΔE00, and whitening index (WI). The surface roughness was measured with an atomic force microscope. Data were analyzed by One-way or Two-way repeated measure ANOVA followed by the Tukey's test (α = 0.05). The lowest color change values (either measured by WI, ΔEab, or ΔE00) were observed for VL and OZ used with no HP. Violet light associate with HP was unable to improve the color changes observed for the peroxide alone, in combination with OZ and HP, the highest color changes were verified. Regardless of bleaching protocol, the bleached enamel presented higher contents of PO4 and CO3 -2 than those observed at baseline. All bleaching protocols resulted in similar enamel surface roughness. Both the VL and the OZ caused reduced effects on the enamel color change when used alone. The ozone therapy improved the bleaching effect in the group that received the association of HP.


Resumo O objetivo deste estudo foi avaliar o efeito clareador e físico-químico no esmalte de luz violeta e ozônio, associado ou não ao peróxido de hidrogênio, comparado a 35% de peróxido de hidrogênio. Blocos de esmalte-dentina de molares humanos foram alocados aleatoriamente para receber um dos seguintes protocolos de clareamento (n = 15): (HP) peróxido de hidrogênio a 35%, (VL) luz violeta, (OZ) ozônio, a associação entre peróxido de hidrogênio com ozônio (HP+OZ) ou luz violeta (HP+VL). Todos os protocolos foram realizados em duas sessões, com intervalo de 48 horas entre eles. A cor (espectrofotômetro) e a composição mineral (espectroscopia Raman) do dente foram medidas antes e após os procedimentos de clareamento. As alterações de cor foram calculadas por ΔEab e ΔE00, e o índice de brancura foram calculados. A rugosidade da superfície das amostras clareadas foi medida por microscópio de força atômica. Os dados foram analisados por ANOVA One way ou ANOVA two way de medidas repetidas seguida pelo teste de Tukey (α = 0,05). Os menores valores de alterações de cor (medidos por WI, ΔEab ou ΔE00) foram observados para VL e OZ usados na ausência de HP. VL associada ao HP não foi capaz de melhorar as alterações de cor observadas com o uso do HP, mas a combinação de OZ e HP produz as maiores alterações de cor. Independentemente do protocolo de clareamento, o esmalte clareado apresentou maiores teores de PO4 e CO3 -2 do que os observados inicialmente. Não foi observada diferença significativa entre os protocolos de clareamento testados em relação à rugosidade da superfície do esmalte. É possível concluir que a VL ou o OZ tiveram efeitos reduzidos na mudança de cor do esmalte quando usados sozinhos. A terapia com OZ melhorou o efeito clareador do HP.


Subject(s)
Humans , Ozone , Tooth Bleaching , Tooth Bleaching Agents , Color , Dental Enamel , Hydrogen Peroxide
15.
RFO UPF ; 26(2): 262-274, 20210808. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1452533

ABSTRACT

Objetivo: Verificar, por meio de uma revisão de literatura, a efetividade do uso do fluoreto de sódio como dessensibilizante para casos de sensibilidade induzida por clareamento dental. Resultados: O clareamento dentário tornou-se um dos procedimentos estéticos mais procurados na odontologia. Atualmente, existem duas técnicas supervisionadas por dentistas: o clareamento caseiro e o de consultório. Os materiais mais utilizados são o peróxido de carbamida e o de hidrogênio, respectivamente. O clareamento dental baseia-se na premissa de que o peróxido de hidrogênio penetra na estrutura dentária para interagir com os cromóforos orgânicos. Embora o protocolo de clareamento exija o uso de agentes oxidantes de baixa concentração, a sensibilidade dentária ainda está presente e pode ser considerado o principal efeito adverso da técnica de clareamento. Para minimizar este problema, a aplicação tópica de dessensibilizantes antes e após o clareamento dentário tem mostrado bons resultados na redução da intensidade de sensibilidade. Considerações finais: Mediante revisão apresentada, constatou-se que fluoreto de sódio quando utilizado após o protocolo clareador, como dessensibilizante, não elimina a sensibilidade, mas diminui a intensidade da dor. Quando utilizado antes do clareamento dental, não apresenta resultados positivos. Ademais, salienta-se que quando o fluoreto é incorporado no gel clareador, resulta em menor desmineralização do esmalte dentário.(AU)


Objective: To verify, through a literature review, the effectiveness of using sodium fluoride as a desensitizer for cases of sensitivity induced by tooth whitening. Literature review: Teeth whitening has become one of the most desired aesthetic procedures in dentistry. Currently, there are two techniques supervised by dentists: home whitening and office whitening. The most used materials are carbamide peroxide and hydrogen peroxide, respectively. Teeth whitening is based on the premise that hydrogen peroxide penetrates the tooth structure to interact with organic chromophores. Although the whitening protocol requires the use of low concentration oxidizing agents, tooth sensitivity is still present and can be considered the main adverse effect of the whitening technique. To minimize this problem, the topical application of desensitizers before and after tooth whitening has shown good results in reducing the intensity of sensitivity. Final considerations: Upon the review presented, it was found that sodium fluoride, when used after the whitening protocol, as a desensitizer, does not eliminate sensitivity, but reduces the intensity of pain. When used before tooth whitening, it has no positive results. Furthermore, it should be noted that when fluoride is incorporated into the whitening gel, less enamel demineralization is induced.(AU)


Subject(s)
Humans , Tooth Bleaching/methods , Sodium Chloride/therapeutic use , Dentin Desensitizing Agents/therapeutic use , Dental Enamel/drug effects , Dentin Sensitivity/prevention & control , Tooth Bleaching Agents/chemistry
16.
Braz. dent. j ; Braz. dent. j;32(3): 105-115, May-June 2021. tab, graf
Article in English | LILACS, BBO | ID: biblio-1345503

ABSTRACT

Abstract This clinical trial evaluated the effect of the coadministration of ibuprofen/caffeine on bleaching-induced tooth sensitivity (TS). A triple-blind, parallel-design, randomized clinical trial was conducted on 84 patients who received ibuprofen/caffeine or placebo capsules. The drugs were administered for 48 hours, starting 1 hour before the in-office bleaching. Two bleaching sessions were performed with 35% hydrogen peroxide gel with 1-week interval. TS was recorded up to 48 hours after dental bleaching with a 0-10 visual analogic scale (VAS) and a 5-point numeric rating scale (NRS). The color was evaluated with VITA Classical and VITA Bleachedguide scales (ΔSGU) and VITA Easyshade spectrophotometer (ΔE*ab and ΔE00). The absolute risk of TS in both groups was evaluated using Fischer's exact test. Comparisons of the TS intensity (NRS and VAS data) were performed by using the Mann-Whitney test and a two-way repeated measures ANOVA, respectively. The color alteration between the groups was compared with the Student's t test. The significance level was 5%. There was no statistically significant difference between the groups for the absolute risk of TS (p = 1.00) or for the intensity of TS (p > 0.05). A bleaching of approximately 7 shade guide units was observed on the Vita Classical and Vita Bleachedguide scales, with no statistical difference between the groups. It was concluded that coadministration of ibuprofen and caffeine did not reduce the absolute risk or intensity of TS and did not interfere with the efficacy of dental bleaching.


Resumo Este ensaio clínico avaliou o efeito da coadministração de ibuprofeno/cafeína na sensibilidade dental decorrente de clareamento (SD). Um estudo clínico randomizado, paralelo, triplo-cego, foi realizado em 84 pacientes que receberam cápsulas de ibuprofeno/cafeína ou placebo. Os fármacos foram administrados por 48 horas, começando 1 hora antes do clareamento em consultório. Duas sessões de clareamento foram realizadas com gel de peróxido de hidrogênio 35% com intervalo de 1 semana. A SD foi registrada até 48 horas após o clareamento dental com uma escala visual analógica (VAS) de 0-10 e uma escala de classificação numérica (NRS) de 5 pontos. A cor foi avaliada com as escalas Vita Classical e Vita Bleachedguide (ΔSGU) e com o espectrômetro Vita Easyshade (ΔE*ab e ΔE00). O risco absoluto de SD em ambos os grupos foi avaliado por meio do teste exato de Fischer. As comparações da intensidade da SD (NRS e VAS) foram realizadas utilizando-se o teste Mann-Whitney e uma ANOVA de dois fatores com medidas repetidas, respectivamente. A alteração de cor entre os grupos foi comparada com a o teste t de Student. O nível de significância foi de 5%. Não houve diferença estatisticamente significante entre os grupos para o risco absoluto de SD (p = 1,00) ou para a intensidade de SD (p > 0,05). Observou-se clareamento de aproximadamente 7 unidades nas escalas Vita Classical e Vita Bleachedguide, sem diferença estatística entre os grupos. Concluiu-se que a coadministração de ibuprofeno e cafeína não reduziu o risco absoluto ou intensidade da SD e não interferiu na eficácia do clareamento dental.


Subject(s)
Humans , Tooth Bleaching , Caffeine/therapeutic use , Ibuprofen/therapeutic use , Dentin Sensitivity/chemically induced , Tooth Bleaching Agents/adverse effects , Treatment Outcome , Hydrogen Peroxide
17.
Int. j interdiscip. dent. (Print) ; 14(1): 17-21, abr. 2021. tab, ilus, graf
Article in Spanish | LILACS | ID: biblio-1385179

ABSTRACT

RESUMEN: Objetivo: Evaluar y comparar el efecto de tres agentes blanqueadores en la resistencia adhesiva al cizallamiento de brackets metálicos. Método: Se cementaron 76 brackets en premolares humanos extraídos por indicación de ortodoncia. Se establecieron 4 grupos: (0) control, (1) esmalte tratado con Peróxido de Carbamida al 16%, (2) Peróxido de Hidrógeno al 35% y (3) tiras de blanqueamiento con Peróxido de Hidrógeno al 10%. Los brackets fueron cementados con Transbond XT (3M Unitek, EE.UU.). Se realizaron 5.000 ciclos de termociclado, luego se evaluó la resistencia adhesiva mediante una máquina Bisco y la cantidad de material adhesivo remanente según el índice adhesivo remanente (ARI). El análisis estadístico incluyó pruebas de Shapiro- Wilk, Kruskal -Wallis y Mann-Whitney. Resultados: Los grupos 0, 1, 2, 3 obtuvieron fuerzas de resistencia de 12.64, 11.06, 6.4 y 9.34 Mpa respectivamente con diferencia estadística entre los grupos (p <0.05). El ARI fue significativamente diferente en algunos grupos (p <0.05), indicando fallas adhesivas para el grupo 2 (p <0.05), cohesivas para el grupo control y de ambos tipos para los grupos 1 y 3. Conclusiones: El peróxido de hidrógeno al 35% reduce la resistencia adhesiva al cizallamiento en brackets metálicos sometidos a termociclado 24 horas luego del blanqueamiento.


ABSTRACT: Aim: To evaluate and compare the effect of three bleaching agents on the shear bond strength of metallic brackets. Method: Brackets were cemented on 76 human premolars extracted for orthodontic reasons. 4 groups were evaluated: (0) Control, (1) enamel treated with Carbamide Peroxide 16%, (2) Hydrogen Peroxide 35% and (3) Hydrogen Peroxide 10% "Whitening strips". All brackets were cemented using Transbond XT adhesive system (3M, Unitek, USA). All samples were thermocycled (5.000 cycles). Shear bond strength was evaluated with a Bisco machine and the amount of adhesive material at the base of the brackets and enamel surface was assessed using the adhesive remnant index (ARI). The statistical analysis included Shapiro-Wilk, Kruskal-Wallis and Mann-Whitney U tests. Results: The results of shear bond strength for groups 0, 1, 2, and 3 were 12.64, 11.06, 6.4 and 9.34 MPa respectively, with statistically significant differences between groups (p <0.05). ARI index was significantly different in some groups (p <0.05), indicating cohesive failure for control, adhesive failure for group 2 (p <0.05), adhesive and cohesive failure for groups 1 and 3. Conclusions: The 35% hydrogen peroxide office bleaching agent reduces adhesion values in the metal brackets thermocycled 24 hours after bleaching.


Subject(s)
Humans , Orthodontic Brackets , Dental Cements , Tooth Bleaching Agents/chemistry , Surface Properties , Bicuspid , Materials Testing , Shear Strength , Dental Stress Analysis
18.
Braz. oral res. (Online) ; 35: e066, 2021. tab, graf
Article in English | LILACS, BBO | ID: biblio-1249366

ABSTRACT

Abstract: This study developed experimental gels containing titanium tetrafluoride (TiF4) combined with commercial 35% hydrogen peroxide (HP), and evaluated bleaching efficacy and pH of the gels, and mineral content and morphology of enamel submitted to these treatments. In phase-1, different stock gels mixed with TiF4 were combined with HP. In phase-2, the selected gels were tested on enamel/dentin specimens (n=8): HP; HP and Natrosol+TiF4 (HPnT); HP and Natrosol+Chemygel+TiF4 (HPncT); HP and Aristoflex+TiF4 (HPaT). Bleaching was performed in four sessions (3x15min-application/session). Color (CIEL*a*b*) and whiteness index (WID) were measured after each session, whereas whiteness index differences (ΔWID), color alteration (CIELab-ΔE, CIEDE2000-ΔE00), enamel morphology and pH, at end of bleaching therapy. The change in Knoop microhardness (ΔKHN) was compared before and after bleaching. Data were analyzed by two-way repeated measures ANOVA and Bonferroni (CIEL*, a*, b*), one-way ANOVA and Tukey (ΔWID, ΔE, ΔE00), and LSD (ΔKHN) tests (α=5%). SEM and pH measurements were submitted to descriptive analysis. No differences were observed in lightness (L*) or WID among the groups (p > 0.05), but HP exhibited lower b* values (p<0.05), higher ΔWID than HPnT, and the highest ΔE among the groups (p < 0.05). No differences in ΔE00 were observed between HP and HPncT (p > 0.05), and HPncT showed higher ΔKHN than HP (p < 0.05). HP presented pH values closer to neutral (6.9), whereas experimental agents showed acidic pH values (2.3-3.9). No morphological changes were observed in HP or HPncT groups. HPncT was able to bleach the enamel and maintain enamel microhardness and surface integrity, even at low pH.


Subject(s)
Tooth Bleaching , Bleaching Agents , Tooth Bleaching Agents , Titanium , Fluorides , Hydrogen Peroxide
19.
Odontoestomatol ; 23(37): e402, 2021. graf
Article in Spanish | LILACS | ID: biblio-1250425

ABSTRACT

Resumen Introducción: El oscurecimiento de un diente anterior interfiere negativamente en el aspecto de la sonrisa, y varias son las causas que pueden ser responsables por este oscurecimiento. Objetivo: Describir las técnicas de blanqueamiento mixto e inmediato a través del reporte de dos casos clínicos. Caso 1: Individuo de sexo masculino, con Síndrome de Treacher Collins, se quejó sobre alteración cromática del diente 33, verificada mediante examen clínico, radiográficamente presencia de tratamiento endodóntico satisfactorio. Por lo que fue planeado el blanqueamiento interno mediante técnica mixta. Caso 2: Individuo de sexo masculino, con Síndrome de Apert reportó cambio cromático en el diente 22, observado en el examen clínico, radiográficamente presentando tratamiento endodóntico insatisfactorio. Se realizó retratamiento endodóntico y a los 6 meses se realizó blanqueamiento interno mediante técnica inmediata. Conclusión: El blanqueamiento dental ejecutado con las técnicas mixtas e inmediatas, devuelve la armonía de la sonrisa, recuperando el color ideal y elevando la autoestima a los pacientes.


Resumo Introdução: O escurecimento de um dente anterior interfere negativamente na aparência do sorriso, e várias são as causas que podem ser responsáveis por esse escurecimento. Objetivo: Descrever as técnicas clareadoras mista e imediata através do relato de dois casos clínicos. Caso 1: Indivíduo do gênero masculino com Síndrome de Treacher Collins, queixou-se de alteração cromática no dente 33, constatado no exame clínico, radiograficamente apresentando tratamento endodôntico satisfatório. O clareamento interno foi planejado e realizado pela técnica mista. Caso 2: Indivíduo do gênero masculino, com Síndrome de Apert, relatou alteração cromática no dente 22, constatado ao exame clínico, apresentando tratamento endodôntico insatisfatório. Foi realizada a reintervenção endodôntica e após 6 meses, foi realizado clareamento interno pela técnica imediata. Conclusão: O uso das técnicas clareadoras mista e imediata, resulta na devolução da harmonia do sorriso, recuperando a coloração ideal e devolvendo a autoestima aos pacientes.


Abstract Introduction: The darkening of a single anterior tooth negatively affects the smile's appearance, and several factors may cause this darkening. Objective: To describe the mixed and immediate bleaching techniques by reporting two clinical cases. Case 1: A male individual with Treacher Collins Syndrome. He complained of chromatic alteration in tooth 33, which was verified on clinical examination. X-ray imaging showed satisfactory endodontic treatment. Internal bleaching was performed with the mixed technique. Case 2: A male individual with Apert Syndrome reported chromatic alteration in tooth 22, observed on clinical examination. X-ray imaging showed unsatisfactory endodontic treatment. Endodontic retreatment was performed. Six months later, internal whitening was performed immediately. Conclusion: The use of mixed and immediate whitening techniques restores the smile's harmony, the tooth's ideal color, and patients' self-esteem.


Subject(s)
Humans , Male , Adult , Young Adult , Tooth Bleaching/methods , Tooth, Nonvital , Cuspid , Tooth Bleaching Agents
20.
Article in English | LILACS, BBO | ID: biblio-1287487

ABSTRACT

ABSTRACT Objective: To assess the 6-month efficacy of natural tooth color change in in-office bleaching treatment in terms of time by using a spectrophotometer. Material and Methods: A total of 20 participants were chairside treated with 40% hydrogen peroxide (HP), three applications each 20 minutes, in one appointment. Instrumental color measurement was performed on six anterior maxillary teeth before bleaching (baseline-t0), immediately after in-office bleaching and rehydration of the teeth (t1), 3 months (t2), and 6 months after bleaching treatment (t3). The spectrophotometer measured the tooth shades based on the CIE L*a*b* color notation system and Bleach index during the period of observation. CIE L*a*b* (ΔEab) color differences were calculated. Results: The color change at t1 was ΔEab = 3.2, at t2 was ΔEab = 1.8, at t3 was ΔEab = 1.2 and overall color change of in-office method was ΔEab = 3.6 (p<0.05). A significant effect for the mean CIEL*a*b* values was detected as within time b* values decreased significantly (p<0.05). Bleach index values significantly decreased during the time of observation, too (p<0.05). Conclusion: The in-office bleaching treatment using 40% hydrogen peroxide was effective, and the results showed a statistically significant decrease in color change during the period of 6-month observation.


Subject(s)
Humans , Male , Female , Adult , Tooth Bleaching , Spectrophotometers , Dental Offices , Tooth Bleaching Agents/chemistry , Hydrogen Peroxide/therapeutic use , Analysis of Variance , Data Interpretation, Statistical , Treatment Outcome , Bosnia and Herzegovina , Statistics, Nonparametric
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