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1.
Braz. oral res. (Online) ; 33: e098, 2019. tab, graf
Article in English | LILACS | ID: biblio-1039306

ABSTRACT

Abstract The aim was to evaluate the effect of 2% grape seed extract (GSE) containing phosphoric acid (PhA) on the bond strength to enamel and dentin. The control group was 37% PhA. The following three PhA formulations with 2% GSE and 20% ethanol were obtained: GSE5 = 5% PhA; GSE10 = 10% PhA; and GSE20 = 20% PhA. The enamel and dentin surfaces of molars were etched with the acid solutions, followed by Scotchbond Multi-Purpose adhesive and composite resin application. The tensile bond strength (TBS) test evaluated the bond to enamel after 24 h, and the microtensile bond strength (μTBS) test evaluated the bond to dentin after 24 h and 12-month water storage. Etched enamel and dentin were observed by scanning electron microscopy (SEM) and atomic force microscopy (AFM), respectively. The TBS data were submitted to one-way ANOVA, while µTBS data were submitted to two-way ANOVA and Tukey's test (α = 0.05). The TBS (MPa) to enamel did not significantly differ among the control (48.1 ± 15.7), GSE5 (46.1 ± 9.6), GSE10 (49.8 ± 13.6) and GSE20 (44.1 ± 11.9) groups (p = 0.537). The µTBS (MPa) to dentin of the control (28.4 ± 14.4) and GSE20 (24.1 ± 8.1) groups were significantly higher than those of the GSE5 (16.8 ± 7.4) and GSE10 (17.5 ± 6.6) groups at 24 h (p < 0.006). After 12-month storage, only GSE5 (21.0 ± 7.8) and GSE10 (17.6 ± 8.0) did not show significantly decreased μTBS (p > 0.145). SEM micrographs showed a shallower enamel etching pattern for GSE5. AFM images showed the formation of collagenous globular structures for GSE5 and GSE10. The different acid solutions did not influence the TBS to enamel, and the µTBS to dentin was stable over time when dentin was etched with GSE5 and GSE10.


Subject(s)
Humans , Adolescent , Adult , Young Adult , Phosphoric Acids/chemistry , Acid Etching, Dental/methods , Dental Bonding/methods , Dental Enamel/drug effects , Dentin/drug effects , Grape Seed Extract/chemistry , Reference Values , Surface Properties/drug effects , Tensile Strength , Time Factors , Materials Testing , Microscopy, Electron, Scanning , Reproducibility of Results , Analysis of Variance , Statistics, Nonparametric , Microscopy, Atomic Force , Dental Enamel/chemistry , Dentin/chemistry
2.
Acta odontol. latinoam ; 32(1): 29-35, 2019. ilus, tab, graf
Article in English | LILACS | ID: biblio-1010419

ABSTRACT

The aim of this study was to evaluate the deproteinization of primary enamel by analyzing etching pattern types, with and without the application of 5% NaOCl before acid etching with 37% H3PO4. Fifteen extracted human primary molars were randomly selected for the present in vitro study; 1mm x 1mm blocks were prepared and divided into two groups (n = 21). These groups were treated as follows: Group AAcid Etching with 37% H3PO4 gel for 15 s; Group B5% NaOCl for 60 s + Acid Etching with 37% H3PO4for 15 s. The specimens were prepared for scanning electron microscopy analysis. The images were evaluated for quality types I and II etching of the enamel surface using ImageJ software. Datasets were checked for normality by KolgomorvSmirnov test and the nonparametric unpaired MannWhitney test was applied. The mean surface area of type I and II etching pattern values was 1922.314 µm2for Group A and 3840.473 µm2Group B. We conclude that deproteinization with 5% NaOCl prior to acid etching can be used to increase the area of adhesion and the quality of the etching pattern (AU)


El objetivo del estudio fue evaluar la desproteinización del esmalte primario a través de los tipos de patrones de grabado, con y sin NaOCl 5% utilizado antes del grabado ácido con H3PO4 37%. Quince dientes primarios humanos extraídos se seleccionaron al azar para el presente estudio in vitro, se prepararon bloques de 1mm x 1 mm y se dividieron en dos grupos (n = 21). Estos grupos se trataron de la siguiente manera: Grupo A: Grabado ácido con H3PO4 37% en gel durante 15 segundos; Grupo B: NaOCl 5% durante 60 segundos + Grabado ácido con H3PO4 37% durante 15 segundos. Las muestras se prepararon para el análisis de microscopía electrónica de barrido. Las imágenes obtenidas se evaluaron principalmente por la calidad de los grabados tipo I y II de la superficie del esmalte primario, utilizando el software Image J. Los datos se analizaron en cuanto a su normalidad mediante la prueba de KolgomorvSmirnov, se utilizó pruebas no paramétricas: Prueba de MannWhitney no pareada. Como resultado, se encontró que el área de superficie media de los valores de patrón de grabado de tipo I y II para el Grupo A era 1922,314 µm2 y el Grupo B era 3840,473 µm2. Finalmente, llegamos a la conclusión de que se puede usar la desproteinización con NaOCl 5% antes del grabado ácido para aumentar el área de adhesión y la calidad del patrón de grabado (AU)


Subject(s)
Humans , Phosphoric Acids , Sodium Hypochlorite , Tooth, Deciduous , Acid Etching, Dental/methods , Dental Enamel/drug effects , Peru , In Vitro Techniques , Microscopy, Electron, Scanning , Data Interpretation, Statistical
3.
Braz. dent. j ; 29(5): 492-499, Sept.-Oct. 2018. tab, graf
Article in English | LILACS | ID: biblio-974174

ABSTRACT

Abstract This study evaluated the effect of different hydrofluoric acid (HF) concentrations on the bond strength between a lithium disilicate-based glass ceramic and a resin cement. Eighty ceramic-blocks (12×7×2 mm) of IPS e.Max CAD (Ivoclar Vivadent) were produced and randomly assigned to 8 groups, considering 2 study factors: HF concentration in 4 levels, i.e., 1% (HF1), 3% (HF3), 5% (HF5), and 10% (HF10), and storage in 2 levels, i.e., baseline (tests were performed 24 h after cementation), and aged (storage for 150 days + 12,000 thermal-cycles at 5°C and 55°C). Acid etching (20 s) was performed, followed by washing, drying, and silanization. Four resin cement cylinders (ϕ= 0.96 mm) were built-up from starch matrices on each ceramic sample (n= 40). Additional ceramic samples were etched and analyzed for contact angle, micro-morphology, and roughness. In baseline condition (without aging), the HF3, HF5, and HF10 groups showed similar bond strength values (13.9 - 15.9 MPa), and HF1 (11.2 MPa) presented lower values than HF5, being that statistically different (p= 0.012). After aging, all the mean bond strengths statistically decreased, being that HF3, HF5, and HF10 (7.8 - 11 MPa) were similar and higher than HF1 (1.8 MPa) (p= 0.0001). For contact angle, HF3, HF5, and HF10 presented similar values (7.8 - 10.4°), lower than HF1 and CTRL groups. HF5 and HF10 presented rougher surfaces than other conditions. For better bond strength results, the tested ceramic may be etched by HF acid in concentrations of 3%, 5%, and 10%.


Resumo Este estudo avaliou o efeito de diferentes concentrações de ácido fluorídrico (HF) na resistência de união entre uma cerâmica vítrea à base de dissilicato de lítio e um cimento resinoso. Oitenta blocos cerâmicos (12×7×2 mm) de IPS e.Max CAD (Ivoclar Vivadent) foram produzidos e distribuídos aleatoriamente em 8 grupos, considerando 2 fatores de estudo: concentração de HF em 4 níveis, isto é, 1% (HF1), 3% (HF3), 5% (HF5), e 10% (HF10), e armazenamento em 2 níveis, isto é, condição inicial (testes foram realizados 24 h após a cimentação), e envelhecidos (150 dias de armazenamento + 12.000 ciclos térmicos a 5°C e 55°C). Condicionamento ácido (20 s) foi realizado, seguido por lavagem, secagem e silanização. Quatro cilindros de cimento resinoso (ϕ= 0.96 mm) foram construídos a partir de matrizes de amido em cada amostra cerâmica (n= 40). Amostras cerâmicas adicionais foram condicionadas e analisadas quanto ao ângulo de contato, micro-morfologia e rugosidade. Na condição inicial (sem envelhecimento), os grupos HF3, HF5, e HF10 mostraram valores de resistência de união similares (13.9 - 15.9 MPa), e HF1 apresentou valores menores que HF5, sendo estatisticamente diferente (p= 0.012). Após o envelhecimento, todas as médias de resistência de união diminuíram estatisticamente, sendo que HF3, HF5 e HF10 foram similares e maiores que HF1 (p= 0.0001). Para o ângulo de contato, HF3, HF5 e HF10 apresentaram valores similares (7.8 - 10.4°), menores que os grupos HF1 e CTRL. HF5 e HF10 apresentaram superfícies mais rugosas que as outras condições. Para melhores resultados de resistência de união, a cerâmica testada pode ser condicionada com ácido fluorídrico nas concentrações de 3%, 5% e 10%.


Subject(s)
Acid Etching, Dental/methods , Ceramics/chemistry , Dental Bonding/methods , Resin Cements/chemistry , Dental Porcelain/chemistry , Hydrofluoric Acid/chemistry , Stress, Mechanical , Surface Properties , Materials Testing , Microscopy, Atomic Force , Shear Strength
4.
Braz. oral res. (Online) ; 32: e102, 2018. tab, graf
Article in English | LILACS | ID: biblio-974459

ABSTRACT

Abstract The aim of this study was to evaluate the effect of ethanol on the bond longevity of a universal adhesive system to bovine dentin, under different modes of adhesive application and artificial aging. Bovine dentin was exposed, and the smear layer was standardized by sandpaper polishing. Specimens were randomly divided into 2 groups: ethanol (E) and non-ethanol (N). Groups were subdivided according to adhesive mode of application into etch-and-rinse (Er) and self-etching (S). Resin blocks were built onto the treated surface, and the specimens were stored in deionized water at 37°C for 48 h. Half of the specimens (n = 10) were subjected to thermomechanical aging (A for aged and Na for non-aged). Resin/dentin beams were obtained and subjected to microtensile test in a universal testing machine. Data were analyzed using a three-way ANOVA and Tukey's tests (α = 5%). There was interaction among the three factors (p=0.0003). The use of ethanol resulted in higher values, except for the Er and Na groups (E_Er_Na = N_Er_Na). The mode of application was similar, except for the N and A groups (N_S_A > N_Er_A). For the A groups, the values were lower, except in the cases using ethanol, in which the results were not affected. The study concluded that the use of ethanol resulted in higher microtensile bond strength values, even after aging. The mode of adhesive application did not influence the results.


Subject(s)
Animals , Cattle , Dental Bonding/methods , Dentin-Bonding Agents/analysis , Resin Cements/chemistry , Dentin/drug effects , Dentin/chemistry , Ethanol/chemistry , Reference Values , Surface Properties , Temperature , Tensile Strength , Time Factors , Acid Etching, Dental/methods , Materials Testing , Reproducibility of Results , Collagen/chemistry , Smear Layer
5.
Braz. oral res. (Online) ; 32: e58, 2018. tab, graf
Article in English | LILACS | ID: biblio-952156

ABSTRACT

Abstract The objective of the present study was to evaluate the effect of different surface treatments and polymerization protocols on the bond strength of brackets to enamel, and the degree of conversion of the bonding agents. 120 bovine crowns were embedded in acrylic resin blocks and sanded. Next, the blocks were randomly assigned into 12 groups. Metal brackets were bonded to enamel according to the "surface treatment" factor (A: Phosphoric Acid; ATxt: Phosphoric Acid + Transbond XT Primer®; Tse: Transbond Plus Self Etching Primer®; and SBU: Scotchbond Universal®) and "polymerization" factor (R20: Radii-Cal®/20 seconds; V20: Valo Cordless®/20 seconds; and V3: Valo Cordless®/3 seconds). All samples were stored for 6 months (water, 37ºC) and then subjected to a shear bond strength test (SBS). Bond failures were classified according to the Adhesive Remnant Index (ARI) and analyzed with the Kruskal-Wallis and Mann-Whitney tests (5%). Using the same factors, 120 resin discs were made to assess the degree of conversion (DC) of the monomer. Data from the SBS (MPa) and DC (%) were analyzed by analysis of variance (2 factors) and Tukey's test (5%). For the SBS, the factors "polymerization" (R20 = 8.1B; V20 = 13.2A; V3 = 5.2C, p = 0.0001) and "surface treatment" (A = 3.1C; ATxt = 13.6A; Tse = 12.3A; SBU = 6.3B, p = 0.0001) were statistically significant among groups. The highest adhesion value were found for the ATxt/V20 group (22.2A) and the lowest value for the A/R20 group (1.2E). Regarding ARI, score 2 was the most prevalent in groups A, ATxt, V20 and V3, while score 4 was the most prevalent in the Tse, SBU and R20 groups, with no significant difference between them (p = 1.0). Regarding DC, the factors "polymerization" (R20 = 66.6A; V20 = 58.4B; V3 = 45.1C, p = 0.0001) and "surface treatment" (A = 52B, ATxt = 59.7A, Tse = 51.4B, SBU = 63.8A, p = 0.0001) were statistically significant. Tse was more sensitive to the variations in polymerization protocols than the other surface treatments. Treatment A did not present suitable bond strength or degree of conversion.


Subject(s)
Animals , Cattle , Orthodontic Brackets , Resin Cements/chemistry , Dental Enamel/drug effects , Self-Curing of Dental Resins/methods , Light-Curing of Dental Adhesives/methods , Polymerization/drug effects , Phosphoric Acids/chemistry , Reference Values , Time Factors , Acid Etching, Dental/methods , Materials Testing , Random Allocation , Adhesiveness/drug effects , Reproducibility of Results , Analysis of Variance , Dental Enamel/chemistry , Shear Strength , Phase Transition , Curing Lights, Dental
6.
J. appl. oral sci ; 25(4): 367-373, July-Aug. 2017. tab, graf
Article in English | LILACS, BBO | ID: biblio-893633

ABSTRACT

Abstract In Dentistry, restorative materials and oral bacteria are believed to be responsible for restoration failure. To make long-lasting restorations, antibacterial agents should be made. Inorganic nanoparticles and their nano composites are applied as good antibacterial agents. Objective The purpose of this study was to investigate the effect of silver nanoparticles on composite shear bond strength using one etch and rinse and one self-etch adhesive systems. Material and Methods Silver nanoparticles were prepared. Transmission electron microscope and X-ray diffraction were used to characterize the structure of the particles. Nanoparticles were applied on exposed dentin and then different adhesives and composites were applied. All samples were tested by universal testing machine and shear bond strength was assesed. Results Particles with average diameter of about 20 nm and spherical shape were found. Moreover, it was shown that pretreatment by silver nanoparticles enhanced shear bond strength in both etch and rinse, and in self-etch adhesive systems (p≤0.05). Conclusions Considering the positive antibacterial effects of silver nanoparticles, using them is recommended in restorative dentistry. It seems that silver nanoparticles could have positive effects on bond strength of both etch-and-rinse and self-etch adhesive systems. The best results of silver nanoparticles have been achieved with Adper Single Bond and before acid etching.


Subject(s)
Humans , Silver/chemistry , Dental Bonding/methods , Resin Cements/chemistry , Dental Cements/chemistry , Dentin/drug effects , Metal Nanoparticles/chemistry , Reference Values , Silver/pharmacology , Surface Properties/drug effects , Acid Etching, Dental/methods , X-Ray Diffraction/methods , Materials Testing , Reproducibility of Results , Analysis of Variance , Shear Strength/drug effects , Dentin/chemistry , Microscopy, Electron, Transmission/methods , Anti-Bacterial Agents/chemistry
7.
Rev. Soc. Odontol. La Plata ; 27(53): 17-23, mayo 2017. ilus, tab, graf
Article in Spanish | LILACS | ID: biblio-869516

ABSTRACT

Los medios de fijación a base de resinas compuestas para cementado, no son más que una resina compuesta fluida, que contiene un menor porcentaje de relleno inorgánico. Es por esto que en la actualidad, algunos autores plantean el uso de resina compuesta de restauración como medio de fijación de restauraciones indirectas (inlay fabricado en cerómero). Dicha resina debe ser fluidificada con calor (50ºC), para posteriormente ser fotoactivada por un tiempo adecuado. Asimismo, como se trata de un material cuya reacción de polimerización sólo es activada por luz, surge la pregunta de si será capaz de ser fotoactivada eficazmente como para polimerizar correctamente, en especial en las zonas más profundas de la preparación cavitaria. El presente estudio busca analizar si existen diferencias en el grado de sellado marginal y en la profundidad de curado de restauraciones cementadas con un medio de fijación a base de resina, previa técnica de grabado y colocación de adhesivo y con una resina compuesta a través de la técnica fluidificada.


The fixing means based on composite resins for cementing, are nothing more than a fluid composite resin, which contains a lower percentage of inorganic filler. This is why, at present, some authors propose the use of composite resin restoration as a means of fixing indirect restorations (inlay made of ceramics). Said resin must be fluidized with heat (50 ° C), to be photoactivated for a suitable time. Also, since it is a material whose polymerization reaction is only activated by light, the question arises whether it will be able to be effectively photoactivated to properly polymerize, especially in the deeper areas of the cavity preparation. The present study aims to analyze if there are differences in the degree of marginal sealing and in the depth of cure of cemented restorations with a resin-based fixing medium, prior to etching and adhesive placement and with a composite resin through the fluidized technique.


Subject(s)
Cementation/instrumentation , Inlays , Composite Resins/chemistry , Acid Etching, Dental/methods , Light-Curing of Dental Adhesives , Materials Testing , Resins, Synthetic/chemistry
8.
Rev. ADM ; 74(2): 79-89, mar.-abr. 2017. ilus
Article in Spanish | LILACS | ID: biblio-869358

ABSTRACT

Utilizar esta técnica implica grandes ventajas, ya que se reduce el volumen de cemento de resina, lo que disminuye la probabilidad de contracción, formación de burbujas y vacíos internos, los cuales representanáreas de debilidad en la restauración postendodóncica. Esta técnica ya ha sido propuesta y debidamente investigada por algunos autores. Se aplica en dientes con conductos radiculares amplios que han sido debilitados por restauraciones defi cientes, desmineralización de la dentina, fi ltraciones en la corona y poste radicular o simplementeconductos amplios en pacientes de corta edad. Tenemos la firme convicciónde que no podemos garantizar la permanencia de un órgano dentalen la cavidad oral, pero sí podemos intentar prolongar su permanenciaen el alvéolo el mayor tiempo posible. La técnica que se describe en elpresente artículo consiste en colocar postes accesorios de fi bra de vidriodespués del poste principal, logrando reducir el espesor de película delagente cementante a un grado ideal.


The use of this technique, shows significant advantages, as the thicknessof the resin cement is reduced, in consequence, the contraction ratio,bubble formation, and internal voids are reduced, which represent areasof weakness in the post-endodontic restoration, this technique has beenalready proposed and properly investigated by certain authors. Thisis applied on teeth with enlarged canals, that have been weakened byineffi cient restorations, dentin demineralization, bacterial fi ltration ofcrown and post, or simply wide canals in young patients. We have afi rm conviction, that we can´t guarantee the permanence of a dentalorgan in the oral cavity, but we can try to lengthen its permanency onthe alveolus as much as possible. The technique that´s described in thisarticle, consists in placing accessory posts of fi ber glass after placingthe main post, achieving a reduction of the cement fi lm thickness toideal thicknesses.


Subject(s)
Humans , Female , Young Adult , Cementation/methods , Glass , Post and Core Technique , Root Canal Therapy/standards , Phosphoric Acids/chemistry , Glass Ionomer Cements/chemistry , Acid Etching, Dental/methods , Dental Bonding/methods , Composite Resins/chemistry , Tensile Strength
9.
Pesqui. bras. odontopediatria clín. integr ; 17(1): e2918, 13/01/2017. tab, graf
Article in English | LILACS, BBO | ID: biblio-914287

ABSTRACT

Objective: To compare the bond strength of three-step and self-etch adhesive systems with and without prior acid etching on bonding of fiberglass posts in root canals. Material and Methods: Experiments were conducted on roots of five upper molars without curvature and sectioned in a cervical-apical direction. With the aid of a highspeed turbine and diamond tips, cylindrical cavities 7 mm in depth and 1.4 mm in diameter were made in the dentine. The roots of the same tooth were used, where the retainers were cemented, thus generating three groups: Group A: Adper Scotchbond Multipurpose Plus (SBMP) + Rely X ARC; Group B: Single Bond Universal (SBU-1) + Rely X ARC, with acid etching prior to adhesive insertion; Group C: Single Bond Universal (SBU-2) + Rely X ARC. The samples were stored in a bacteriological incubator at 37ºC with 100% humidity for 48h and were subsequently cross-sectioned to obtain 3 dentine discs 1mm in thickness. Forty-five specimens were subjected to the push-out test. Results: Through the analysis of variance and Tukey's test, it was found that SBMP showed, with statistical significance (p<0.05), highest bond strength when compared with the SBU-1 and SBU-2 systems. The observed difference in the discs was located in the cervical portion. Conclusion: The three-step adhesive system had higher bond strength with the substrate than the self-etching adhesive only in the disc in the cervical portion; further, statistically, the prior application of phosphoric acid in SBU-1 did not affect its bond strength significantly.


Subject(s)
Acid Etching, Dental/methods , Dental Cements , Glass Ionomer Cements/chemistry , Tensile Strength , Analysis of Variance , Brazil , Dental Pins
10.
Bauru; s.n; 2017. 125 p. ilus, tab, graf.
Thesis in Portuguese | LILACS, BBO | ID: biblio-879882

ABSTRACT

Este estudo teve o objetivo de comparar os efeitos da biomodificação radicular por ácido cítrico associado à tetraciclina (AC) ou terapia fotodinâmica antimicrobiana (aPDT) no recobrimento de recessões gengivais pela técnica do enxerto de tecido conjuntivo subepitelial (ETCS). Para o estudo paralelo foram selecionados 60 sítios em 17 pacientes com recessões de classe I e II de Miller de 2 a 5 mm, múltiplas e isoladas, as quais foram divididas em 3 grupos: grupo controle (C) - apenas raspagem, grupo AC ­ raspagem e, aplicação de gel de ácido cítrico associado à tetraciclina (90s) e o grupo aPDT - raspagem e aplicação da terapia fotodinâmica antimicrobiana (Azul de toluidina O 100µg/ml + laser vermelho). Os parâmetros clínicos profundidade de sondagem (PS), nível clínico de inserção (NCI), altura da recessão (AR), largura mucosa ceratinizada (LMC), espessura de mucosa ceratinizada (EMC), índice de sangramento à sondagem (ISS), índice de placa (IPI) e porcentagem de recobrimento radicular (%REC) foram avaliados por um examinador cego e calibrado no baseline e 3, 6 e 12 meses de pós-operatório. Avaliou-se a hiperestesia dentinária (HIPER) e a percepção estética (EST) do paciente através de escala analógica visual no baseline e após 7 e 14 dias e 1, 3, 6 e 12 meses. A análise estatística dos dados de NCI foi feita pelo teste ANOVA complementado por Tukey. O teste de Friedman complementado por Wilcoxon foi aplicado para análise intra-grupos. O teste de Kruskal-Wallis foi aplicado para as diferenças entre os grupos, complementado por comparações múltiplas entre os três grupos. Para a %REC foi realizado o teste de Kruskal-Wallis complementado por Dunnet (p<0,05). Observou-se ganho do NCI em todos os grupos, mas este ganho foi maior para os grupos AC (0,55±1,68) e aPDT (0,80±2,11) em relação ao C (2,50±1,99) (p<0,05). Houve redução na AR em todos os grupos, porém o grupo AC (0,40±0,62) teve maior redução quando comparado C (1,15±1,04) (p<0,05). Houve aumento na LMC em todos os grupos e aumento na EMC também em todos os grupos, sendo que a EMC nos grupos aPDT (2,80±0,733) e AC (2,33±0,60) foram iguais com melhores resultados que o C (1,99±0,65) (p<0,05). Para a PS não foram observadas diferenças significantes entre os grupos e nem entre os períodos (p>0,05). A %REC foi maior nos grupos AC (82%±30%) e aPDT (82%±28%) do que no grupo C (58%±40%) (p<0,05). De maneira geral C, AC e aPDT foram semelhantes entre si e entre eles ao longo do tempo para o ISS e IPI (p>0,05). Houve redução significante da HIPER ao longo do tempo e entre os grupos, sendo que em AC (1,20±2,23) e aPDT (0,70±1,15) a diminuição da sensibilidade foi maior do que em C (2,63±2,22) (p<0,05). Houve melhora na EST ao longo do tempo e para o grupo AC (9,40±0,96) foi maior do que o C (8,58±1,07) (p<0,05), sendo que o grupo aPDT foi igual ao C. Concluiu-se que o uso de biomodificadores radiculares, como o AC e aPDT favorecem o recobrimento de recessões, resultando em redução da hipersensibilidade dentinária, maior porcentagem de recobrimento radicular e mais sítios com recobrimento completo, mantendo os resultados a longo prazo. (AU)


The aim of this study was to compare root biomodification by a combination of citric acid with tetracycline (CA) or antimicrobial photodynamic therapy (aPDT) on root coverage by subepithelial connective tissue graft (SCTG). Sixty sites with Miller's class I or II recessions were divided in three groups: Control (C) ­ scaling only, CA ­ scaling and root conditioning with a combination of citric acid and tetracycline (gel ­ 90s), aPDT ­ scaling and antimicrobial photodynamic therapy (toluidine blue O 100 µg/ml and red laser). Periodontal clinical parameters as probing depth (PD), clinical attachment level (CAL), recession height (RH), keratinized mucosa height (KMH), keratinized mucosa width (KMW), bleeding on probing (BOP), plaque index (PI) and percentage of root coverage (%RC) were evaluated by a blinded calibrated examiner at baseline, 3, 6, 12 months. Dentinal hyperestesia (HYPER) and patient esthetic perception (EST) were recorded in a visual analogic scale at baseline, 7 and 14 days, 1, 3, 6,and 12 months. Statistical analysis of CAL values was done with ANOVA complemented by Tukey. Friedman's complemented by Wilcoxon's test evaluated intragroup data, while Kruskal-Wallis was applied for intergroup data. Comparison for %RC was done by Kruskal-Wallis complemented by Dunnet (p<0.05). Reduction in CAL was observed in all groups, with higher numbers for CA (0.55±1.68) and aPDT (0.80±2.11) in relation to C (2.50±1.99) (p<0.05). A higher reduction in RH was observed for CA (0.40±0.62) compared to C (1.15±1.04) (p<0.05). There was an improvement of KMH and KMW for all groups, but with higher values of KMW for aPDT (2.80±0.733) and CA (2.33±0.60) in relation to C (1.99±0.65) (p<0.05). There were no differences for PD (p>0.05). There was a significant higher %RC for CA (82%±30%) and aPDT (82%±28%) in relation to C (58%±40%) (p<0.05). In general, BOP and PI were similar for all groups and periods (p>0.05). There was a significant reduction in hyperestesia along time, but for CA (1.20±2.23) and aPDT (0.70±1.15) the reduction was higher than C (2.63±2.22) (p<0.05). Esthetic perception was improved along time with higher values for CA (9.40±0.96) than C (9.40±0.96) (p<0.05). In conclusion, root biomodification agents as CA and aPDT favored recession coverage by STCG, resulting in reduction of dentin hypersensitivity, higher percentage of root coverage and more sites with total coverage. Additionally, these results had a long-term stability. (AU)


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Acid Etching, Dental/methods , Anti-Bacterial Agents/therapeutic use , Gingival Recession/surgery , Gingivoplasty/methods , Photochemotherapy/methods , Tetracycline/therapeutic use , Tooth Root/drug effects , Analysis of Variance , Dental Plaque Index , Gingiva/transplantation , Reproducibility of Results , Statistics, Nonparametric , Time Factors , Treatment Outcome
11.
Braz. oral res. (Online) ; 31: e29, 2017. tab, graf
Article in English | LILACS | ID: biblio-839514

ABSTRACT

Abstract This study evaluates the influence of root dentin treatment with NaOCl alone and combined with EDTA, with and without ultrasound activation, on the push-out bond strength (BS) of fiber-reinforced posts in weakened roots, cemented with RelyX or Panavia. The root canals of 42 maxillary canines were instrumented with Reciproc and 2.5% NaOCl. In the coronal 12mm of all canals, experimental weakening of the roots was produced by reducing dentin thickness with 2.44mm diameter diamond burs. The roots were assigned to 3 groups (n = 14) according to root dentin treatment: 2.5% NaOCl; 2.5% NaOCl + 17% EDTA; and 2.5% NaOCl + 17% EDTA, with solutions agitated using passive ultrasonic irrigation. After cementation of the fiber-reinforced posts the roots were divided in thirds. The first slice of each third was used for the push-out BS test, the second slice for confocal laser scanning microscopy and dentin microhardness (Knoop) analysis. Data were analysed by a two-way ANOVA and Tukey test (a = 0.05). NaOCl + EDTA provided highest BS values than NaOCl (p < 0.0001). Specimens cemented with Panavia presented significantly higher BS than those with RelyX in the three root thirds (p < 0.0001). The highest BS values occurred in the cervical third (p < 0.001). Ultrasound-activated NaOCl + EDTA promoted the greatest reduction in dentin microhardness, followed by NaOCl/EDTA and NaOCl. Ultrasonic activation of NaOCl and EDTA reduced root dentin microhardness, but did not improve the push-out BS of resin-based cements. Panavia presented higher BS than RelyX. RelyX was not influenced by the root dentin treatment protocols.


Subject(s)
Humans , Dental Bonding/methods , Dentin/drug effects , Edetic Acid/chemistry , Resin Cements/chemistry , Sodium Hypochlorite/chemistry , Tooth Root/drug effects , Acid Etching, Dental/methods , Analysis of Variance , Dental Restoration Failure , Dentin/radiation effects , Hardness Tests , Materials Testing , Microscopy, Confocal , Post and Core Technique , Random Allocation , Reference Values , Reproducibility of Results , Root Canal Irrigants/chemistry , Root Canal Preparation/methods , Statistics, Nonparametric , Surface Properties/drug effects , Tooth Root/radiation effects , Ultrasonic Therapy
13.
Rev. Asoc. Odontol. Argent ; 104(4): 150-159, oct.-dic. 2016. ilus, tab
Article in Spanish | LILACS | ID: biblio-869379

ABSTRACT

Objetivo: evaluar el torque de remoción de tres implantes con superficies diferentes, a los 60 días de inserción. Materiales y métodos: se midió la frecuencia de resonancia inicial y final y torque de remoción a los 60 días en 18 implantes: Biomet 3i (Palm Beach Gardens, FL, Estados Unidos); n=6; B&W (Buenos Aires, Argentina), n=6; Tree-Oss (Buenos Aires, Argentina), n=6; todos de 8,5 mm de longitud y 4 mm de diámetro. Los datos fueron sometidos al test no paramétrico de Mann-Whitney, al de Kruskal-Wallis y al de Wilcoxon. Resultados: la media de torque de remoción fue de 82,58 Ncm para implantes Biomet 3i; de 78,08 Ncm para B6W; y de 69 Ncm para Tree-Oss, sin diferencias estadísticamente significativas (p=0,220). La media de ISQ inicial y final fue de 57, 17 y 70,33 para Biomet 3i; de 56,33 y 62,07 para B6W y de 58,17 y 54,5 para Tree-Oss. Conclusión: los tres grupos de implantes presentan valores de torque de remoción similares, sin diferencias estadísticamente significativas pero con diferencias significativas en relación a ISQ final.


Aim: to evaluate the removal torque of three implants with different surfaces placed in rabbit femur, 60 days afterinsertion and to compare the implant stability quotient rightafter insertion and 60 days later.Materials and methods: Initial and final resonance frequency analysis and removal torque were measured at day60, in 18 parallel wall implants: Biomet 3i (Palm Beach Gardens, FL, USA), n=6; B&W (Buenos Aires, Argentina), n=6; Tree-Oss (Buenos Aires, Argentina), n=6; of 8.5 mm in lengthand 4 mm in diameter, placed in the femur of 6 rabbits. Datacollected were analyzed by nonparametric Mann-Whitney, Kruskal-Wallis and Wilcoxon tests. Results: The mean removal torques were 82,58 Ncm forBiomet 3i, 78,08 Ncm for B&W and 69 Ncm for Tree-Oss. Differences were not statistically significant (p=0.220). Inassessing initial and final ISQ, the averages obtained for Biomet3i were 57.17 and 70.33, respectively; for B&W 56.33 and62.67, and 58.17 and 54.5 for Tree-Oss. Conclusion: It is concluded that the three groups presented similar removal torque values with no statistically significant differences between them, but there were significant differences in relation to final ISQ.


Subject(s)
Animals , Rabbits , Dental Implantation, Endosseous , Device Removal , Surface Properties , Torque , Acid Etching, Dental/methods , Osseointegration/physiology , Data Interpretation, Statistical
14.
Rev. Fac. Odontol. (B.Aires) ; 31(71): 27-33, jul.-dic. 2016. ilus, tab
Article in Spanish | LILACS | ID: biblio-869418

ABSTRACT

Objetivo: comparar el comportamiento clínico de restauraciones realizadas en piezas primarias con resinas compuestas utilizando un sistema adhesivo universal y un autoacondicionante de un solo frasco, ambos con grabado selectivo a esmalte. Métodos: Estudio experimental. Los datos obtenidos en 39 pacientes (5.47+1.67 años) con una o más piezas primarias vitales con lesiones amelodentinarias en 1 o 2 superficies restauradas con resinas compuestas utilizando Adper™ Easy One (AAG1 n= 66 restauraciones)fueron comparados con los obtenidos en 58 pacientes (5,76+ 1.58 años) utilizando Single Bond Universal 3M/ESPE (AAG2 n=81). En ambos grupos se realizó acondicionamiento del esmalte durante 30” con ácido fosfórico al 37 por ciento, previo a la aplicación de los sistemas adhesivos. Las 147 restauraciones fueron realizadas y evaluadas clínicamente por tres docentes calibrados (Kappa 0.96) en condiciones basales y en 2 controles posteriores (Ryge modificado). Se calcularon porcentajes y promedios de los porcentajes de fracasos de las restauraciones analizando los resultados a través del Test Normal para diferencia de medias. El proyecto fue aprobado por el Comité de Ética de la Facultad de Odontología de la Universidad de Buenos Aires (FOUBA) (120809-5). Resultados: El porcentaje medio de fracasos antes del primer control resultó 7.21 por ciento y 6.25 por ciento (p=0.85) y antes del segundo control 13.89 por ciento y 9.65 por ciento (p=0,50) en AAG1 yAAG2, respectivamente. Conclusión: El comportamiento clínico de las restauraciones realizadas con resinas compuestas utilizando un sistema adhesivo universal y un auto-acondicionante de un solo frasco, ambos con grabado selectivo a esmalte, reveló resultados similaresdurante el período bajo estudio.


Objective: to compare clinical performance of composite restorations placed in primary dentition using an universal adhesive and an onebottleself-etching system, both of them with selective enamel etching. Method: Experimental Design. Data obtained from 39 patients(5.47+1.67 years.) with one or more small and moderate carious lesions in vital deciduous teeth restored with resin composites usingAdper™ Easy One (AAG1 n= 66), were compared with the obtained in 58 patients (5,76+ 1.58 years) using Universal Single Bond3M/ESPE (AAG2 n=81). In both groups enamel was etched with phosphoric acid 37% during 30” prior to the application ofadhesive systems. Composite resin restorations (N=147) were placed and assessed by 3 calibrated operators (Kappa: 0.96) at baselineand after two appointments (Modified Ryge Criteria). Percentages and average of percentages of failures of restorations were calculated.Statistical analysis: Two sample normal test for the difference in means. Project approved by FOUBA Ethics Committee. (120809-5).Results: The average percentage of failures before the first control was 7.21 % and 6.25 % (p=0.85) and before the second control was13.89 % and 9.65% (p=0.50) in AAG1 and AAG2, respectively. Conclusions: In this work clinical performance of compositerestorations using two single components adhesive systems with previous enamel acid conditioning showed similar results during the periodunder study.


Subject(s)
Humans , Male , Female , Infant, Newborn , Infant , Child, Preschool , Dentin-Bonding Agents , Tooth, Deciduous , Acid Etching, Dental/instrumentation , Acid Etching, Dental/methods , Argentina , Phosphoric Acids/chemistry , Dental Enamel , Composite Resins/therapeutic use , Data Interpretation, Statistical
15.
Braz. dent. j ; 27(6): 693-699, Nov.-Dec. 2016. tab, graf
Article in English | LILACS | ID: biblio-828065

ABSTRACT

Abstract Polyetheretherketone (PEEK) is a material suitable for frameworks of fixed dental prostheses. The effect of different surface treatments on the bond strength of PEEK bonded to human dentin was evaluated. One hundred PEEK cylinders (3 mm×3 mm) were divided into five groups according to surface treatment: silica coating, sandblasting with 45 μm Al2O3 particles, etching with 98% sulfuric acid for 5, 30 and for 60 s. These cylinders were luted with resin cement onto 50 human molars. First, each tooth was embedded in epoxy resin and the buccal dentin surface was exposed. Then, two delimited dentin areas (Æ:3 mm) per tooth were etched with 35% phosphoric acid and bonded with a two-step self-priming adhesive system. After the luting procedure the specimens were stored in water (24 h/37 °C). Shear bond strength (SBS) was tested using a universal testing machine (crosshead speed 0.5 mm/min; load cell 50 kgf) and failure types were assessed. Stress data (MPa) were analyzed using the Kruskal-Wallis test. Comparison of the proportions of different failure types was performed using the Bonferroni method (p<0.05). Kruskal-Wallis demonstrated that differences among groups were not significant (p=0.187). Mean SBS were as follows: silica coating, 2.12±1.12 MPa; sandblasting, 2.37±0.86 MPa; sulfuric acid 5 s, 2.28±1.75 MPa; sulfuric acid 30 s, 1.80±0.85 MPa; sulfuric acid 60 s, 1.67±0.94 MPa. Adhesive and mixed failures were predominant in all groups. Both physical and chemical surface treatments produced adhesion between PEEK, resin cement and dentin.


Resumo O poli-éter-éter-cetona (PEEK) é um material indicado para as estruturas de próteses parciais fixas. O efeito de diferentes tratamentos de superfície na resistência de união entre PEEK e dentina humana foi avaliado. Cem cilindros de PEEK (3 mm×3 mm) foram divididos em cinco grupos de acordo com tratamento de superfície: silicatização, jateamento com partículas de Al2O3 45 µm, condicionamento com ácido sulfúrico 98% por 5, 30 e 60 s. Esses cilindros foram cimentados com cimento resinoso em cinquenta molares humanos. Primeiro, cada dente foi incluído em resina epóxica e a superfície dentinária vestibular foi exposta. Depois, duas áreas (Æ:3 mm) em dentina/por dente foram delimitadas, condicionadas com ácido fosfórico a 35% e receberam aplicação de um sistema adesivo de dois passos. Após o procedimento de cimentação, as amostras foram armazenadas em água (24 h/37 °C). A resistência da união ao cisalhamento (SBS) foi testada em uma máquina universal de ensaios (velocidade 0,5 mm/min; célula de carga 50 kgf), e foram avaliados os tipos de falha. Os dados de tensão (MPa) foram analisados pelo teste de Kruskal-Wallis. A comparação das percentagens de diferentes tipos de falha foi realizada utilizando o método de Bonferroni (p<0,05). O teste de Kruskal-Wallis demonstrou que as diferenças entre os grupos não foram significantes (p=0,187). As médias de SBS foram: silicatização, 2,12±1,12 MPa; jateamento, 2,37±0,86 MPa; ácido sulfúrico por 5 s, de 2,28±1,75 MPa; ácido sulfúrico por 30 s, 1,80±0,85 MPa, ácido sulfúrico por 60 s, 1,67±0,94 MPa. Falhas adesivas e mistas foram predominantes em todos os grupos. Ambos tratamentos de superfície, físicos e químicos, promoveram adesão entre PEEK, cimento resinoso e dentina.


Subject(s)
Humans , Acid Etching, Dental/methods , Dental Bonding , Ketones , Polyethylene Glycols , Dental Cements , Dental Stress Analysis , Materials Testing , Microscopy, Electron, Scanning
16.
Braz. dent. j ; 27(6): 734-738, Nov.-Dec. 2016. tab, graf
Article in English | LILACS | ID: biblio-828074

ABSTRACT

Abstract The aim of this study was to evaluate the effect of silanes, thermal cycling and acid etching on the shear bond strength (SBS) of metallic brackets to feldspathic ceramic. Feldspathic ceramic cylinders (Groups 1, 2, 5 and 6) were etched for 60 s with 10% hydrofluoric acid and Groups 3, 4, 7 and 8, without acid etching. Two layers of silane Clearfil Ceramic Primer (CCP, Groups 1 to 4) and two layers of RelyX Ceramic Primer (RCP, groups 5 to 8) were applied and dried for 60 s. Brackets were bonded to the cylinders with Transbond XT and light-activated for 40 s with Bluephase G2. All specimens were stored in deionized water at 37 °C for 24 h, and the specimens of groups 1, 3, 5 and 7 were submitted to 7,000 thermal cycles (5 °C/55 °C). After storage, the SBS test was performed at a crosshead speed of 1 mm/min. Data were subjected to three-way ANOVA and Tukey's post hoc test (α=0.05). The adhesive remnant index (ARI) was evaluated at 8x magnification. The SBS of CCP was significantly greater than of RCP (p<0.05), with or without thermal cycling. Thermal cycling significantly reduced the SBS (p<0.05). The groups submitted to acid etching showed significantly higher SBS than those without acid etching (p<0.05). In conclusion, thermal cycling reduced SBS for all groups. The best ceramic surface treatment for bracket bonding was achieved by acid etching and CCP silane. The ARI results showed predominance of score 0 for all groups.


Resumo O objetivo neste estudo foi avaliar o efeito de diferentes silanos, ciclagem térmica e condicionamento ácido na resistência da união ao cisalhamento (RUC) de bráquetes metálicos a cerâmica feldspática. Cilindros da cerâmica feldspática (Grupos 1, 2, 5 e 6) foram condicionados por 60 s com ácido hidrofluorídrico a 10% e os Grupos 3, 4, 7 e 8 sem condicionamento ácido. Duas camadas do silano Clearfil Ceramic Primer (CCP, Grupos 1 a 4) e duas camadas do RelyX Ceramic Primer (RCP, Grupos 5 a 8) foram aplicadas e secas por 60 s. Bráquetes foram fixados aos cilindros cerâmicos usando Transbond XT e fotoativado por 40 s com Bluephase G2. Todas as amostras foram armazenadas em água deionizada a 37 °C por 24 h, sendo as amostras dos grupos 1, 3, 5 e 7 submetidas a 7.000 ciclos térmicos (5 °C/55 °C). Após a armazenagem, a RUC foi verificada a velocidade de 1 mm/min. Os dados foram submetidos à ANOVA 3 fatores e teste de Tukey post hoc (α=0,05). O Índice de Remanescente do Adesivo (IRA) foi avaliado com aumento de 8x. A RUC do CCP foi significantemente maior do que o RCP (p<0,05), com ou sem ciclagem térmica. A ciclagem térmica reduziu significantemente a RUC (p<0,05). Os grupos submetidos ao condicionamento ácido mostraram valores de RUC significantemente maiores em relação os grupos sem condicionamento ácido (p<0,05). Concluindo, a ciclagem térmica reduziu a RUC para todos os grupos. O melhor tratamento de superfície da cerâmica para colagem de bráquetes foi obtido pelo condicionamento ácido e pelo silano CCP. O IRA mostrou predominância de escore 0 para todos os grupos.


Subject(s)
Acid Etching, Dental/methods , Ceramics , Orthodontic Brackets , Dental Stress Analysis , Metals
17.
Braz. dent. j ; 27(4): 446-451, July-Aug. 2016. tab, graf
Article in English | LILACS | ID: lil-794607

ABSTRACT

Abstract Studies have been showing a decrease of bond strength in dentin treated with sodium hypochlorite (NaOCl). The aim of this study was to evaluate the effect of non-thermal argon plasma on the bond strength of a self-etch adhesive system to dentin exposed to NaOCl. Thirty-two flat dentin surfaces of bovine incisors were immersed in 2.5% NaOCl for 30 min to simulate the irrigation step during endodontic treatment. The specimens were divided into four groups (n=8), according to the surface treatment: Control (without plasma treatment), AR15 (argon plasma for 15 s), AR30 (argon plasma for 30 s) and AR45 (argon plasma for 45 s). For microtensile bond strength test, 5 specimens were used per group. In each group, the specimens were hybridized with a self-etch adhesive system (Clearfil SE Bond) and resin composite buildups were constructed. After 48 h of water storage, specimens were sectioned into sticks (5 per tooth, 25 per group) and subjected to microtensile bond strength test (μTBS) until failure, evaluating failure mode. Three specimens per group were analyzed under FTIR spectroscopy to verify the chemical modifications produced in dentin. μTBS data were analyzed using ANOVA and Tamhane tests (p<0.05). AR30 showed the highest μTBS (20.86±9.0). AR15 (13.81±6.4) and AR45 (11.51±6.8) were statistically similar to control (13.67±8.1). FTIR spectroscopy showed that argon plasma treatment produced chemical modifications in dentin. In conclusion, non-thermal argon plasma treatment for 30 s produced chemical changes in dentin and improved the μTBs of Clearfil SE Bond to NaOCl-treated dentin.


Resumo Estudos vêm demonstrando uma diminuição na resistência adesiva em dentina tratada com hipoclorito de sódio (NaOCl). O objetivo desse estudo foi avaliar o efeito do plasma de argônio não-térmico na resistência de união de um sistema adesivo autocondicionante à dentina exposta ao NaOCl. Trinta e duas superfícies dentinárias lisas de incisivos bovinos foram imersas em NaOCl a 2,5% por 30 min para simular o passo de irrigação durante o tratamento endodôntico. Os espécimes foram divididos em 4 grupos (n=8), de acordo com o tratamento de superfície: Controle (sem tratamento de plasma), AR15 (plasma de argônio por 15 s), AR30 (plasma de argônio por 30 s) e AR45 (plasma de argônio por 45 s). Para teste de resistência de união por microtração, cinco espécimes foram utilizadas por grupo. Em cada grupo, os espécimes foram hibridizados com um sistema adesivo autocondicionante (Clearfil SE Bond, Kuraray) e blocos de resina composta foram construídos. Após 48 h de armazenamento em água, os espécimes foram seccionados em palitos (5 por dente - 25 por grupo) e submetidos ao teste de resistência de união por microtração (μTBS) até a fratura, avaliando o padrão de fratura. Três amostras por grupo foram analisadas sob espectroscopia por FTIR para verificar as modificações químicas produzidas pelos tratamentos na dentina. Os dados de microtração foram avaliados estatisticamente utilizando os testes de ANOVA e Tamhane (p<0,05). AR30 apresentou o maior μTBS (20,86±9,0). AR15 (13,81±6,4) e AR45 (11,51±6,8) foram estatisticamente semelhantes ao controle (13,67±8,1). A espectroscopia por FTIR mostrou que o tratamento de plasma produziu modificações químicas na dentina. Como conclusão, o tratamento de plasma de argônio não-térmico por 30 s produziu alterações químicas na dentina e melhorou o μTBS do Clearfil SE Bond à dentina tratada com NaOCl.


Subject(s)
Acid Etching, Dental/methods , Argon/chemistry , Dentin/chemistry , Plasma Gases , Sodium Hypochlorite/chemistry , Microscopy, Electron, Scanning , Spectroscopy, Fourier Transform Infrared
18.
Int. j. odontostomatol. (Print) ; 10(2): 267-276, ago. 2016. ilus
Article in English | LILACS | ID: lil-794487

ABSTRACT

The objective of this randomized clinical trial was to evaluate the clinical performance up to 18 months of restorations placed using ethanol-wet bonding technique (EWBT) compared with the three-step etch-and-rinse (TSER) and one-step self-etching (OSSE) approaches. Ninety-three non-carious cervical lesions (31 for each group) were restored by one experienced operator in 17 patients under relatively dry conditions using gingival retraction cord, cotton rolls and saliva ejector. Each adhesive system was randomly allocated to one of randomized cervical lesions until the three groups were present in the same subject in equal amounts. The restorations were evaluated at baseline, 6, 12 and 18 months by two blinded and calibrated examiners using the modified US Public Health Service guidelines (USPHS) for the following outcomes: retention (kappa= 1.00), staining and marginal adaptation (kappa=0.81) and analyzed by Fisher's exact and Kruskal-Wallis tests, respectively. No significant differences were observed among groups after 18 months for any of the assessed criteria (p>0.05). The intra-group analysis performed by Cochran's test (for retention) and Wilcoxon test (for marginal adaptation/staining) revealed significant differences between the time intervals baseline/18 months in marginal adaptation (p= 0.0117) and retention (p= 0.0101) for OSSE and in marginal staining for TSER (0.0051) and EWBT (p= 0.0277) groups. The survival analysis for retention criteria and the overall clinical success were performed using a log-rank test and did not show significant differences among groups (p> 0.05). All three adhesives protocols presented similar clinical performance up to 18 months.


El propósito de este ensayo clínico aleatorizado fue evaluar, durante 18 meses, el éxito clínico de las restauraciones realizadas por la técnica de adhesión húmeda en etanol (TAHE) en comparación con las técnicas de grabado independiente de tres pasos (GTP) y de autograbado de un paso (AUP). Un solo operador, especializado en odontología restaurativa, realizó sobre 17 pacientes 93 restauraciones en lesiones cervicales no cariosas (31 para cada grupo). Los diferentes protocolos adhesivos se distribuyeron aleatoriamente en las lesiones cervicales hasta que los tres grupos estuviesen presentes en el mismo paciente y en cantidades iguales. Las restauraciones fueron evaluadas a los 6, 12 y 18 meses, por dos examinadores calibrados y que no participaron del procedimiento restaurador. Las directrices modificadas del Servicio de Salud Pública de Estados Unidos (SSPEU) fueron la base para las evaluaciones de las siguientes variables: retención (kappa= 1,00), adaptación y decoloración marginal (kappa= 0,81). Estas variables fueron analizadas mediante la prueba exacta de Fisher y Kruskal-Wallis, respectivamente. No se observó diferencia significativa entre los grupos después de 18 meses en las tres variables evaluadas (p >0,05). El análisis intra-grupo hecho por la prueba de Cochran (para la retención) y la prueba de Wilcoxon (para la adaptación y decoloración marginal) revelaron diferencias significativas entre los intervalos de tiempo de la línea de base / 18 meses para la retención (p= 0,0101) y adaptación marginal en el grupo AUP (p= 0,0117), y para la decoloración marginal en los grupos GTP (p= 0,0051) e TAHE (p= 0,0277). El análisis de supervivencia para la retención, así como la comparación del éxito clínico de los protocolos adhesivos, fueron realizados con la prueba de log-rank, y no hubo diferencias significativas (p >0,05) entre los grupos. No hubo diferencia en el éxito clínico de los tres protocolos adhesivos después de 18 meses.


Subject(s)
Humans , Male , Female , Dental Bonding/methods , Dentin-Bonding Agents/chemistry , Dental Restoration, Permanent/methods , Ethanol/chemistry , Acid Etching, Dental/methods , Materials Testing , Water , Survival Analysis , Color , Dental Marginal Adaptation , Resin Cements/chemistry , Dentin , Prosthesis Retention
19.
J. appl. oral sci ; 24(4): 344-351, July-Aug. 2016. tab, graf
Article in English | LILACS, BBO | ID: lil-792588

ABSTRACT

ABSTRACT Objectives The aim of this study was to characterise the new hydrophilic fissure sealant, UltraSeal XT® hydro™ (Ultradent Products, USA), and to investigate its in vitro resistance to microleakage after placement on conventionally acid etched and sequentially lased and acid etched molars. Material and Methods The sealant was characterised by Fourier transform infra-red spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and Vickers indentation test. Occlusal surfaces of extracted human molars were either conventionally acid etched (n=10), or sequentially acid etched and laser irradiated (n=10). UltraSeal XT® hydro™ was applied to both groups of teeth which were then subjected to 2,500 thermocycles between 5 and 55°C prior to microleakage assessment by fuchsin dye penetration. Results UltraSeal XT® hydro™ is an acrylate-based sealant that achieved a degree of conversion of 50.6±2.2% and a Vickers microhardness of 24.2±1.5 under standard light curing (1,000 mWcm-2 for 20 s). Fluoride ion release is negligible within a 14-day period. SEM and EDX analyses indicated that the sealant comprises irregular submicron and nano-sized silicon-, barium-, and aluminium-bearing filler phases embedded in a ductile matrix. Laser preconditioning was found to significantly reduce microleakage (Mann-Whitney U test, p<0.001). The lased teeth presented enhanced surface roughness on a 50 to 100 μm scale that caused the segregation and concentration of the filler particles at the enamel-sealant interface. Conclusion Laser preconditioning significantly decreased microleakage and increased enamel surface roughness, which caused zoning of the filler particles at the enamel-sealant interface.


Subject(s)
Humans , Pit and Fissure Sealants/chemistry , Acid Etching, Dental/methods , Composite Resins/chemistry , Dental Enamel/drug effects , Dental Leakage/prevention & control , Spectrometry, X-Ray Emission , Surface Properties/drug effects , Surface Properties/radiation effects , Time Factors , Materials Testing , Microscopy, Electron, Scanning , Reproducibility of Results , Spectroscopy, Fourier Transform Infrared , Statistics, Nonparametric , Dental Enamel/radiation effects , Curing Lights, Dental , Fluorides/chemistry , Hardness Tests , Molar
20.
J. appl. oral sci ; 24(3): 211-217, tab, graf
Article in English | LILACS, BBO | ID: lil-787537

ABSTRACT

ABSTRACT Objective Green tea extract has been advocated as a matrix metalloproteinase (MMP) inhibitor; however, its effect on bond durability to caries-affected dentin has never been reported. Thus, the aim of this in vitro study was to evaluate the effect of two MMP inhibitors (2% chlorhexidine and 2% green tea extract), applied after acid etching, on bond durability of an etch-and-rinse adhesive system to caries-affected dentin. Material and Methods Occlusal enamel was removed from third molars to expose the dentin surface, and the molars were submitted to a caries induction protocol for 15 days. After removal of infected dentin, specimens were conditioned with 37% phosphoric acid (15 seconds) and randomly divided into three groups, according to the type of dentin pretreatment (n=10): NT: no treatment; GT: 2% green tea extract; CLX: 2% chlorhexidine. The etch-and-rinse adhesive system (Adper™ Single Bond 2, 3M ESPE, St. Paul, MN, USA) was applied according to the manufacturer's instructions, and composite resin restorations were built on the dentin. After 24 hours, at 37°C, the resin-tooth blocks were sectioned perpendicularly to the adhesive interface in the form of sticks (0.8 mm2 of adhesive area) and randomly subdivided into two groups according to when they were to be submitted to microtensile bond strength (μTBS) testing: immediately or 6 months after storage in distilled water. Data were reported in MPa and submitted to two-way ANOVA for completely randomized blocks, followed by Tukey’s test (α=0.05). Results After 24 hours, there was no significant difference in the μTBS of the groups. After 6 months, the GT group had significantly higher μTBS values. Conclusion It was concluded that the application of 2% green tea extract was able to increase bond durability of the etch-and-rinse system to dentin. Neither the application of chlorhexidine nor non-treatment (NT - control) had any effect on bond strength after water storage.


Subject(s)
Humans , Phosphoric Acids/chemistry , Tea/chemistry , Chlorhexidine/chemistry , Dental Caries/drug therapy , Dental Cements/chemistry , Dentin/drug effects , Anti-Infective Agents, Local/chemistry , Surface Properties , Tensile Strength , Time Factors , Acid Etching, Dental/methods , Materials Testing , Random Allocation , Reproducibility of Results , Analysis of Variance , Dental Bonding/methods , Dentin-Bonding Agents/chemistry
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