Your browser doesn't support javascript.
Show: 20 | 50 | 100
Results 1 - 8 de 8
Add filters

Year range
Int. j. odontostomatol. (Print) ; 13(3): 305-309, set. 2019. tab
Article in English | LILACS | ID: biblio-1012427


ABSTRACT: The objective evaluate was the influence of prolonged tooth bleaching with 10 % carbamide peroxide (10CP) on tooth enamel mass variation. Ten healthy bovine incisor teeth were divided (n = 5) into G1 - storage in distilled water and G2 - storage in artificial saliva. The samples were weighed in an electronic analytical balance at the following times: T0 - before application of the bleaching gel, T1 - after 14 days of bleaching (the time recommended by the manufacturer), T2 - after 21 days of bleaching (50 % increase in the time recommended by the manufacturer), and T3 - after 28 days of bleaching (100 % increase in the time recommended by the manufacturer). The data were subjected to ANOVA for related samples (p = 0.05). The highest mean was observed in G2 (0.5982 g) and the lowest mean was observed in G1 (0.3074 g) at T2 and T3, respectively. Significant differences were observed between the groups at all times. Overall, 10CP caused variation in the enamel mass after a 100 % increase in the use time recommended by the manufacturer, with a decrease in mass when distilled water was used as the storage medium and an increase when artificial saliva was used.

RESUMEN: El objetivo fue investigar la influencia del blanqueamiento dental prolongado con peróxido de carbamida al 10 % (10CP) sobre la variación de masa del esmalte dental. Las muestras se dividieron en dos grupos: G1, diez dientes sanos de los incisivos bovinos (n = 5) en agua destilada, y G2, almacenamiento en saliva artificial. Las muestras se midieron en una escala analítica electrónica de precisión en los siguientes tiempos: T0-antes de la aplicación del gel blanqueador, T1-después de 14 días de blanqueo (el tiempo recomendado por el fabricante), T2-después de 21 días de blanqueo (aumento de 50 % en el tiempo recomendado por el fabricante), y T3-después de 28 días de blanqueo (aumento de 100 % en el tiempo recomendado por el fabricante). Los datos se presentaron al ANOVA para las muestras relacionadas (P = 0,5). La media más alta se observó en G2 (0,5982 g) y la media más baja se observó en G1 (0,3074 g) en T2 y T3, respectivamente. Se observaron diferencias significativas entre los grupos en todo momento. En general, la 10 CP causó variación en la masa del esmalte después de un aumento de 100 % en el tiempo de uso recomendado por el fabricante, con una disminución en la masa cuando el agua destilada se utilizó como medio de almacenamiento y aumentó cuando se usó saliva artificial.

Animals , Cattle , Tooth Bleaching , Dental Enamel/chemistry , Dental Enamel Solubility/drug effects , Tooth Bleaching Agents/pharmacology , Peroxides , Brazil , Ethics Committees , Livestock , Carbamide Peroxide
J. appl. oral sci ; 17(1): 56-60, Jan.-Feb. 2009. ilus, tab
Article in English | LILACS | ID: lil-502774


This in situ/ex vivo study assessed the effect of titanium tetrafluoride (TiF4) solution on erosion of permanent (P) and deciduous (d) human enamel. Ten volunteers wore acrylic palatal appliances containing 4 enamel samples, divided into two rows: TiF4 and no - TiF4 (control). Each row contained one deciduous and one permanent enamel sample. During the 1st day, formation of a salivary pellicle was allowed. At the 2nd day, the 4 percent TiF4 solution was applied on one row (TiF4), while the other row remained untreated (control). From the 3rd until the 7th day, the samples were subjected to erosion by immersion in a cola drink for 5 min, 4 times/day. Enamel alterations were determined by microhardness testing ( percentSMHC). Data were analyzed using 2 two-way ANOVA and Tukey's post hoc test (α=0.05). The mean percentSMHC (±SD) amounted to: P (TiF4 - 73.32 ± 5.16 and control - 83.49 ± 4.59) and d (TiF4 - 83.01 ± 7.41 and control - 75.75 ± 2.57). In conclusion, the application of 4 percent TiF4 solution reduced the softening of permanent enamel but not of deciduous enamel significantly. However, no significant differences were detected between the permanent and deciduous enamel when the factor substrate was considered.

Adult , Female , Humans , Male , Young Adult , Cariostatic Agents/pharmacology , Dental Enamel/drug effects , Fluorides/pharmacology , Fluorides/therapeutic use , Titanium/pharmacology , Titanium/therapeutic use , Tooth Erosion/prevention & control , Carbonated Beverages/adverse effects , Cariostatic Agents/therapeutic use , Dentition, Permanent , Dental Enamel Solubility/drug effects , Hardness/drug effects , Tooth, Deciduous , Tooth Erosion/etiology , Young Adult
J. appl. oral sci ; 16(4): 238-244, July-Aug. 2008. ilus, tab
Article in English | LILACS | ID: lil-486490


Although the prevalence of caries has decreased dramatically over the past decades, it has become a polarised disease, with most of subjects presenting low caries levels and few individuals accounting for most of the caries affected surfaces. Thus it become evident for the need of clinical approaches directed at these high-risk patients, in order to overcome problems related to compliance and low attendance at dental care centres. Slow-release fluoride devices were developed based on the inverse relationship existing between intra-oral fluoride levels and dental caries experience. The two main types of slow-release devices - copolymer membrane type and glass bead - are addressed in the present review. A substantial number of studies have demonstrated that these devices are effective in raising intra-oral F concentrations at levels able to reduce enamel solubility, resulting in a caries-protective effect. Studies in animals and humans demonstrated that the use of these devices was able to also protect the occlusal surfaces, not normally protected by conventional fluoride regimens. However, retention rates have been shown to be the main problem related to these devices and still requires further improvements. Although the results of these studies are very promising, further randomised clinical trials are needed in order to validate the use of these devices in clinical practice. The concept of continuously providing low levels of intra-oral fluoride has great potential for caries prevention in high caries-risk groups.

Animals , Humans , Cariostatic Agents/administration & dosage , Dental Caries/prevention & control , Drug Delivery Systems/instrumentation , Fluorides, Topical/administration & dosage , Durapatite , Dental Enamel Solubility/drug effects , Glass , Membranes, Artificial , Polymers , Polymethacrylic Acids
Braz. dent. j ; 19(1): 21-27, 2008. graf, tab
Article in English | LILACS | ID: lil-481123


Since the currently available pH-cycling models do not differentiate the anti-caries potential of dentifrices with low fluoride (F) concentration, two models were developed and tested in the present. Bovine enamel blocks were subjected to the models and treated with F solutions containing from 70 to 280 mug F/mL in order to validate them in terms of dose-response effect. The models were also tested by evaluating the dentifrices Colgate Baby (500 mug F/g, as a low fluoride dentifrice), Tandy (1,100 mug F/g, as an active F-dentifrice) and Crest (1,100 mug F/g, as positive control). Enamel mineral loss or gain was assessed by surface and cross-sectional microhardness, and lesion depth was analyzed by polarized light microscopy. The pH-cycling models showed F dose-response effect either reducing enamel demineralization or enhancing remineralization. The low F dentifrice presented anti-caries potential, but it was not equivalent to the dentifrices containing 1,100 mug F/g. These data suggest that the models developed in this study were able to evaluate the anti-caries potential of low F dentifrice either on resistance to demineralization or on enhancement of remineralization.

Tendo em vista que os modelos atuais de ciclagens de pH não diferenciam o potencial anti-cárie de dentifrícios com baixa concentração de fluoreto (F), dois modelos foram desenvolvidos e testados. Blocos de esmalte bovino foram submetidos aos modelos e tratados com soluções de concentrações crescentes de F (70 a 280 mig F/mL) para validar os modelos em termos de dose-resposta. A seguir, os modelos foram testados avaliando o potencial anti-cárie dos dentifrícios Colgate Baby (500 mig F/g, dentifrício de baixa concentração), Tandy (1.100 mig F/g, como controle ativo) e Crest (1.100 mig F/g, como controle positivo). Perda ou ganho de mineral pelo esmalte foi avaliada por microdureza e profundidade de lesão de cárie foi avaliada por microscopia de luz polarizada. Os modelos de ciclagens de pH desenvolvidos mostraram efeito do F dose-resposta quer seja na redução da desmineralização como na remineralização do esmalte. O dentifrício de baixa concentração de F mostrou ter potencial anti-cárie, o qual não foi equivalente aos dentifrícios contendo 1.100 mig F/g. Os resultados sugerem que os modelos desenvolvidos são capazes de avaliar o potencial anti-cárie de dentifrício de concentração reduzida de F, quer seja na sua capacidade de aumentar a resistência do esmalte a desmineralização como na ativação da remineralização.

Animals , Cattle , Cariostatic Agents/administration & dosage , Dental Enamel/drug effects , Dentifrices/administration & dosage , Fluorides/administration & dosage , Tooth Remineralization , Tooth Demineralization/prevention & control , Calcium/analysis , Dose-Response Relationship, Drug , Dental Enamel Solubility/drug effects , Dental Enamel/ultrastructure , Hardness , Hydrogen-Ion Concentration , Materials Testing , Microscopy, Polarization , Minerals/analysis , Random Allocation , Silicon Dioxide/administration & dosage , Sodium Fluoride/administration & dosage , Temperature , Time Factors , Tooth Demineralization/pathology
Braz. dent. j ; 14(3): 168-171, 2003. ilus
Article in English | LILACS | ID: lil-356706


O objetivo deste estudo in vitro foi de avaliar ao microscópio eletrônico de varredura os aspectos morfológicos do esmalte de dentes decíduos após condicionamento com ácido fosfórico a 36 por cento ou com um agente condicionador não lavável. Foram selecionados 10 dentes decíduos anteriores esfoliados naturalmente. As amostras sofreram limpeza coronária com pasta de pedra-pomes e água, em baixa-velocidade. O condicionamento foi realizado no esmalte da face vestibular. Os espécimes foram divididos em dois grupos: G1 (n=10): condicionamento com ácido fosfórico a 36 por cento na forma de gel - Conditioner 36 (Dentsply) durante 20 segundos, seguidos de lavagem com água durante 15 segundos; G2 (n=10): condicionamento com NRC - Non Rinse Conditioner (Dentsply) durante 20 segundos, seguidos de secagem com ar durante 15 segundos. As amostras foram desidratadas, montadas em bases metálicas e cobertas com ouro para análise ao microscópio eletrônico de varredura (Jeol JSM 6.100). A análise da eletromicrografias revelou que ambos os agentes condicionadores foram efetivos para condicionar o esmalte de dentes decíduos, causando microporosidades mas com melhor resultado quando utilizou-se o ácido fosfórico a 36 por cento na forma de gel.

Humans , Acid Etching, Dental/methods , Dental Enamel/drug effects , Maleates/pharmacology , Tooth, Deciduous/drug effects , Air , Dental Prophylaxis , Dental Enamel Solubility/drug effects , Dental Enamel/ultrastructure , Dental Materials/pharmacology , Materials Testing , Microscopy, Electron, Scanning , Porosity , Phosphoric Acids/pharmacology , Tooth, Deciduous/ultrastructure , Water
Rev. ADM ; 58(1): 31-5, ene.-feb. 2001. ilus, tab
Article in Spanish | LILACS | ID: lil-288838


El presente estudio "in vivo" se llevó a efecto en esmalte de dientes permanentes de niños residentes en Cd. Nezahualcóyotl y tuvo como objetivo evaluar, de manera indirecta, por medio de biopsias obtenidas con la técnica de De la Cruz y cols. (1992) la capacidad de tres agentes fluorurados de aplicación tópica para producir, en esmalte, un incremento de la resistencia al ataque ácido. Los agentes evaluados fueron flúor fosfato acidulado (APF) al 1,23 por ciento en gel, fluoruro de sodio (NaF) al 2 por ciento en solución acuosa y un barniz fluorado (BF) al 5 por ciento. Los resultados obtenidos antes de aplicar el APF en gel al 1,23 por ciento presentaron una media de profundidad de biopsia (PB) de 2,695u, una semana después la media fue de 1,0492u, los resultados posteriores fueron de 1,5835u. Por último, en el grupo del BF al 5 por ciento, elaborado en la Facultad de Estudios Superiores Saragoza, tuvo una PB inicial de 2,0492u, y una PB final de 1,2793u. La discusión se establece en términos de los factores que determinan estas diferencias

Humans , Male , Female , Acidulated Phosphate Fluoride/pharmacology , Dental Enamel Solubility/drug effects , Dental Enamel/drug effects , Fluorides, Topical/pharmacology , Sodium Fluoride/pharmacology , Dental Enamel Solubility/physiology , Dentition, Permanent , Hydrogen-Ion Concentration , Mexico , Data Interpretation, Statistical
Salud pública Méx ; 37(3): 224-31, mayo-jun. 1995. tab
Article in Spanish | LILACS | ID: lil-167362


La resistencia del esmalte a la disolución ácida es un factor que influye en la susceptibilidad a la caries. Los propósitos del presente estudio fueron determinar la resistencia del esmalte a la disolución ácida a través de la técnica colorimétrica (RM) y correlacionar los datos obtenidos con la prevalencia de caries. Se seleccionaron 271 niños entre los siete y nueve años de edad, con los incisivos centrales superiores permanentes erupcionados, y se realizó el registro de los índices CPO-d y ceo-d y la prueba de resistencia del esmalte RM a través de un muestreo probabilístico de conveniencia en dos delegaciones, (seis escuelas públicas del Distrito Federal). De la muestra el 56.4 por ciento, registró esmalte muy resistente, el 27.3 por ciento menos resistente y el 16.2 por ciento poco resistente. El 57.9 por ciento se encontró libre de caries en la dentición permanente y el 10 por ciento en la dentición temporal; el promedio del índice CPO-D fue de 0.93 ñ 1.34 y del ceo-d 4.71 ñ 3.1. Los datos sugieren que la distribución de la resistencia del esmalte no es homogénea y que ésta aumenta proporcionalmente conforme al tercio de erupción (p< 0.05); el factor de correlación de Spearman fue negativo y estadísticamente significativo (p<0.05). La técnica RM demostró la existencia de individuos con diferente resistencia del esmalte a la disolución ácida

Child , Acids/pharmacology , Age Factors , Dental Caries/epidemiology , Dental Enamel Solubility/drug effects , Tooth Eruption , Hydrogen-Ion Concentration , Incisor , Mexico/epidemiology , Urban Population
Rev. Fac. Odontol. Univ. Chile ; 4(1): 32-7, ene.-jun. 1986. tab
Article in Spanish | LILACS | ID: lil-65925


Un estudio in vitro de la acción del pH sobre esmalte de dientes temporales fluorurados tópicamente in vivo mediante una solución de NaF 0.05% fue llevado a la práctica para determinar la cantidad de tejido sano disuelto en una solución bufferizada de igual concentración (ácido láctico/lactato de sodio 0.5 N), pero a diferentes rangos de pH. El banco de esmalte aislado se obtuvo ocupando una técnica gravimétrica basándose en la densidad de los tejidos del diente. El polvo de esmalte fluorurado obtenido con un alto porcentaje de pureza fue sometido al test de solubilidad con el fin de poder encontrar una relación entre el grado de disolución ácida de la muestra en el buffer ácido láctico/lactato de sodio y los distintos pH a los cuales se tamponó la solución. La capacidad protectora de la sal fluorurada sobre el esmalte de dientes temporales frente a la acción de la solución a los pH indicados está expresada en peso disuelto en mg. Los resultados obtenidos muestran que existe una correlación lineal negativa (-0,9822) entre la variación del peso de pulverizado de esmalte disuelto y la acidez (pH) de la solución de ácido láctico/lactato de sodio 0,5 N

Humans , Dental Caries/prevention & control , Dental Enamel Solubility/drug effects , In Vitro Techniques , Philippines , Sodium Fluoride/pharmacology