Análise da penetração de material resinoso ao esmalte dental em função de agente clareador e tempo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Citotoxicidade de agentes clareadores para dentes tratados endodonticamente sobre fibroblastos gengivais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo in vitro em MEV da morfologia do esmalte, dentina, cemento e da junção amelocementária humanos antes e após a clareação

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência do clareamento dental na cor, translucidez e fluorescência do esmalte e dentina

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação da alteração de cor, difusão de peróxido de hidrogênio e citotoxicidade trans-amelodentinária causadas por diferentes técnicas de clareamento dental

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação in vitro da efetividade de associações de agentes clareadores na alteração da cor de dentes manchados por pigmentos sangüineos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação da citotoxicidade de agentes clareadores para uso caseiro e profissional

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Citotoxicidade, produção de espécies reativas de oxigênio, expressão de marcadores celulares e produção de TNFα em macrófagos após exposição a agentes clareadores

Pós-graduação em Odontologia Restauradora - ICT

Avaliação in vitro das alterações do esmalte humano, efetividade clínica e sensibilidade pós-clareamento dentário

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Ação do fluor na microdureza do esmalte humano submetido a dois tipos de agentes clareadores

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Novos parâmetros para o clareamento dental: avaliação da eficácia, citotoxicidade e efeitos moleculares

Pós-graduação em Reabilitação Oral - FOAR

Effect of different bleaching protocols on dental enamel and composite resin

To evaluate changes in microhardness, roughness and surface morphology of dental enamel and composite resin after different tooth bleaching techniques. Material and Methods: Dental fragments from bovine incisors with composite resin restorations were submitted to different bleaching protocols: G1 – daily 8 hours application of a 10% carbamide peroxide (CP) gel during 21 days; G2: 3 applications of 15 minutes of a 38% hydrogen peroxide (H2O2) gel; G3: 38% H2O2 gel associated to irradiation with LED (470nm) during 6 minutes. The Knoop micro hardness of enamel and composite resin were evaluated at 1, 7, 14 and 21 days for G1, and after 1, 2 and 3 sessions for G2 and G3. The roughness and superficial morphology (atomic force microscopy) were evaluated before and at the end of the bleaching treatment. The data were analyzed by Mann-Whitney and Wilcoxon tests (=5%). Results: Significant reduction on enamel hardness was observed after 2 and 3 sessions for G2 and G3. For composite, the reduction occurred after 21 days for G1, and after 3 sessions for G2 and G3 (p<0.05). Significant reduction on roughness and superficial morphology were observed only for enamel of G1 group (p<0.05). Conclusion: The 10% CP gel promoted only superficial alterations on dental enamel, while the 38% H2O2 gel promoted mineral reduction of this dental tissue. All the bleaching protocols promoted reduction on hardness of composite resin.

Efeitos de diferentes sistemas de clareamento dental sobre a rugosidade e morfologia superficial do esmalte e de uma resina composta restauradora

The aim of this study was to evaluate and compare the roughness and superficial morphology of enamel and a composite restorative resin after different bleaching techniques application. Material and Methods: Bovine incisors were selected and standardized cavities were prepared on the buccal surface, which were restored with composite resin. The teeth were distributed according to the following treatments: G1- bleaching with 10% carbamide peroxide (CP); G2 - bleaching with 38% hydrogen peroxide (HP); and G3 - bleaching with 38% of HP associated to light irradiation. For G1, the bleaching gel was applied for 8 hours daily during 21 days. For G2 and G3, 3 sessions were performed, consisting of 3 applications of 15 minutes each, with 7 days of intervals between the sessions. For G3, the LED (470nm) light was used to activate the bleaching agent for 6 minutes. The surface of enamel and composite resin were evaluated before and after the bleaching procedures using a roughness tester and an atomic force microscope. Results: The results showed significant differences in surface roughness of enamel after bleaching only for G1 (Wilcoxon, p<0.05). For composite resin, neither group showed a statistical difference compared to control (Mann-Whitney, p>0.05). Conclusion: It was concluded that the increase in the roughness of enamel occurred only after bleaching therapy using a gel with 10% of CP. The bleaching procedures evaluated in this investigation did not increase the roughness or cause changes in the superficial morphology of the composite resin.

Microhardness of the enamel exposed to whitening dentifrices

The purpose of this study is to verify the effect of three different types of dentifrices on the superficial microhardness of bovine enamel. Methods: Forty-eight 4x4mm dental fragments were polished and randomly divided into 4 groups: GI, conventional silica-based dentifrice; GII, hydrogen peroxide-based dentifrice; GIII, carbamide peroxide-based dentifrice; and GIV, immersion in artificial saliva. After polished, the specimens received five indentations of 25g static load, for 5 seconds. Subsequently, specimens from groups GI, GII and GIII were immersed in solution containing dentifrice and distilled water, in weight proportion of 1:2, for 15 minutes daily. After this period, fragments were rinsed in tap water and stored in artificial saliva at 37oC. This procedure was repeated for 21 days and then a new analysis of the microhardness was performed. Results and conclusion: The results were submitted to ANOVA and Fisher’s test at 5%. It was concluded that all samples treated with dentifrices showed hardness decrease, being most pronounced in dentifrices containing peroxide.

Fracture resistance of endodontically-treated teeth submitted to bleaching treatment with hydrogen peroxide and titanium dioxide nanoparticles photoactivated by LED-laser

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)