Avaliação in vitro dos efeitos do clareamento dentário com fotossensibilização em dentes não vitais
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Data
2023-02-24
Autores
Almeida, Eran Nair Mesquita de
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Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste estudo in vitro foi avaliar os efeitos da técnica de clareamento utilizando Led Violeta sobre a resistência à fratura, formação da camada híbrida, microdureza e estabilidade de cor em diferentes períodos de tempo (T1: 7 dias, T2: 14 dias, T3: 21 dias, T30: 30 dias e T9M: 9 meses após a última sessão clareadora). Para avaliação da resistência a fratura e formação da camada híbrida os grupos foram: C: Sem tratamento (grupo controle); HP: Whiteness HP Maxx 35% (FGM); HP-BL: Whiteness HP Maxx 35% (FGM) + Led Azul Twin Flex Evolution (MMOptics); HP-VL: Whiteness HP Maxx 35% (FGM) + Led Violeta – Bright Max Whitening (MMOptics). Para o teste de microdureza e cor, diferentes protocolos foram testados: C: Sem tratamento (grupo controle); HP: Whiteness HP 35% (FGM); HP-BL: Whiteness HP 35% (FGM) + Led Azul Twin Flex Evolution (MMOptics); HP-VL: Whiteness HP 35% + Led Violeta – Bright Max Whitening (MMOptics); VL: Led Violeta – Bright Max Whitening (MMOptics), que foi adicionado para avaliação de cor. Na resistência a fratura foram utilizados (N = 40) espécimes, formação da camada híbrida (N = 20), microdureza (N = 40) e estabilidade de cor (N = 50). Os protocolos clareadores foram aplicados de acordo com a recomendação dos fabricantes dos produtos e dos equipamentos, totalizando 3 sessões de clareamento, com intervalo de 7 dias entre elas. Os espécimes permaneceram em saliva artificial a 37°C durante todo o período referente aos experimentos, sendo substituída a cada 7 dias. Os dados obtidos foram analisados por análise de variância (ANOVA one-way, teste de kruskal-Wallis e ANOVA two-way, respectivamente) e pós teste ao nível de 5% de significância. Não foram encontradas diferenças significativas entre os protocolos de clareamento quanto ao efeito sobre a resistência à fratura (p > 0,05). Na avaliação da formação camada híbrida, todos os grupos com HP interferiram em algum nível. Na microdureza HP e C demonstraram respectivamente a maior e menor redução da microdureza dentinária após o uso dos protocolos de clareamento dental (p < 0.05). No entanto, não houve diferença entre os protocolos HP-BL e HP-VL (p > 0.05). Na avaliação de cor os valores médios (DP) de ∆E e ∆WID, os grupos HP, HP BL e HP VL apresentam maior alteração de cor quando comparados a C e VL. HP, HP BL e HP VL não apresentam diferenças significativas entre si após 9 meses da realização do protocolo de clareamento.
The objective of this in vitro study was to evaluate the effects of the bleaching technique using Led Violet on the resistance to fracture, formation of the hybrid layer, microhardness and color stability in different periods of time (T1: 7 days, T2: 14 days, T3: 21 days, T30: 30 days and T9M: 9 months after the last whitening session). For the evaluation of resistance to fracture and formation of the hybrid layer, the groups were: C: No treatment (control group); HP: Whiteness HP Maxx 35% (FGM); HP-BL: Whiteness HP Maxx 35% (FGM) + Twin Flex Evolution Blue Led (MMOptics); HP-VL: Whiteness HP Maxx 35% (FGM) + Violet Led – Bright Max Whitening (MMOptics). For the microhardness and color test, different protocols were tested: C: No treatment (control group); HP: Whiteness HP 35% (FGM); HP-BL: Whiteness HP 35% (FGM) + Twin Flex Evolution Blue Led (MMOptics); HP-VL: Whiteness HP 35% + Violet Led – Bright Max Whitening (MMOptics); VL: Led Violet – Bright Max Whitening (MMOptics), which was added for color evaluation. The fracture resistance (N = 40) specimens, hybrid layer formation (N = 20), microhardness (N = 40) and color stability (N = 50) were used. The bleaching protocols were applied according to the recommendations of the product and equipment manufacturers, totaling 3 bleaching sessions, with an interval of 7 days between them. The specimens remained in artificial saliva at 37°C throughout the period referring to the experiments, being replaced every 7 days. The data obtained were analyzed by analysis of variance (one-way ANOVA, Kruskal-Wallis test and two-way ANOVA, respectively) and post-test at a 5% significance level. No significant differences were found between bleaching protocols regarding the effect on fracture toughness (p > 0.05). In evaluating the hybrid layer formation, all groups with HP interfered at some level. In terms of microhardness, HP and C showed, respectively, the greatest and smallest reduction in dentin microhardness after the use of dental bleaching protocols (p < 0.05). However, there was no difference between the HP-BL and HP-VL protocols (p > 0.05). In the color evaluation, the mean values (SD) of ∆E and ∆WID, the HP, HP BL and HP VL groups present greater color change when compared to C and VL. HP, HP BL and HP VL do not present significant differences among themselves after 9 months of the bleaching protocol.
The objective of this in vitro study was to evaluate the effects of the bleaching technique using Led Violet on the resistance to fracture, formation of the hybrid layer, microhardness and color stability in different periods of time (T1: 7 days, T2: 14 days, T3: 21 days, T30: 30 days and T9M: 9 months after the last whitening session). For the evaluation of resistance to fracture and formation of the hybrid layer, the groups were: C: No treatment (control group); HP: Whiteness HP Maxx 35% (FGM); HP-BL: Whiteness HP Maxx 35% (FGM) + Twin Flex Evolution Blue Led (MMOptics); HP-VL: Whiteness HP Maxx 35% (FGM) + Violet Led – Bright Max Whitening (MMOptics). For the microhardness and color test, different protocols were tested: C: No treatment (control group); HP: Whiteness HP 35% (FGM); HP-BL: Whiteness HP 35% (FGM) + Twin Flex Evolution Blue Led (MMOptics); HP-VL: Whiteness HP 35% + Violet Led – Bright Max Whitening (MMOptics); VL: Led Violet – Bright Max Whitening (MMOptics), which was added for color evaluation. The fracture resistance (N = 40) specimens, hybrid layer formation (N = 20), microhardness (N = 40) and color stability (N = 50) were used. The bleaching protocols were applied according to the recommendations of the product and equipment manufacturers, totaling 3 bleaching sessions, with an interval of 7 days between them. The specimens remained in artificial saliva at 37°C throughout the period referring to the experiments, being replaced every 7 days. The data obtained were analyzed by analysis of variance (one-way ANOVA, Kruskal-Wallis test and two-way ANOVA, respectively) and post-test at a 5% significance level. No significant differences were found between bleaching protocols regarding the effect on fracture toughness (p > 0.05). In evaluating the hybrid layer formation, all groups with HP interfered at some level. In terms of microhardness, HP and C showed, respectively, the greatest and smallest reduction in dentin microhardness after the use of dental bleaching protocols (p < 0.05). However, there was no difference between the HP-BL and HP-VL protocols (p > 0.05). In the color evaluation, the mean values (SD) of ∆E and ∆WID, the HP, HP BL and HP VL groups present greater color change when compared to C and VL. HP, HP BL and HP VL do not present significant differences among themselves after 9 months of the bleaching protocol.
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Palavras-chave
Clareamento dental, Dente não vital, Peróxido de hidrogênio, Tooth bleaching, Tooth, nonvital., Hydrogen peroxide