Influência da terapia fotodinâmica com azul de metileno na resistência de união do cimento MTA Fillapex à dentina intrarradicular.
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Data
2020-09-16
Autores
Tanganini, Thales Matheus Martins. [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Introdução: A terapia fotodinâmica (TFD) é utilizada como coadjuvante ao tratamento endodôntico para potencializar a redução microbiana no sistema de canais radiculares. No entanto, a literatura carece de estudos sobre as consequências da TFD na resistência de união do cimento obturador à dentina intrarradicular. O objetivo deste estudo foi avaliar a influência da TFD com azul de metileno na resistência de união do cimento obturador (MTA Fillapex) utilizando o teste de push-out. Material e Métodos: Quarenta dentes bovinos foram utilizados para simular o tratamento endodôntico. O preparo biomecânico foi realizado em todos os canais radiculares e os espécimes foram distribuídos em 5 grupos: controle (água deionizada); azul de metileno 50 mg/L (AM50SL); azul de metileno 100 mg/L (AM100SL); azul de metileno 50 mg/L + laser vermelho 660nm (AM50L) (TFD); e de azul de metileno 100 mg/L + laser vermelho 660nm (AM100L) (TFD). A resistência de união do cimento obturador à dentina foi medida usando uma máquina de teste universal (n=8). Os dados de resistência de união foram submetidos ao teste de Kruskal-Wallis para comparação entre grupos e ao teste de Friedman para comparação entre terços (P=.05). Resultados: Houve diferença estatística significante para o grupo azul de metileno 100 mg/L + laser vermelho 660nm (TFD) quando comparando os terços radiculares, onde o terço apical apresentou maiores valores de resistência de união em relação ao terço médio (P=.0302). Nos demais grupos e terços não houve diferença estatística significante (P=.0,5). Conclusão: Pode-se concluir que o uso de TFD com o fotossensibilizador azul de metileno na concentração de 50 mg/L não alterou negativamente a resistência de união do cimento obturador MTA Fillapex na dentina intrarradicular.
Introduction: Photodynamic therapy (PDT) is used as an adjunct to endodontic treatment to potentiate microbial reduction in the root canal system. However, the literature lacks studies on the consequences of PDT on the union resistance of obturator cement to intraradicular dentin. The aim of this study was to evaluate the influence of PDT with methylene blue on the strength of the cement filler (MTA Fillapex) using the push-out test. Material and Methods: Forty bovine teeth were used to simulate endodontic treatment. Biomechanical preparation was performed in all root canals and specimens were distributed into 5 groups: control (deionized water); methylene blue 50 mg/L (MB50SL); methylene blue 100 mg/L (AM100SL); methylene blue 50 mg/L + 660nm red laser (MB50L) (PDT); and methylene blue 100 mg/L + 660nm red laser (MB100L) (PDT). The union strength of the shutter cement to the dentin was measured using a universal test machine (n=8). The union resistance data were submitted to the Kruskal-Wallis test for comparison between groups and the Friedman test for comparison between thirds (P=.05). Results: There was a statistically significant difference for the blue methylene group 100 mg/L + 660nm red laser (PDT) when comparing the root thirds, where the apical third presented higher values of union resistance in relation to the middle third (P=.0302). In the other groups and thirds there was no statistically significant difference (P=.0.5). Conclusion: It can be concluded that the use of PDT with the blue photosensitizer of methylene at the concentration of 50 mg/L did not negatively alter the union strength of the MTA Fillapex shutter cement in the intraradicular dentin.
Introduction: Photodynamic therapy (PDT) is used as an adjunct to endodontic treatment to potentiate microbial reduction in the root canal system. However, the literature lacks studies on the consequences of PDT on the union resistance of obturator cement to intraradicular dentin. The aim of this study was to evaluate the influence of PDT with methylene blue on the strength of the cement filler (MTA Fillapex) using the push-out test. Material and Methods: Forty bovine teeth were used to simulate endodontic treatment. Biomechanical preparation was performed in all root canals and specimens were distributed into 5 groups: control (deionized water); methylene blue 50 mg/L (MB50SL); methylene blue 100 mg/L (AM100SL); methylene blue 50 mg/L + 660nm red laser (MB50L) (PDT); and methylene blue 100 mg/L + 660nm red laser (MB100L) (PDT). The union strength of the shutter cement to the dentin was measured using a universal test machine (n=8). The union resistance data were submitted to the Kruskal-Wallis test for comparison between groups and the Friedman test for comparison between thirds (P=.05). Results: There was a statistically significant difference for the blue methylene group 100 mg/L + 660nm red laser (PDT) when comparing the root thirds, where the apical third presented higher values of union resistance in relation to the middle third (P=.0302). In the other groups and thirds there was no statistically significant difference (P=.0.5). Conclusion: It can be concluded that the use of PDT with the blue photosensitizer of methylene at the concentration of 50 mg/L did not negatively alter the union strength of the MTA Fillapex shutter cement in the intraradicular dentin.
Descrição
Palavras-chave
Fotoquimioterapia, Resistência ao cisalhamento, Materiais restauradores do canal radicular, Photochemotherapy