Efeitos de soluções ácidas de limpeza sobre a interface de adesão entre dentina radicular e sistema de cimentação de pino de fibra
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Data
2020-03-16
Autores
Belizário, Lauriê Garcia
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo desse estudo foi avaliar o efeito da irrigação do espaço para pino de fibra e a capacidade de limpeza com a solução contendo ácido bórico a 5% e ácido cítrico a 1% (EX) ou ácido peracético a 1% (PA) e os seus efeitos sobre a resistência de união, penetrabilidade dentinária e presença de smear layer nos túbulos dentinários. Após obturação dos canais radiculares de dentes bovinos, foi realizado o preparo intrarradicular para pino de fibra com instrumento rotatório. Os dentes foram divididos em quatro grupos (n=10), de acordo com o protocolo de irrigação do espaço intrarradicular: G1 (DW): água destilada, G2 (SH): hipoclorito de sódio a 2.5% e EDTA 17%, G3 (PA): ácido peracético e G4 (EX): ácido bórico a 5% e ácido cítrico a 1%. No estudo 1, foi utilizado o sistema adesivo Ambar Universal e os pinos foram cimentados com cimento resinoso dual (Allcem Core). Após 24h (WDI, SHI, PAD e EXD) ou 6 meses (WDD, SHD, PAD e EXD), os terços cervical, médio e apical foram submetidos aos testes de push-out e penetrabilidade dentinária do sistema de cimentação. Os dentes foram submetidos à análise em MEV(2.000). No estudo 2, avaliou-se o potencial de limpeza da dentina sobre a resistência de união entre dentina e sistema de cimentação com o adesivo Universal (SU; Single Bond Universal) e cimento resinoso (RU; Relyx Ultimate). Os dentes foram submetidos à análise em MEV (500X), para avaliar a presença da smear layer e teste de push-out em 24h (DWI, EXI, SHI e PAI) ou 6 meses (DWD, EXD, SHD e PAD) após a cimentação do pino de fibra (WhitePost DC) anatomizados . No estudo 3, os dentes foram submetidos à análise em MEV (2000), para avaliar a limpeza e quantidade de túbulos dentinários abertos. Independentemente do terço do espaço para pino avaliado, o protocolo de irrigação com EX proporcionou menor incidência de smear layer, não interferiu na resistência de união e maior penetrabilidade (p < 0.05). Os achados sugerem que a solução EX proporcionou menor incidência de resíduos, não interferiu sobre a resistência de união e proporcionou maior penetrabilidade do sistema de cimentação entre a dentina e diferentes sistemas de cimentação com adesivos universais.
The objective of this study was to evaluate the effect of space irrigation for fiber posts and the ability to clean with a solution containing 5% boric acid and 1% citric acid (EX) or 1% peracetic acid (PA) and the its effects on bond strength, dentin permeability and presence of smear layer in dentinal tubules. After filling root canals of bovine teeth, intraradicular preparation was performed for fiber posts with a rotary instrument. The teeth were divided into four groups (n = 10), according to the intraradicular space irrigation protocol: G1 (DW): distilled water, G2 (SH): 2.5% sodium hypochlorite and 17% EDTA, G3 (PA): peracetic acid and G4 (EX): 5% boric acid and 1% citric acid. In study 1, the Ambar Universal adhesive system was used and the posts were cemented with dual resin cement (Allcem Core). After 24h (WDI, SHI, PAD and EXD) or 6 months (WDD, SHD, PAD and EXD), the cervical, middle and apical thirds were submitted to push-out tests and dentin penetration of the cementation system. The teeth were subjected to SEM analysis (2000C). In study 2, the dentin detritus removal potential on the bond strength between dentin and cementation system with Universal adhesive (SU; Single Bond Universal) and resin cement (RU; Relyx Ultimate) was evaluated. The teeth were submitted to SEM analysis (500X), to assess the presence of the smear layer and push-out test in 24 hours (DWI, EXI, SHI and PAI) or 6 months (DWD, EXD, SHD and PAD) after cementation of the fiber post (WhitePost DC). In study 3, the teeth were subjected to SEM analysis (2000C) to assess the cleanliness and quantity of open dentinal tubules. Regardless of the third of the assessed post space, the EX irrigation protocol provided a lower incidence of smear layer, did not interfere with the bond strength and increased penetrability (p <0.05). The findings suggest that the EX solution provided a lower incidence of residues, did not interfere with the bond strength and provided greater penetrability of the cementation system between dentin and different cementation systems with universal adhesives.
The objective of this study was to evaluate the effect of space irrigation for fiber posts and the ability to clean with a solution containing 5% boric acid and 1% citric acid (EX) or 1% peracetic acid (PA) and the its effects on bond strength, dentin permeability and presence of smear layer in dentinal tubules. After filling root canals of bovine teeth, intraradicular preparation was performed for fiber posts with a rotary instrument. The teeth were divided into four groups (n = 10), according to the intraradicular space irrigation protocol: G1 (DW): distilled water, G2 (SH): 2.5% sodium hypochlorite and 17% EDTA, G3 (PA): peracetic acid and G4 (EX): 5% boric acid and 1% citric acid. In study 1, the Ambar Universal adhesive system was used and the posts were cemented with dual resin cement (Allcem Core). After 24h (WDI, SHI, PAD and EXD) or 6 months (WDD, SHD, PAD and EXD), the cervical, middle and apical thirds were submitted to push-out tests and dentin penetration of the cementation system. The teeth were subjected to SEM analysis (2000C). In study 2, the dentin detritus removal potential on the bond strength between dentin and cementation system with Universal adhesive (SU; Single Bond Universal) and resin cement (RU; Relyx Ultimate) was evaluated. The teeth were submitted to SEM analysis (500X), to assess the presence of the smear layer and push-out test in 24 hours (DWI, EXI, SHI and PAI) or 6 months (DWD, EXD, SHD and PAD) after cementation of the fiber post (WhitePost DC). In study 3, the teeth were subjected to SEM analysis (2000C) to assess the cleanliness and quantity of open dentinal tubules. Regardless of the third of the assessed post space, the EX irrigation protocol provided a lower incidence of smear layer, did not interfere with the bond strength and increased penetrability (p <0.05). The findings suggest that the EX solution provided a lower incidence of residues, did not interfere with the bond strength and provided greater penetrability of the cementation system between dentin and different cementation systems with universal adhesives.
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Palavras-chave
Pino de fibra de vidro, Dentina, Endodontia, Fiber post, Dentin, Endodontics