Revista de Odontologia da UNESP
https://revodontolunesp.com.br/article/doi/10.1590/1807-2577.02019
Revista de Odontologia da UNESP
Original Article

Evaluation of the effect of chlorhexidine and sodium hypochlorite in adhesive cementation of fiber posts - in vitro study

Avaliação do efeito da clorexidina e do hipoclorito de sódio na cimentação adesiva de pinos – estudo in vitro

Tainara CONTE; Guilherme Schmitt de ANDRADE; Ana Paula GADONSKI; Daniella Cristo SANTIN; Fabiana Scarparo NAUFEL

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Abstract

Abstract: Introduction: The attachment of fiberglass posts is achieved through an adhesive process. Failures in adhesion may occur due to the hydrolytic degradation of the adhesives, or to the degradation of the collagen fibres of the hybrid layer by intrinsic enzymes.

Objective: To evaluate the effect of chlorhexidine and sodium hypochlorite treatment on bond strength to dentin.

Material and method: Thirty bovine roots were randomly distributed into 3 groups (n=10): a) Control, b) 2% Chlorhexidine, and c) 5% Sodium Hypochlorite. Next, RelyX® ARC resin cement was used to cement the post. Each specimen resulted in samples from the three root thirds that were submitted to the pushout test (MPa) at 24 hours and 12 months. Bond strength values were analysed using the Kolmogorov-Smirnov, 3-way ANOVA and Tukey tests. The fracture mode of the pin was also analysed using stereomicroscopy.

Result: There were no significant differences between treatments at the immediate time (p=0.0644) or in the interaction of factors (p=0.1935). After one year, the experimental groups showed no significant differences in bond strength in relation to the control group, with the exception of the cervical third of the chlorohexidine group in which there was a significant loss of adhesion. As for the fracture mode, there was a predominance of the mixed type in all groups and thirds.

Conclusion: The use of chlorhexidine or hypochlorite provides neither benefits nor losses in the adhesive bond strength of fiberglass posts. However, there is an influence of the root thirds, with the worst bond strength in the apical third.

Keywords

Cementing, dental posts, resin cements, chlorhexidine, sodium hypochlorite

Resumo

Resumo: Introdução: A fixação de pinos de fibra de vidro é realizada através de um processo adesivo. Falhas podem ocorrer na adesão devido à degradação hidrolítica dos adesivos, ou pela degradação das fibras colágenas da camada híbrida por enzimas intrínsecas.

Objetivo: Avaliar o efeito do tratamento com clorexidina e hipoclorito de sódio sobre a resistência de união adesiva à dentina.

Material e método: Trinta raízes bovinas foram distribuídas aleatoriamente em 3 grupos (n=10): a) Controle, b) Clorexidina 2% e c) Hipoclorito de Sódio 5%. Após, para a cimentação do pino radicular, utilizou-se o cimento resinoso RelyX® ARC. Cada espécime resultou corpos-de-prova dos três terços radiculares, os quais foram submetidos ao teste de pushout (MPa) nos períodos de 24 horas e 12 meses. Valores de resistência de união foram analisados pelos testes de Kolmogorov-Smirnov, ANOVA (three-way) e de Tukey. Analisou-se ainda o modo de fratura do pino, através de estereomicroscopia.

Resultado: Não houve diferenças significativas entre tratamento no tempo imediato (p=0,0644) ou na interação dos fatores (p=0,1935). Após um ano, os grupos experimentais não promoveram diferença significante na resistência de união em relação ao controle, com exceção do terço cervical do grupo clorexidina, onde houve uma perda significativa de adesão. Quanto ao modo de fratura, houve predominância do tipo mista em todos os grupos e terços.

Conclusão: O uso de clorexidina ou hipoclorito não promove benefícios ou prejuízos na resistência de união adesiva de pinos de fibra, mas há influência dos terços radiculares, sendo a pior resistência de união no terço apical.
 

Palavras-chave

Cimentação, pinos dentários, cimentos de resina, clorexidina, hipoclorito de sódio

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