Effect of chlorhexidine concentration on the bond strength to dentin in primary teeth

Efeito da concentração de clorexidina na resistência de união à dentina em dentes decíduos

Aline Rosler Grings Manfro^I; Alessandra Reis^II; Alessandro Dourado Loguercio^II; José Carlos Pettorossi Imparato^III; Daniela Prócida Raggio^IV

^IPost Graduation Course in Pediatric Dentistry, Dental Research Center São Leopoldo Mandic, Campinas, SP, Brazil
^IISchool of Dentistry, State University of Ponta Grossa, Ponta Grossa, PR, Brazil ]]> ^IIIPost Graduation Program, Dental Research Center São Leopoldo Mandic, Campinas, SP, Brazil
^IVDiscipline of Pediatric Dentistry, University of São Paulo, São Paulo, SP, Brazil

Correspondence

ABSTRACT

PURPOSE: To evaluate the effect of the use of 0.5% and 2% chlorhexidine digluconate on the immediate bond strength of a conventional adhesive system to dentin in primary teeth.
METHODS: Twenty-one healthy primary molars were divided into three groups (n=7), being one control (A) and two experimental groups (B and C). After dentin exposure, in Group (A) the adhesive procedure was performed using 37% phosphoric acid gel (15 s); dentin was washed (15 s), air dried (30 s) and rehydrated with water. Groups B and C followed similar procedures but for re-hydration with 0.5% and 2% chlorhexidine, respectively, for 30 s. A resin composite block was built simulating a restoration, and the teeth were stored in distilled water at 37°C for 24 h before the microtensile bond strength test. The bond strength data were analyzed by analysis of variance.
RESULTS: No statistically significant difference in bond strength was found among the tested groups (P>0.05)
CONCLUSION: The 0.5% and 2% concentrations of chlorhexidine presented similar behavior and caused no adverse effects on the bond strength to dentin in primary teeth.

RESUMO

OBJETIVO: Avaliar o efeito do uso de digluconato de clorexidina 0,5% e 2% na resistência de união imediata à dentina de dentes decíduos para um sistema adesivo convencional.
METODOLOGIA: Vinte e um molares decíduos hígidos foram divididos em três grupos (n=7), sendo um controle e dois experimentais. Após a exposição da dentina, foi realizado no grupo controle (A) o procedimento adesivo utilizando ácido fosfórico gel a 37% (15 s); a superfície foi então lavada (15 s), seca com ar (30 s) e reidratada com água. Os grupos B e C foram idênticos ao grupo A, apenas com diferença no reumidecimento de clorexidina 0,5% e 2% respectivamente, por 30 s. Após a confecção do bloco de resina composta, os dentes foram armazenados em água destilada a 37°C por 24 h antes do teste de microtração. Os dados de resistência de união foram avaliados através de análise de variância.
RESULTADOS: Os dados apresentaram distribuição homogênea, não havendo diferença estatisticamente significante entre os grupos (P>0,05).
CONCLUSÃO: As concentrações de clorexidina a 0,5% e 2% apresentaram comportamentos similares e não causaram efeitos adversos na resistência de união em dentina de dentes decíduos, quando comparadas ao grupo controle.

Palavras-chave: Clorexidina; resistência de união; microtração; dentes decíduos

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Correspondence:
Daniela Prócida Raggio
Av. Lineu Prestes, 2227 Cidade Universitária
São Paulo, SP - Brasil 05508-000
E-mail: danielar@usp.br

Received: October 1, 2009
Accepted: December 21, 2009