Effect of cholorhexidine gel and ozone gel on microleakage and shearbond strength in composite restoration of primary teeth

Abstract

Introduction: The aim of this in vitro study was to investigate the effect of two antimicrobial agents on shear bond strength and microleakage of composite restorations in primary teeth.

Materials and Methods: In this experimental research, extracted primary molars and canines were collected. Shear bond strength tests: 60 teeth were divided into three different groups (��� = 20) according to the dentin surface pretreatment (chlorhexidine gluconate 2%, ozone gel, control group) and two subgroups (sound and caries-affected dentin). Bulk Fill composite resin was applied to the dentin surface and light-cured. The shear bond strength of the restoration was evaluated by universal test machines. Microleakage test process: A class V cavity was prepared on the buccal surface of the teeth and restored with composite resin. Then all of teeth were cut buccolingually. Two separate observers examined the microleakage in the incisal and gingival margins with a stereomicroscope. In each specimen, depth of stain penetration was measured separately according to the scale. Data were analyzed by SPSS software and Independent T-Test, One Way Anova, and Chi-Square test.

Results: In both sound and caries-affected dentin, ozone gel had higher shear bond strength than chlorhexidine gel and the control group. Chlorhexidine gel had no significant effect on the shear bond strength of sound dentin but reduced it in the caries-affected dentin. In both types of disinfectants, the shear bond strength of the caries-affected dentin was significantly lower than that of the sound dentin. The application of chlorhexidine gel in caries-affected dentin caused more microleakage than sound dentin, Still, in the ozone gel group, the amount of microleakage was similar in both types of dentins.

Conclusion: in both sound and caries-affected dentin, ozone gel had higher shear bond strength than chlorhexidine gel, also chlorhexidine increased rate of microleakage and ozone gel decreased it.