Volume 24, Issue 103, May - June, 2020

Comparison of the effect of Chlorhexidine and collagen cross-linking agent (Quercus Extract) on the tensile bond strength of composite to dentin

Mehran Mapar¹, Mina Moalemnia^2♦, Somayeh Kalantari³

¹Assistant Professor, Department of Restorative Dentistry, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
²Third-Year Resident, Department of Restorative Dentistry, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
³Graduate Resident, Department of Restorative Dentistry, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

^♦Corresponding author
Third-Year Resident, Department of Restorative Dentistry, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

ABSTRACT

Statement of the Problem: Several improvements in dental adhesive technology and advances in bonding knowledge have been achieved, but the issue of bond durability between resin composite and dentine is still a major challenge in adhesive dentistry. Purpose: The aim of the present study was to evaluate the effect of chlorhexidine (2% inhibitor matrix metallo proteinase) and collagen cross-linking agent (Quercus extract for stabilizer of collagen fibers) on tensile bond strength of composite to dentin. Materials and Method: A total of 75 extracted human upper premolar teeth were selected for the study. The samples were stored in 0.5% thymol solution. Then, the occlusal enamel was removed and the surface of dentine was etched by phosphoric acid and rinsed with distilled water for 30 s and air dried. The specimens were divided into five groups as follow: chlorhexidine, Quercus extract, chlorhexidine+ Quercus extract, Methanol (solvent of Quercus extract), and control group (without applying specific solution). Following the etch-and-rinse adhesive, the resin composite was placed on the dentin surface. The micro-tensile bond strength (μTBS) of the specimens after three months water storage and 1500-cycle thermocycling was examined. Data were analysed using Multiple T-tests, ANOVA, and SPSS ver.20. Results: Variance analysis and t test showed that the Quercus extract group had the highest bond strength compared to control group, but the difference was not significant. Chlorhexidine showed negative effects on the composite-dentin bond strength. Conclusion: The clinical application of 2% chlorhexidine and Quercus extract could not increase the tensile bond strength of composite resin to dentine.

Keywords: Chlorhexidine, Collagen cross-linking, Microtensile bond strength, Quercus extract

Medical Science, 2020, 24(103), 1168-1175

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