Comparison of Dentin Microshear Bond Strength of Chlorhexidine on Two Step Self-etch Adhesives with and without Fluoride after 6-month storage in water

Document Type : Original Article

Authors

1 Assistant professor of Odontología Operativa.Department of Odontología Operativa, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

2 Resident of Odontología Operativa.Department of Odontología Operativa, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

3 Assistant Professor of Odontología Operativa.Department of Odontología Operativa, Faculty of Dentistry, University of Medical Sciences Kohgiluyeh Boyer Ahmad, Yasouj, Iran.

Abstract

Background and Objective: Regarding the possible leakage of the bacteria in the cavity; the use of antibacterial agents such as chlorhexidine in the adhesive restorations has been proposed. However, the effect of this process on the long-term bond strength to the dentin has not been studied completely. This study assessed the effects of chlorhexidine on the dentine micro-shear bond strength of two-stage self-etch adhesives with and without fluoride after 6-month storage in water.
Subjects and Methods: In this in vitro study, 40 extracted human mandibular third molars were obtained and after dentin exposure and polishing with silicone carbide for standard smear layer preparation; they were assigned into 4 groups. With or without using chlorhexidine adhesives of Clearfil SE Bond and Clearfil Liner Bond F were applied to the dentin surface and the teeth were restored with Z250 composite. The teeth were incubated for 6 months at 37 °C temperature and 100% moisture and received 1000 thermal cycles. The microshear bond strength of the specimens was determined and their fracture patterns were determined by streomicroscope. The data were analyzed by one-sided analysis of variances test while the paired comparisons were done by Tukey test. 
Results: Application of chlorhexidine at dentin surface since performing by adhesive sel-fetch did not cause any seriouse adverse effects on bond strength. Mean±standard deviation of the bond strength values with and without the application of chlorhexidine for the Clearfil SE Bond were 20.66±3.27 and17.48±7.11 MPa. The figures were 31.63±7.33  and 31.42±11.39 MPa for Clearfil Liner Bond F adhesive (P>0/05).
Conclusion:Because of antibaterial effect of chlorhexidine and having no negative effect on bond strength; surface preparation with this agent beside using fluoride-containing adhesives is suggested to eradicate the existing bacteria and decreases microleakage in the clinical condition without compromising bond strerngth.

Keywords

References

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Jundishapur Scientific Medical Journal
Volume 15, Issue 3 - Serial Number 102
July and August 2017
Pages 261-270

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  • Receive Date: 20 June 2017
  • Accept Date: 20 June 2017

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