Reddy MSC, Mahesh MC, Bhandary S, Pramod J, Shetty A. Evaluation of
Effect of Different Cavity Disinfectants on Shear Bond Strength of
Composite Resin to Dentin using Two-Step Self-Etch and One-Step
Self-Etch Bonding Systems: A Comparative in vitro Study. J Contemp Dent
Pract 2013;14(2):275-280.
Abstract
Aim and objectives: To evaluate the
effect of 2% chlorhexidine, 2% sodium hypochlorite, 3% hydrogen peroxide
on shear bond strength of composite resin to dentin using two-step and
onestep self-etch bonding systems and to study the mode of failure of
specimens under stereomicroscope. Materials and methods: Eighty
extracted sound human posterior teeth were used. The occlusal surfaces
were ground to expose the dentin and were then randomly divided into 4
main groups. In group I, no cavity disinfectant was used and served as
control. In groups II, III, IV, 2% chlorhexidine, 2% sodium hypochlorite
and 3% hydrogen peroxide were used as cavity disinfectants
respectively. Each group was then divided into two subgroups of 10 teeth
each according to the bonding agent used, two-step self-etch (Adper SE
Plus) and one-step self-etch (Adper Easy One) respectively. A
transparent cylindrical plastic tube was loaded with microhybrid
composite and placed over the dentin and light cured for 40 seconds. The
specimens were subjected to shear stress in the universal testing
machine. Results: Pretreatment with 2% chlorhexidine, 2% sodium
hypochlorite and 3% hydrogen peroxide, had a negative effect on the
shear bond strength of self-etching bonding systems. Conclusion: The
highest bond strength was found in 2% chlorhexidine group followed by 2%
sodium hypochlorite group and the lowest bond strength was found in 3%
hydrogen peroxide group. Clinical significance: All three cavity
disinfectants used in this study reduced the shear bond strength and
hence should be used with caution.
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