Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Effects of applying antioxidants on bond strength of bleached bovine dentin

  • Whang, Hyo-Jin (Department of Conservative Dentistry, Dankook University Graduate School and Institute of Dental Science) ;
  • Shin, Dong-Hoon (Department of Conservative Dentistry, Dankook University College of Dentistry and Institute of Dental Science)
  • Received : 2014.07.14
  • Accepted : 2014.09.01
  • Published : 2015.02.28
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Abstract

Objectives: Some antioxidants are believed to restore dentin bond strength after dental bleaching. This study was done to evaluate the influence of antioxidants on the bond strength of bleached bovine dentin. Materials and Methods: Thirty incisors were randomly assigned to 10 groups (two unbleached control and eight bleached groups:immediate bonding IB, 4 wk delayed bonding DB, 10% sodium ascorbate treated SA, 10% ${\alpha}$-tocopherol treated TP groups). Teeth in half of groups were subjected to thermal stress, whereas the remaining groups were not. Resin-dentin rods with a cross-sectional area of $2.25mm^2$ were obtained and microtensile bond strength was determined at a crosshead speed of 1 mm/min. Fifteen specimens were prepared for SEM to compare the surface characteristics of each group. The change in dentin bond strength from thermal stress and antioxidant treatment was evaluated using two-way analysis of variance (ANOVA) and Sheffe's post hoc test at a significance level of 95%. Results: The control group exhibited the highest bond strength values, whereas IB group showed the lowest value before and after thermocycling. The DB group recovered its bond strength similar to that of the control group. The SA and TP groups exhibited similar bond strength values with those of the control and DB groups before thermocycling. However, The TP group did not maintain bond strength with thermal stress, whereas the SA group did. Conclusions: Applying a 10% sodium ascorbate solution rather than 10% ${\alpha}$-tocopherol solution for 60 sec is recommended to maintain dentin bond strength when restoring non-vitally bleached teeth.

Keywords

References

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