fa Effect of sodium ascorbate and delayed bonding on the bond strength of silorane and two-step self-etch adhesive systems in bleached enamel ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <b> Background and aims.</b> Studies have shown decreased bond strength of composite resin to human and bovine bleached enamel. This study evaluated the effect of sodium ascorbate and delayed bonding on the bond strength of two adhesive systems to bleached enamel.<div>  <b>Materials and methods.</b> The labial surfaces of 150 sound bovine incisor teeth were abraded with abrasive paper. The teeth were randomly divided into 8 groups: A: control B: bleached with 35% hydrogen peroxide C: bleached with 35% hydrogen peroxide + sodium ascorbate gel and D: bleached with 35% hydrogen peroxide + delayed bonding. In groups A‒D, silorane adhesive system and Filtek silorane composite resin were used. In groups E‒H, the same preparation methods of groups A‒D were used. Two-step self-etch Clearfil SE Bond adhesive systems and AP-X composite resin were administered. Shear bond strength of each group was measured. Two samples were prepared for each surface preparation for ultra-structural evaluation. Two-way ANOVA and Tukey test were used for data analysis at P< 0.05. </div><div><b>Results.</b> The interaction between the adhesive system type and surface preparation protocol was significant (P=0.014), with significant differences in shear bond strengths in terms of the adhesive systems (P< 0.01). There were significant differences in shear bond strength in terms of surface preparation techniques irrespective of the adhesive system (P< 0.01).</div><div><b> Conclusion</b>. The results showed that bleaching with 35% hydrogen peroxide decreased the shear bond strength values with both adhesive systems, and a one-week delay in bonding and 10% sodium ascorbate for 10 minutes restored the bond strength in both adhesive systems.</div><hr><p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><b>Source: </b>Journal of Dental Research, Dental Clinics, Dental Prospects </p> <p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><a href="http://dentistry.tbzmed.ac.ir/joddd/index.php/joddd/article/view/1188" target="_blank"><font color="#0000ff">Full Text</font></a></p> Delayed bonding, enamel bleaching, shear bond strength, silorane-based adhesives, sodium ascorbate 0 0 http://idai.ir/browse.php?a_code=A-10-32-3295&slc_lang=fa&sid=1 Mehdi Abed Kahnemooyi 100319475328460015168 100319475328460015168 No Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran/Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran Amir Amad Ajami 100319475328460015169 100319475328460015169 No Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran Soodabeh Kimyai 100319475328460015170 100319475328460015170 No Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran Fatemeh Pournaghi Azar pournaghiazar@hotmail.com 100319475328460015171 100319475328460015171 Yes Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran Siavash Savadi Oskoee 100319475328460015172 100319475328460015172 No Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran Mohammad Ali Mohammadi torkani 100319475328460015173 100319475328460015173 No Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran