en ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <p> Background: Antioxidizing agents have recently been suggested to compensate decreased bond<br>strength of resin materials to bleached tooth tissues. This study compared the shear bond strength<br>(SBS) of three different adhesives on bleached dentin immediately after bleaching, bleached/delayed<br>for 1 week, and bleached/applied antioxidizing agent.<br>Materials and Methods: The dentinal surfaces of 132 intact extracted molars were prepared and<br>divided into 12 groups. The following adhesives were investigated: Optibond FL (OFL) (three-step<br>etch-and-rinse), Optibond Solo Plus (two-step etch-and-rinse), and Optibond all-in-one (OA) (onestep<br>self-etch) (Kerr, Orange, USA). Unbleached dentin groups (groups 1-3) were prepared as negative<br>controls (NC). The remainder surfaces (groups 4-12) were bleached with 20% Opalescent PF (Ultradent,<br>USA). Specimens were bonded immediately after bleaching (groups 4-6), after 1 week (groups 7-9), or<br>after using 10% sodium ascorbate (SA) gel (groups 10-12). Subsequent to bonding of composite resin,<br>the samples were tested for SBS and analyzed using Kruskal-Wallis and Mann-Whitney tests (α=0.05).<br>Results: Regarding control groups, OA showed the highest SBS among the studied adhesives<br>(P<0.05). The SBS decreased for the adhesives after bleaching except for OFL. No statistically<br>significant difference in SBS were noted when the SA and delayed bonding groups were compared<br>with their similar NC groups (P>0.05) except the of delay bonding with OA.<br>Conclusions: The findings suggest that bond strength of resin to bleached dentin may be affected<br>with the adhesive system. Reduced SBS to bleached dentin can be amended by the use of SA as<br>an antioxidizing agent. However, the amount of reversed bond strength subsequent to applying<br>antioxidant might be related to the kind of dental adhesive.</p><hr><p></p><p> <strong>Source:</strong> Dental Research Journal</p><p><a href="http://www.drj.mui.ac.ir/index.php/drj/article/view/895"><font color="#0000ff"> Full text</font></a> </p> Antioxidant, bond strength, bleaching, dentin, etch-and-rinse adhesives, self-etch adhesives 0 0 http://idai.ir/browse.php?a_code=A-10-32-379&slc_lang=en&sid=1 Maryam Khoroushi khoroushi@dnt.mui.ac.ir 10031947532846001597 10031947532846001597 Yes Department of Operative Dentistry and Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran Tahereh Saneie 10031947532846001598 10031947532846001598 No Department of Operative Dentistry, School of Dentistry, Isfahan, Iran