en ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <p> <strong>Objectives</strong> The purpose of this study was to evaluate the effect of waiting interval on the chemical activation of dual-cure one-step self-etching adhesives before placing resin core materials on the regional bond strength to root canal dentin. </p><p> <strong>Materials and methods</strong> Forty-eight post spaces prepared in human lower premolars were applied with four dual-cure one-step self-etching adhesives Estelite Core Quick: ECB/ECQ, Clearfil DC Core Automix: CDB/CDC, Unifil Core EM: UNB/UNC, BeautiCore: BTB/BTC as the manufacturers’ instructions. These adhesives were cured with light activation for 10s, or chemical activation with 0, 10, and 30s waiting intervals prior to placing resin core material. Resin core materials were then placed into the post space and light-cured for 60s. After 24h water storage, each specimen was serially sliced into 8, 0.6mm×0.6mm thick beams for the μTBS test. The regional μTBS data were analyzed using three-way ANOVA and Dunnett's T3 test (p<0.05). </p><p> <strong>Results</strong> For the chemical activation with 10 and 30s waiting intervals, ECB and CDB exhibited significantly improved μTBS, whereas for UNB and BTB, the μTBS were not significantly different but increased with waiting interval. On the other hand, light-activation of all the adhesives produced significantly higher μTBS to root canal dentin than chemical activation (p<0.05), except for the UNB group. </p><p> <strong>Conclusions</strong> For the chemical activation of dual-cure one-step self-etching adhesives, a waiting interval prior to placing resin core material improved μTBS to root canal dentin. Polymerising the adhesives before polymerisation reaction of resin core material would be effective for bonding to root canal dentin. Clinical relevance For chemical activation mode as well as light activation mode, pre-curing of adhesive layer before proceeding polymerisation of resin filling material would produce higher bonding performance to dentin in the cavity. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry </p><p><a href="http://www.jodjournal.com/article/S0300-5712(12)00264-3/abstract"><font color="#0033ff"> Full Text</font></a> </p> Dual-cure adhesive, One-step self-etching adhesive, Resin core system, Polymerisation activation mode, Micro-tensile bond strength, Root canal dentin 0 0 http://idai.ir/browse.php?a_code=A-10-32-831&slc_lang=en&sid=1 Suppason Thitthaweerat 10031947532846003635 10031947532846003635 Yes Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan Masatoshi Nakajima 10031947532846003636 10031947532846003636 No Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan Richard M. Foxton 10031947532846003637 10031947532846003637 No Division of Conservative Dentistry, King's College London Dental Institute at Guy's, King's and St Thomas’ Hospitals, King's College London, Floor 25, London Bridge, London SE1-9RT, UK Junji Tagami 10031947532846003638 10031947532846003638 No Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan