fa Does tin pre-treatment enhance the bond strength of adhesive systems to enamel? ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <p> <strong>Objectives</strong></p><p>  The study investigated the modification of composite-to-enamel bond strength by pre-treatment of enamel with a concentrated, acidic SnCl2-solution. </p><p> <strong>Methods</strong></p><p>  Six groups of flat human enamel specimens (n=44 per group) were treated as follows: OB-H: H3PO4 etching, Optibond FL application (primer+adhesive manufacturer's instructions) OB-S: SnCl2 pre-treatment, Optibond FL application (primer+adhesive) OB-HS: H3PO4 etching+SnCl2 pre-treatment, Optibond FL application (primer+adhesive) CF-N: Clearfil SE application (primer+bond manufacturer's instructions) CF-H: H3PO4 etching, Clearfil SE application (primer+bond) CF-S: SnCl2 pre-treatment, Clearfil SE application (primer+bond). Enamel specimens were then built up with resin composite (Clearfil Majesty Esthetic) and stored (100% humidity, 37°C, 1 week). μTBS-measurement and failure mode analysis of one-half of the specimens were performed immediately after storage, while the other half was analysed after a thermocycling procedure (8500 cycles 5°C and 55°C dwell time 30s). Additional specimens were prepared for SEM- and EDX-analysis. </p><p> <strong>Results</strong></p><p>  Highest values were measured for OB-H before and after thermocycling, lowest values for CF-N. Compared to OB-H treatment, OB-S treatment reduced μTBS before/after thermocycling by 23%/28% and OB-HS treatment by 8%/24% (except for OB-SH before (n.s.), all p≤0.001 compared to OB-H). In the Clearfil SE treated groups pre-treatment increased μTBS significantly compared to CF-N (before/after: CF-H: +46%/+70% CF-S: +51%/42% all p≤0.001). </p><p> <strong>Conclusion</strong></p><p>  Pre-treatment with H3PO4 or SnCl2 markedly increased the μTBS of Clearfil SE to enamel. However, thermocycling partly reduced the gain in μTBS obtained by SnCl2 pre-treatment. </p><p> <strong>Clinical significance</strong></p><p>  The application of an acidic and highly concentrated SnCl2 solution is a good option to increase the μTBS between enamel and a resin composite mediated by an adhesive system containing the multifunctional monomer MDP. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry</p><p> <a href="http://www.jodjournal.com/article/S0300-5712(13)00089-4/abstract" target="_blank"><font color="#0000ff">Full Text</font></a></p> Adhesion, Microtensile bond strength, Thermocycling, Stannous chloride 0 0 http://idai.ir/browse.php?a_code=A-10-32-2174&slc_lang=fa&sid=1 Nadine Schlueter 100319475328460010213 100319475328460010213 Yes Department of Preventive, Restorative and Pediatric Dentistry, University of Bern, Switzerland Anne Peutzfeldt 100319475328460010214 100319475328460010214 No Department of Preventive, Restorative and Pediatric Dentistry, University of Bern, Switzerland Carolina Ganss 100319475328460010215 100319475328460010215 No Department of Conservative and Preventive Dentistry, Dental Clinic, Justus Liebig University, Giessen, Germany Adrian Lussi 100319475328460010216 100319475328460010216 No Department of Preventive, Restorative and Pediatric Dentistry, University of Bern, Switzerland