fa Combined effect of smear layer characteristics and hydrostatic pulpal pressure on dentine bond strength of HEMA-free and HEMA-containing adhesives ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <p> <strong>Objective</strong></p><p>  This study evaluated the combined effect of smear layer characteristics with hydrostatic pulpal pressure (PP) on bond strength and nanoleakage expression of HEMA-free and -containing self-etch adhesives. </p><p> <strong>Methods</strong></p><p>  Flat dentine surfaces were obtained from extracted human molars. Smear layers were created by grinding with #180- or #600-SiC paper. Three HEMA-free adhesives (Xeno V, G Bond Plus, Beautibond Multi) and two HEMA-containing adhesives (Bond Force, Tri-S Bond) were applied to the dentine surfaces under hydrostatic PP or none. Dentine bond strengths were determined using the microtensile bond test (μTBS). Data were statistically analyzed using three- and two-way ANOVA with Tukey post hoc comparison test. Nanoleakage evaluation was carried out under a scanning electron microscope (SEM). </p><p> <strong>Results</strong></p><p>  Coarse smear layer preparation and hydrostatic PP negatively affected the μTBS of HEMA-free and -containing adhesives, but there were no significant differences. The combined experimental condition significantly reduced μTBS of the HEMA-free adhesives, while the HEMA-containing adhesives exhibited no significant differences. Two-way ANOVA indicated that for HEMA-free adhesives, there were significant interactions in μTBS between smear layer characteristics and pulpal pressure, while for HEMA-containing adhesives, there were no significant interactions between them. Nanoleakage formation within the adhesive layers of both adhesive systems distinctly increased in the combined experimental group. </p><p> <strong>Conclusion</strong></p><p>  The combined effect of coarse smear layer preparation with hydrostatic PP significantly reduced the μTBS of HEMA-free adhesives, while in HEMA-containing adhesives, these effects were not obvious.</p><p> <strong> Clinical significance</strong></p><p>  Smear layer characteristics and hydrostatic PP would additively compromise dentine bonding of self-etch adhesives, especially HEMA-free adhesives. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry</p><p><a href="http://www.jodjournal.com/article/S0300-5712(13)00171-1/abstract" target="_blank"><font color="#0000ff"> Full Text</font></a></p> Dentine bond strength, One-step self-etch adhesives, HEMA, Hydrostatic pulpal pressure, Smear layer characteristics 0 0 http://idai.ir/browse.php?a_code=A-10-32-2201&slc_lang=fa&sid=1 Mohd Haidil Akmal Mahdan 100319475328460010353 100319475328460010353 No Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima Bunkyo ku, Tokyo 113-8549, Japan Masatoshi Nakajima 100319475328460010354 100319475328460010354 Yes Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima Bunkyo ku, Tokyo 113-8549, Japan Richard M. Foxton 100319475328460010355 100319475328460010355 No Department of Restorative Dentistry, Floor 25, King's College London Dental Institute, King's College London, London Bridge, London SE1-9RT, United Kingdom Junji Tagami 100319475328460010356 100319475328460010356 No Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima Bunkyo ku, Tokyo 113-8549, Japan