Immediate and delayed micro-tensile bond strength of different luting resin cements to different regional dentin

作     者：Abdelraheem Mohamed Ali Ibrahim Mohamed Hamouda Mohamed Hamed Ghazy Manal Mohamed Abo-Madina 

作者机构：Department of Conservative Dentistry Faculty of Dentistry Mansoura University Department of Dental Biomaterials Faculty of Dentistry Mansoura University Department of Conservative Dentistry Faculty of Dentistry Umm Al Qura University Crown & Bridge Department of Conservative Dentistry Faculty of Dentistry Mansoura University 

出 版 物：《The Journal of Biomedical Research》 (生物医学研究杂志（英文版）)

年 卷 期：2013年第27卷第2期

页      面：151-158页

学科分类：1003[医学-口腔医学] 100302[医学-口腔临床医学] 10[医学] 

主　　题：immediate and delayed micro-tensile bond strength luting resin cements regional dentin 

摘      要：We sought to evaluate immediate and delayed micro-tensile bond strength of Panavia F2.0 and Multilink Sprint resin cement to superficial, deep and cervical dentin. Thirty-six freshly extracted non-carious human molars were sectioned in the mesiodistal direction to expose three different dentin regions including superficial dentin （1 mm below the dentine-enamel junction）, deep dentin （1 mm above the highest pulp horn） and cervical dentin （0.5 mm above the cemento-enamel junction and 0.5 mm below the dentine-enamel junction）. Resin cements were applied on dentin surfaces and composite blocks were luted under constant seating pressure. Each group was divided into three subgroups according to time intervals. Specimens were sectioned to obtain sticks of 1 mm2 in diameter and subjected to microtensile bond strength testing at a cross head speed of 1 mrn/min. Both resin cements showed higher micro-tensile bond strength to superficial dentin than that to deep or cervical dentin （P 〈 0.001）. Micro-ten- sile bond strengths of Panavia F2.0 were higher than those of Multilink Sprint at different dentin regions （P 〈 0.001）. Immediate ＂micro-tensile bond strengths were higher than those of delayed micro-tensile bond strengths for both resin cements （P 〈 0.001）. It was concluded that resin cements with different chemical formulations and applications yield significantly different micro-tensile bond strengths to different dentin regions.