粘接处理剂对自粘接树脂水门汀和RMGIC的牙本质粘接强度的影响

摘要

目的:实验评价牙本质粘接处理剂对自粘接树脂水门汀和树脂加强型玻璃离子水门汀(RMGIC)的牙本质微拉伸粘接强度的影响.方法:选用离体人无龋第三恒磨牙24颗,用低速切片机垂直于牙体长轴方向将磨牙冠(牙合)中1/3交界线处切开待用.实验组牙本质表面涂布牙本质粘接处理剂,对照组不涂粘接处理剂.后将试样分别用自粘接树脂水门汀(Unicem,3M ESPE;seT PP,SDI)或树脂加强型玻璃离子水门汀(Fuji CEM,GC)原位对位粘接.水浴中储存24h后,用低速切片机把样本切割成约1mm×1mm×8mm条状,随后进行微拉伸测试.用扫描电镜观察粘接界面形貌.结果:无论是否使用粘接处理剂,Unicem的牙本质粘接强度显著高于seT PP 和Fuji CEM(P <0.01).与对照组相比,实验组的粘接强度显著提高(P <0.05).结论:粘接处理剂表面处理增强自粘接树脂水门汀及树脂加强型玻璃离子水门汀的牙本质粘接强度.%Objective: The aim of this study was to investigate the effects of dentin bonding agents on the micro-tensile dentin bond strengths (mTBS) of self-adhesive resin cements and resin-modified glass ionomer cement (RMGIC). Methods: Twenty-four non-carious humane third molars were used for the study. The crowns were cut into two with a low-speed saw (Isomet) along the line between occlusal one third and middle one third of crowns, perpendicularly to tooth long axis in order to expose the dentin surfaces of both sectioned sides. The sectioned dentin surfaces were treated with or without dentin primer (control). Subsequently, the sectioned dentin surfaces were glued together in situ either with one of two resin cements (Unicem, 3M ESPE; seT PP, SDI) or with RMGIC (Fuji CEM; GC). After 24h water storage, all specimens were sectioned into beams about 1 × 1 × 8mm consistently with the axis of the teeth, followed by μTBS tests with micro-tensile tester. The micro-morphologies of the debonded cement-dentin interfaces were analyzed by SEM. Results: Unicem possessed significantly higher dentin bond strength than seT PP and Fuji CEM, regardless of the utilization of dentin primer (P<0.01). Compared to the control group, the dentin bond strengths of self-adhesive cements (Unicem, seT PP) and RMGIC (Fuji CEM) were significantly increased when dentin primerwas applied (P<0.05). Conclusions: The pretreatment with dentin primer could significantly improve the dentin bond strengths of self-adhesive cements and RMGIC.