同向施压测定自酸蚀与全酸蚀粘接系统粘接强度

Determinations of the bonding strength with pressure in the same direction for two enamel adhesion techniques:self-etching and all-etching

目的:比较自酸蚀和全酸蚀粘结系统对牙釉质的剪切粘结强度,为临床选择粘结术式提供依据。方法:取近期拔除人上中切牙10颗,轴向纵切,一分为二,分别进入实验组和对照组。一组用Single BondTM2粘结FiltekTMZ250树脂;另一组用SE Bond粘结FiltekTMZ250树脂。所有试件按自切端向颈部施压法测定剪切粘结强度。结果:Single BondTM2对牙釉质的剪切粘结强度大于SE Bond,二者的差异有统计学意义(P<0.01)。结论:全酸蚀粘结系统对牙釉质的粘结剪切强度大于自酸蚀系统,临床上对牙釉质的粘结应选择全酸蚀技术,采用自切端向颈部的方向施压的原则测定试件的剪切粘结强度更具有科学性。

Objective： To compare the shear strength of the self-etching techniques and the all-etching techniques for enamel adhesion and to provide evidence for the selection of different bonding methods in clinical practice. Methods： Ten middle incisors recently extracted were collected,each was cut into two parts following its sagittal axis,thus divide each tooth into two groups.For group 1 Single Bond^TM 2 was used to bond Filtek^TM Z250 resin to the teeth.For group 2,SE Bond was used to bond Filtek Z250 resin to the teeth.After that,according to the principle of pressing from the incisal margin to the cervix,the shear strength of each bonding unit was tested and statistically analyzed. Results： The shear strength of Single Bond^TM 2 was significantly higher than that of SE Bond（P〈0.01）. Conclusion： All-etching bon-ding system can provide higher shear strength for enamel bonding than that of self-etching bonding system.It is suggested that all-etching technique should be selected for dental restoration with resin.