自酸蚀粘接剂混合后延迟应用对粘接强度的影响

Effects of delayed application of mixed self-etching bonding agent on the tensile bond strength

目的:评价"二瓶装、一步法"自酸蚀粘接剂混合后延迟应用对粘接强度的影响。方法:去除磨牙面釉质,等分暴露的牙本质面,其中一个半面用即刻混合的"二瓶装、一步法"自酸蚀粘接剂(Adper Prompt、XenoIII)进行粘接,另一个半面用混合后放置一段时间(0.5、1、2、3、4、5、6h)的自酸蚀粘接剂进行粘接。然后制备用于粘接强度测定及粘接界面观察用的条状试样并进行测定。结果:AdperPrompt混合后5h以内应用,粘接强度无明显变化;XenoIII混合后3h以内应用,粘接强度无明显变化。结论:"二瓶装、一步法"自酸蚀粘接剂混合后的可使用时间是有限的,不同粘接剂的可使用时间是不同的。

Objective：To evaluate the influence of delayed application of mixed self-etching bonding agent on the tensile bond strength.Methods：Two ＂two-bottle,one-step＂ self-etching adhesives,Adper Prompt and Xeno Ⅲ,were evaluated.The occlusal enamel of human third molar was cut out and the exposed dentin surface was divided in two halves by a 1 mm deep groove in the labial-lingual orientation to allow for evaluation of immediate application and delayed application（0.5,1,2,3,4,5 and 6 h） of mixed self-etching bonding agent in the same specimen,followed by composite resin built-up on the adhesive.The bonded specimens were sectioned into beams of approximately 0.9 mm^2 and subsequently subjected to micro-tensile bond strength testing at a crosshead speed of 1.0 mm/min.Results：The specimens bonded with the Adper Prompt within 5 h after mixing showed no different and that with the Xeno III within 3 h after mixing showed no different.Conclusion：The effective period for ＂two-bottle,one-step＂ self-etching adhesives after mixing is limited.Different bonding agents have different effective periods.