4种粘接剂对牙本质粘接强度的体外评价

Bond strength evaluation of four adhesive systems to dentin in vitro

目的比较4种粘接剂对牙本质的粘接强度,并观察粘接界面,评估其抗力性能。方法采用Prime&BondNT(PBNT)、Tetric N-Bond(TNB)、Clearfil SE Bond(CSEB)、G Bond(GB)4种粘接剂粘接树脂于离体下颌第三磨牙的咬合面和近中面,近中面进行剪切力实验,记录断裂峰值;咬合面部分进行微拉伸粘接强度(TBS)测定,扫描电镜观察粘接界面形态。结果在剪切力实验中,PBNT与TNB的抗剪切粘接强度(SBS)最大,两者间差异无统计学意义(P>0.05)。PBNT的SBS高于CSEB与GB(P<0.05);TNB的SBS高于GB(P<0.05),与CSEB的强度差异无统计学意义(P>0.05)。与剪切力实验结果一致,PBNT和TNB的TBS高于CSEB和GB(P<0.05)。扫描电镜下,PBNT和TNB的树脂突比较细长,粘接层较厚;CSEB树脂突短小,GB树脂突更加稀疏。结论全酸蚀粘接剂的粘接强度较自酸蚀粘接剂高,一步法自酸蚀粘接剂强度最低;粘接剂的界面形态与粘接强度存在一定程度的关联性。

Objective To compare the adhesive strength and observe the bonding interface.According to statistic analysis and scanning electron microscope（SEM） observation,the resistance capacity of four adhesive systems is eva-luated.Methods Prime Bond NT（PBNT）,Tetric N-Bond（TNB）,Clearfil SE Bond（CSEB）,G Bond（GB） were bonded to the occlusal surfaces and mesial surfaces of third molars respectively.The mesial resins received shear force expe-riment and the fracture load were recorded.The tensile bond strength（TBS） of the remaining parts were tested.The interfacial configuration were observed under SEM.Results In the shear bond strength（SBS） experiment,PBNT and TNB showed the best result,but there was no significant difference between them（P0.05）.The SBS of PBNT was stronger than that of CSEB and GB（P0.05）.The SBS of TNB was stronger than that of GB（P0.05）.There was no significant difference between TNB and CSEB（P0.05）.In accordance with the shear force result,the TBS of PBNT and TNB was larger than CSEB and GB（P0.05）.Under SEM,resin tags of PBNT and TNB were longer and slender,the bonding layer was thick.Resin tags of CSEB were shorter,the ones of GB were the fewest and shortest.Conclusion Compared to self-etching system,total-etching system could reach better bonding strength.There is some connection between the interfacial configuration of adhesives and bond strength of them.