三种不同处理方法对老年牙本质与复合树脂间微拉伸粘结强度的影响  

Influence of Three Different Treating Methods on Strength of Microtensile Bond Between Composite Resin and Aged Dentin

作　　者：安欣[1] 贾兴亚[1] 

机构地区：[1]中国医科大学口腔医学院干诊科,沈阳市110002

出　　处：《中国激光医学杂志》2012年第6期358-361,417,共5页Chinese Journal of Laser Medicine & Surgery

基　　金：辽宁省医学高峰建设工程重点科研项目(200909)

摘　　要：目的比较三种不同方法处理后,老年牙本质与复合树脂间微拉伸粘结强度以及牙本质微观形态的差异。评价Er,Cr∶YSGG激光用于老年人窝洞预备及蚀刻对粘结效果的影响。方法收集完整无龋坏的65岁以上老年人磨牙27颗,随机分成3组。A组:传统牙钻预备+自酸蚀;B组:4 W Er,Cr∶YSGG激光预备+自酸蚀;C组:4 W Er,Cr∶YSGG激光预备+1.5 W Er,Cr∶YSGG激光蚀刻,各组均采用Z350复合树脂充填,37℃水浴中储存24 h后,进行微拉伸粘结强度测试。每组随机选取3颗离体牙标本,扫描电镜下观察老年牙本质微观结构。结果各组微拉伸粘结强度值,B组最高(26.14±4.83)MPa,A组次之(24.68±5.56)MPa,A、B组比较差异无显著意义(P>0.05)。C组最低(20.14±3.38)MPa,与A、B组比较差异均有显著意义(P<0.05)。结论 Er,Cr∶YSGG激光用于老年牙本质窝洞预备可获得较理想的粘结效果,Er,Cr∶YSGG激光单独用于老年牙本质蚀刻会降低其粘结强度,尚需结合其他牙本质处理方法。Objective To compare the strengths（μTBS） of microtensile bond between composite resin and aged dentin and the microstructures of the aged dentin after they are treated differently.To evaluate how preparing and etching aged dentin with Er,Cr∶ YSGG laser will impact the bonding results. Methods Altogether 27 molars extracted from elderly people over the age of 65 were selected and divided into three groups randomly： Group A： bur ＋ self-etching adhesive,Group B： 4W Er,Cr∶ YSGG laser ＋ self-etching adhesive and Group C： 4W Er,Cr∶ YSGG laser＋1.5W Er,Cr∶ YSGG laser.All the subjects were filled with composite resin（Z350） and kept in distilled water for 24 hours at 37℃.They were then cut into hourglass-shaped specimens and evaluated for microtensile bond strength.The microstructure of dentin surface was observed with SEM. Results Group B yielded the highest μTBS,（26.14±4.83） MPa.The μTBS of Group A was（24.68±5.56） MPa.Group C had the lowest μTBS,i.e.,（20.14±3.38）MPa.While both the differences（P〈0.05） between Group A and C and between Group B and C being statistically significant,that between Group A and B was not great（P〈0.05）. Conclusions Preparing aged dentin with 4W Er,Cr∶ YSGG laser may yield desired bonding results,but etching aged dentin with 1.5W Er,Cr∶ YSGG laser will affect negatively the bond between composite resin and aged dentin.

关 键 词：激光 老年牙本质 蚀刻 微拉伸 扫描电镜 

分 类 号：R781.1[医药卫生—口腔医学]