Er,Cr:YSGG激光对老年人非龋性硬化牙本质粘结强度的影响  

Effect of Er,Cr: YSGG laser on the Bonding strength of the elderly non-carious sclerotic dentin

作　　者：刘艳[1] 付强[1] 葛志华[1] 贾兴亚[2] 

机构地区：[1]承德医学院附属医院口腔科,河北承德067000 [2]中国医科大学口腔医学院干诊科,辽宁沈阳110002

出　　处：《牙体牙髓牙周病学杂志》2014年第9期530-533,共4页Chinese Journal of Conservative Dentistry

摘　　要：目的：评价Er，Cr：YSGG激光备洞对离体牙楔形缺损处非龋性硬化牙本质与复合树脂间粘结性能的影响。方法：选取40个颊侧颈部有楔形缺损的老年人（60～70岁）前磨牙，随机分2组（n＝20），分别用Er，Cr：YSGG激光（实验组）和高速涡轮牙钻（对照组）备洞后，用复合树脂Filtek Z350进行充填；然后每组各取15个样本制备成粘结面积约为1 mm ×1 mm的哑铃形片状试件，用Instron 5848微力试验机测定其微拉伸粘结强度（ MBS）；每组剩余的另5个样本分别沿颊舌向平行于牙体长轴分成两部分后，用扫描电镜观察粘结界面形态。结果：实验组和对照组的MBS（MPa）分别为35．24±7．05和27．56±4．79（P＜0．05）；扫描电镜下可见，实验组混合层较薄，部分区域的混合层、树脂突及牙本质小管内的硬化结晶柱紧密连接在一起。结论：Er，Cr：YSGG激光预备有助于提高老年人非龋性硬化牙本质与复合树脂材料间的粘结强度。AIM：To evaluate the effect of Er , Cr：YSGG laser preparation on the bonding properties be-tween composite resin and the the sclerotic dentin of elderly subjects .METHODS：40 extracted premolars with cervi-cal wedge-shaped defect and sclerotic dentin on the surface from 60~70 year-old people were randomly divided into 2 groups （n=20）.In the experimental group Er,Cr：YSGG laser was used for cavity preparation , in the control group regular burs with high-speed turbines was used for cavity preparation .The cavies of all teeth were filled with composite resin Filtek Z350.15 samples in each group were cut into dumbbell-shaped specimens with a bonding area of 1 mm2 . The micro-tensile bond strength （MBS） was tested on Instron 5848 Micro Tester.Each tooth of the remaining 5 sam-ples in each groupe were divided into two parts along buccolingual directions parallel to the long axis of the tooth .The bonding interface was observed by SEM .RESULTS： The MBS （ MPa ） of experimental and control groups was （35.24 ±7.05）MPa and（27.56 ±4.79）MPa respectively（P〈0.05）.SEM observation showed that hybrid layer be-tween sclerotic dentin and composite resin was thinner in experimental group , resin tags, and crystallizing column with-in dentinal tubules connected together tightly .CONCLUSION：Er,Cr：YSGG laser preparation can improve the bond strength between elderly non-carious sclerotic dentin and composite resin .

关 键 词：Er Cr:YSGG激光 微拉伸粘结强度 老年人 非龋性硬化牙本质 复合树脂 

分 类 号：R780.5[医药卫生—口腔医学]