CAJ | 학술논문

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。
목적：평개Er，Cr：YSGG격광비동대리체아설형결손처비우성경화아본질여복합수지간점결성능적영향。방법：선취40개협측경부유설형결손적노년인（60～70세）전마아，수궤분2조（n＝20），분별용Er，Cr：YSGG격광（실험조）화고속와륜아찬（대조조）비동후，용복합수지Filtek Z350진행충전；연후매조각취15개양본제비성점결면적약위1 mm ×1 mm적아령형편상시건，용Instron 5848미력시험궤측정기미랍신점결강도（ MBS）；매조잉여적령5개양본분별연협설향평행우아체장축분성량부분후，용소묘전경관찰점결계면형태。결과：실험조화대조조적MBS（MPa）분별위35．24±7．05화27．56±4．79（P＜0．05）；소묘전경하가견，실험조혼합층교박，부분구역적혼합층、수지돌급아본질소관내적경화결정주긴밀련접재일기。결론：Er，Cr：YSGG격광예비유조우제고노년인비우성경화아본질여복합수지재료간적점결강도。
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 .