洞缘角度对树脂充填后微渗漏的影响  

The experimental study of resin fillings micro leakage of different angles of cavity margins

作　　者：杜礼安[1] 张立亮 马莉[1] 王敬红[1] 

机构地区：[1]唐山职业技术学院口腔系,河北省唐山063000 [2]唐山古冶三和齿科

出　　处：《中国基层医药》2012年第24期3691-3692,3841,共3页Chinese Journal of Primary Medicine and Pharmacy

基　　金：河北省唐山市科技攻关项目（12140210A-8）

摘　　要：目的探讨不同角度洞缘斜面对复合树脂充填后微渗漏的影响。方法30颗离体磨牙随机分为三组，每组10颗牙，分别制备1mm长的洞缘斜面及45°、70°、90°的洞缘角，并用Prime＆BondNT粘结剂及复合树脂直接进行树脂充填修复。经500次冷热循环后行印度墨水染色1周，体视显微镜下观测各充填体边缘微渗漏的长度。结果70。洞缘角染料渗入最少，与45°、90°洞缘角差异均有统计学意义（t=3．530、4．179，均P〈0．05）。结论为了预防树脂微渗漏的发生，应该将洞缘角设计成70°的短斜面。Objective To study the effects of resin micro-leakage of different angles of cavity margins with composite resin filling. Methods Thirty extracted human molar with ocelusal surfaces preparing hole into 3mm x 3mm x 3mm. Specimens were randomly divided into 3 groups, 1 mm slopes of cavity margins were designed respective- ly, and three kinds of angles of cavity margins （45°, 70°, 90°） were filled on the occlusive surfaces, then using Prime＆Bond NT and Composite resin （ChrismaA2） to repair the holes directly. After 500 thermal cycliug, all speci- mens were immersed in Indian ink for one week and the penetration depth was examined under stereo microscope. Results Cavity margin angles of 70° was better than those of 90° and 45°, the results was statistically significant （ t = 3. 530,4. 179, all P 〈 0. 05 ）. Conclusion To reduce the occurrence of the resin micro-leakage, cavity margin angles should be designed as short slant with an angle of 70° or so.

关 键 词：磨牙 复合树脂 渗漏 染色 

分 类 号：R783[医药卫生—口腔医学]