牙体制备形态对Cerec全瓷冠边缘适合性的影响分析  

The effect of tooth preparation design on the CEREC all-ceramic crown's marginal adaptation

作　　者：翁维民[1] 李莹[1] 张富强[1] 

机构地区：[1]上海交通大学医学院附属第九人民医院·口腔医学院口腔修复科,上海市口腔医学重点实验室,上海市口腔医学研究所,上海200011

出　　处：《上海口腔医学》2008年第3期293-296,共4页Shanghai Journal of Stomatology

基　　金：上海市重点(特色)学科建设项目(T0202)~~

摘　　要：目的:观察牙体制备形态对Cerec系统制作的全瓷冠边缘适合性的影响。方法:将标准模型上的下颌第一磨牙制备成2种向聚合度(6°和12°)和2种边缘形态(120°浅凹形边缘和90°直角肩台),分成4个制备体组,每组翻制8个基牙制备体试件。分别用Cerec3设计制作成全瓷冠,用轻重2种硅橡胶材料固定于相应的试件上,剖开后,在体视显微镜下分别测定每个轴面的边缘轻体硅橡胶材料的厚度,用SPSS11.0软件包对结果进行单因素方差分析。结果:4组试件的轻体硅橡胶材料厚度为A组(172.8±42.6)μm,B组(181.9±46.6)μm,C组(187.1±46.5)μm,D组(191.7±46.4)μm,4组之间无显著性差异(P>0.05)。近中面和远中面、近中面和颊面、近中面和舌面、远中面和颊面、远中面和舌面之间均有显著性差异(P<0.05),颊面和舌面之间无显著性差异(P>0.05)。远中面的轻体硅橡胶材料厚度最大为(278.1±28.8)μm,最小的是颊面,为(135.8±14.6)μm。结论:所有修复体的边缘适合性均处于临床可接受的范围内,向聚合度为12°时的边缘适合性优于6°时,120°浅凹形边缘优于直角肩台。PURPOSE： To study the effect of tooth preparation on marginal adaptation of all-ceramic crown designed by the Ceree system. METHODS： Lower first molar in the standard model was prepared into four types, two oeclusal convergences （6° and 12°） and two marginal shapes （chamfer and shoulder）, and then divided into four groups correspondingly with 8 copies of abutment preparation test piece in each group. All-ceramic crown was designed by the Cerec 3 system and inserted with corresponding test piece. Marginal silicon rubber thickness of each axis surface was measured by stereo microscope after dissection. The data were analyzed with SPSS11.0 software package. RESULTS： No significant difference was observed between edge silicon rubber thickness of 4 groups of test pieces （Group A： 172.81μm± 42.61μm,Group B： 181.91μm＋46.61μm,Group C： 187.11μm±46.51μm,Group D： 191.71μm±46.41μm,P〉0.05）. Significant difference was observed between mesial surface and distal surface, mesial surface and buceal surface, mesial surface and lingual surface, distal surface and buceal surface, distal surface and lingual surface （P〈0.05）. No significant difference was observed between buceal surface and lingual surface. Silicon rubber thickness was in the range of 278.11μm±28.81μm and 135.81μm±14.61μm, with that of distal surface the largest （278.11μm±28.81μm） and that of buccal surface the smallest （135.81μm＋14.61μm）. CONCLUSIONS： All the restorations appear to have acceptable marginal adaptability,which suggests that the marginal adaptation of occlusal convergence with 12° is better than 6°, while the marginal design with chamfer is better than shoulder. Supported by Shanghai Leading Academic Discipline Project （Grant No.T0202）.

关 键 词：计算机辅助设计和制作 边缘适合性 牙体制备 

分 类 号：R783[医药卫生—口腔医学]