全冠边缘间隙影响因素的多元线性回归分析  

Factors Influencing Marginal Fit of Crowns after Cementation:A multiple Linear Regression Analysis

作　　者：章少萍[1] 马守治[1] 陈熙[1] 童新文[1] 李秀容[2] 张维文[2] 

机构地区：[1]福建医科大学附属口腔医院修复科,福州福建350002 [2]福建医科大学附属口腔医院技工中心

出　　处：《口腔医学研究》2011年第4期340-342,共3页Journal of Oral Science Research

基　　金：福建省自然科学基金项目(编号:2009J01142)

摘　　要：目的:评价多种因素对粘固后全冠边缘间隙(marginal discrepancies of crowns after cementation,MDAC)的影响,这些因素包括预备体完成线形态(finish line of preparation,FLP)、预备体轴壁倾斜角(taper angle of axial wall of preparation,TAAWP)、预备体高度(height from occlusal surface to ends of preparation,HP)、粘固前的全冠边缘间隙(marginal discrepancies of crowns before cementation,MDBC)以及粘固剂的粉液比例(powder/liquid ra-tios of cement,PLRC)。方法:制作24种不同设计形式的预备体不锈钢代型,每种形式制作10个,总共制作240个金属代型。在每个代型上制作一个金属冠。在同一种代型上制作的10个金属冠中的5个采用粉液比2g∶1g调和的玻璃离子粘固,另5个用3g∶1g比例调和的玻璃离子进行粘固。测量粘固前后的全冠边缘间隙。采用多元线性回归方法分析前面提到的多个变量是否会对粘固后的全冠边缘间隙产生影响。结果:粘固后全冠边缘间隙显著提高。多元线性回归分析表明FLP、TAAWP、HP、MDBC以及PLRC共同影响粘固后的全冠边缘间隙。结论:同FLP和MDBC相比,TAAWP、HP和PLRC对粘固后的全冠边缘间隙的影响则更加显著。Objective：To evaluate the influence of various factors,including finish lines of preparations（FLP）,taper angles of axial walls of preparations（TAAWP）,height from occlusal surfaces to ends of preparations（HP）,marginal discrepancies of crowns before cementation（MDBC）,and powder/liquid ratios of cement（PLRC） on the MDAC.Methods：Twenty-four preparation designs of steel dies were machined,and ten dies were fabricated for every design.A total of 240 metal crowns were fabricated on the metal dies.Five of the ten crowns fabricated on the same design of die was cemented on its die with glass ionomer cement at a powder/liquid ratio of 2g/1g,while the others were cemented on its die at a powder/liquid ratio of 3g/1g.Marginal discrepancies were evaluated before and after cementation.Multiple linear regression analysis was used to determine whether the independent variables mentioned above had an impact on the MDAC.Results：Marginal discrepancies increased significantly after cementation.The backward multiple regression analysis showed that the FLP,TAAWP,HP,MDBC,and PLRC were jointly predictives of the MDAC.Conclusion：The FLP and MDBC may have a weak influence on the MDAC,while the TAAWP,HP and PLRC impact MDAC more significantly.

关 键 词：全冠 边缘适合性 多元线性回归分析 

分 类 号：R783.3[医药卫生—口腔医学]