摘要
目的三维评价藻酸盐类、缩合硅橡胶类、聚醚橡胶类3种牙科印模材料的取模精度。方法以猴牙列为标准模型,分别采用3种印模材料制取猴上、下颌牙列各10付石膏模型,用三维照相式扫描仪扫描标准模型及石膏模型,提取石膏模型扫描图像与标准模型图像进行拟合,获取设定牙列截面体的体积并对所得数据进行统计分析,观察不同印模材料制取印模与标准模型之间三维形态偏差分布的规律。结果与标准模型扫描图像相比较,3种印模材料翻制石膏模型后扫描图像的截取体积平均变化率分别为-5.84%、-3.21%、-0.63%,藻酸盐组与缩合硅橡胶组、聚醚橡胶组截面体积差异有统计学意义(P<0.05),聚醚橡胶组与标准模型最接近,其次是缩合硅橡胶组和藻酸盐组,聚醚组(P>0.05)、缩合硅橡胶组(P>0.05)在上、下颌体积变化率无统计学差异,而藻酸盐组则有统计学差异(P<0.05)。拟合图像最大偏差出现在牙颈部与牙龈组织接触的部位。结论3种印模材料制取石膏模型与标准原型相比较体积均变小,聚醚橡胶类印模材料的取模精度要优于缩合硅橡胶类,缩合硅橡胶类要优于藻酸盐类印模材料,牙颈部与牙龈组织接触的部位取模误差较大。
Objective To evaluate the accuracy of 3 impression materials in reproductions of simian dental arches using a 3-dimensional optical digitizer.Methods Two simian dental arches were prepared as the master models.Impressions were made for stone casts using three impression materials,including alginate impression materials,C-silicone materials and Impregum-Penta polyether rubber.Five plaster replication models for each master model,as well as for each impression materials were made.The master models and the casts were digitized using a 3-dimensional optical scanner and digitizer.The images of each plaster cast and its original master model were superimposed to obtain the setting cross-section volume of the dental crown.The ratios of the plaster cast volume change and discrepancy distribution patterns were analyzed.Results Compared with the volume of the master models,the discrepancies of the plaster casts volume were-5.84%,-3.21%,and-0.63% for alginate impression materials,silicone materials and Impregum-Penta polyether rubber,respectively.The discrepancy between the master models and casts from alginate material was statistically significant（P〈0.05）,but not for silicone materials or Impregum-Penta polyether rubber.Maximal deviation of image fitting was located in the cervix and the gingival areas.Conclusions The volumes of all the plaster casts from the 3 impression material are smaller than that of the master model.Impregum-Penta polyether rubber allows the most precise and silicone material the relatively accurate reproduction of the denture model,while alginate can not.The major error areas are in the dental cervix and gingival region.
出处
《南方医科大学学报》
CAS
CSCD
北大核心
2010年第2期257-259,共3页
Journal of Southern Medical University
基金
国家自然科学基金(30801307)
关键词
牙科印模材料
三维光学扫描系统
三维精度
dental impression material
3D optical scanning
three-dimensional accuracy
