两种硅橡胶印模制取技术对种植模型精确性的影响比较

Comparison of two types of silicone impressions on accuracy of implant model

目的探讨2种硅橡胶印模制取技术对种植模型精确性的影响。方法分别采用机混式硅橡胶与手混式硅橡胶印模制取技术，制取标准口腔种植基桩模型的印模各15个，灌制成超硬石膏模型，比较所取印模对种植基桩精度上的差异。结果在颈缘精度上2种硅橡胶印模制取技术制取的模型比较有显著差异；在种植基桩高度、直径、肩台宽度上2种印模制取技术制取的模型比较无显著差异。结论这2种印模制取方法制取的模型均具有理想的精确性，但在固定烤瓷修复中对模型颈缘精确度要求颇高，不适宜使用机混式硅橡胶印模制取技术；手混式印模技术也可以应用于固定修复、活动义齿、种植转移模型获取等方面。

Objective To compare the different accuracy of implant model made by the two types of silicone impressions. Methods Fifteen impressions of standard abutment were made separately by machine-mixed and hand-mixed, then made into super-stone models and the accuracy of the different im- pressions was compared. Results The two types of silicone impressions showed significant difference of the margin precision, while differences on the height, diameter and the width of abutment shoulder were not found. Conclusions The two methods both have ideal accuracy, but porcelain- fused-to-metal restora- tions require high accuracy of the model shoulder, which is not suitable to use machine-mixed silicone im- pression technology, and hand-mixed method can be used in fixed restoration, removable denture and im- plant level impression.