两种方法制取固定义齿印模的临床评价

Clinical evaluation of two types of fixed partial denture impressions

目的对藻酸盐印模法和琼脂/藻酸盐联合印模法制取固定义齿印模的效果进行临床评价。方法将237例固定义齿患者分为A、B组,A组81例患者207颗基牙,采用藻酸盐印模法制取印模;B组156例患者392颗基牙,采用琼脂/藻酸盐联合印模法制取印模。用放大镜观察两组印模,记录基牙数目、印模缺陷类型与数目。结果藻酸盐印模中有118颗(57.0%)基牙存在缺陷,琼脂/藻酸盐联合印模法中有141颗(36.0%)基牙存在缺陷,二者存在显著性差异(P<0.05)。在颈缘气泡、龈沟及肩台不清晰两个方面,两种印模法存在显著性差异(P<0.05)。在颈缘处的撕裂或缺损方面,两种印模法无显著性差异。结论琼脂/藻酸盐联合印模法较藻酸盐印模法制取的印模缺陷少。

Objective To evaluate the clinic effects of alginate impression and agar/alginate combined impression. Methods 237 patients of fixed partial denture were collected and divided into group A and group B. Group A was taken impression by aglinate impression, including 81 patients （207 abutments）. Group B was taken impression by agar/alginate combined impression, include 156 patients（392 abutments）. The impressions were observed by megaloscope, and the number of abutment, the types and number of defect were recorded. Results In the aglinate impressions, 57.0 percent of abutment had some defect. But in the agar/alginate combined impressions, 36.0 percent of abutment had some defect. There were significant difference between group A and group B in the abutment, air bub- bles in cervical margin, unsharpness of the gingival sulcus and shoulders （P〈0.05）. There were no significant difference between group A and group B in the split and defect of the impressions on the cervical margin. Conclusion There were less defects in the agar/alginate combined impression than in the alginate impression.