添加＂正圆形标记＂后对印模形变规律的影响

目的 探索添加＂正圆形标记＂后对印模固有形变规律的影响.方法 按美国牙科协会ADA标准,制作两个金属母模,并在其中1个上安置6根横断面为正圆形的钢针.分别对两个金属母模制取印模,获得A、B两组印模样本.用测量显微镜观察、测量标记线,比较两组印模的形变程度及规律.所获数据采用SAS 6.12软件的成组t检验比较.结果 A、B两组印模的形变范围分别为,藻酸盐0.38%～0.58%和0.43%～0.66%;硅橡胶0.38%～0.42%和0.33%～0.49%,两组之间差异无统计学意义（P〉0.05）.结论 在口腔印模上添加正圆形标记点,不会影响印模本身固有的形变规律,该标记方法是可行的.

The effect of impression of the inherent deformation after adding the circular marker on oral impression

Objective To investigate the effect of impression of the inherent deformation after adding the circular marker on oral impression. Methods Two metal molds were made by American Dental Association standards. Six metal circular needles were inserted on one of molds. Two groups of impression sample which named A and B were made by two metal molds. Marker line on the impressions were measured and observed by measuring microscope to compare the impressions (group A and B) with the deformation extent and the deformation law. Croup t test method of SAS6.12 software was adopted to analyze the dimensional changes of the samples. Results The deformation range of two. groups( A and B) of alginate impressions was 0.38% ～ 0.58% and 0.43% ～ 0. 66%. Two groups of silicone impressions' deformation range was 0.38% ～ 0.42% and 0.33% ～ 0.49%. There was no significant difference between the two groups (P > 0.05 ). Conclusion The method with adding markers points on the oral impression would the impression of the inherent deformation. This marking method wag feasible.