Three-dimensional accuracy of four impression materials for fixed denture
- VernacularTitle:几种常用印模材制取固定义齿模型的三维精度比较
- Author:
Shizhu BAI
;
Yimin ZHAO
;
Xiaolan YE
- Publication Type:Journal Article
- From:
Journal of Practical Stomatology
2001;17(3):239-242
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the three-dimensional accuracy of four impression materials for fixed denture:silicone(OX),hydrocolloid(HT) and two kinds of alginate impression(FC and ZS).Methods:Ten plaster replication models for each impression materials were made on the same metal master cast respectively, vertical and horizontal dimensions between landmarks on the masters and plaster casts were measured with an optical microscope. ANOVA was used to compare the measurements among the materials.Results:The difference between the masters and casts in horizontal distances measured on ZS produced models was bigger than that on other impression material produced ones (P<0.01) and beyond clinical requirment.The difference between the masters and casts in all measured dimensions on OX produced models was the smallest.Conclusion:Alginate paste is not accurate enough for denture model,while silicone is.The hydrocolloid material is relatively accurate.
