Abstract:

Objective:The purpose of this study was to investigate effects of a new silicone rubber impression material on the fit of SDA-Ⅱalloy crowns.Methods:Totally twelve tooth-preparation analogswere divided into sixgroups. Two kinds of impressionma- terial (Jeltrate Exaflex) and a new silicone robber impression material were used. A total of 12 impressionswere obtained from 12 master models with the 1-step technique directly. And then the fitness of SDA-Ⅱalloy crownswas examined. The measurements were recorded at 3 points for a marginal fit and inner fit evaluation respectively.Results:There was no statistically significant dif- ference in marginal open and inner fit of SDA-Ⅱalloy crowns between both impression materials (P>0105).Conclusion:The SDA-Ⅱalloy crown fabricated by using the new impression material yields acceptable marginal fit and inner fit.

Key words: marginal fit, inner fit, silicone impression material