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The Accuracy of Master Cast for Implant Prosthesis According to the Types of Impression Tray and Splinting Methods of Impression Copings  

Lee, Jee-Hyuk (Department of Prosthodontics, College of Dentistry, Dankook University)
Choi, Yu-Sung (Department of Prosthodontics, College of Dentistry, Dankook University)
Cho, In-Ho (Department of Prosthodontics, College of Dentistry, Dankook University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.26, no.4, 2010 , pp. 433-445 More about this Journal
Abstract
The aim of this study was to evaluate the fixation effect by connecting impression copings and to compare the three types of impression trays which were used in open tray impression technique. Experimental groups used 3 types of impression trays which are custom tray, plastic metal combination tray and polycarbonate stock tray. These three groups were subdivided into splinted and non-splinted impression copings group. The total number of experimental groups was six. 10 specimens were made for each group. We used 1-screw test, observing the specimen on which only one side abutment of reference framework was fixated with 20 Ncm. The gap between implant analogue and abutment of the other side was observed by stereo microscope. It was measured at 6 points in each specimen. Measuring value was selected when same result was revealed 3 times. Recorded data were statistically analyzed. Whether impression copings were splinted or not, there was no significant difference among custom tray group, plastic metal combination tray group, and polycarbonate stock tray group. Significant statistical difference in vertical fit discrepancy was found between splinted and non-splinted impression copings group with custom tray, plastic metal combination tray and polycarbonate stock tray (p<0.05).
Keywords
accuracy; impression copings; impression trays; splinting;
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