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Accuracy of Stone Cast Produced by Adjustable Dental Impression Tray  

Park, Kwang-Su (Department of Prosthodontics, College of Dentistry, Wonkwang University)
Dong, Jin-Keun (Department of Prosthodontics, College of Dentistry, Wonkwang University)
Sim, Hun-Bo (Department of Prosthodontics, College of Dentistry, Wonkwang University)
Oh, Sang-Chun (Department of Prosthodontics, College of Dentistry, Wonkwang University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.22, no.4, 2006 , pp. 317-328 More about this Journal
Abstract
Purpose: This study was performed to measure the accuracy of adjustable dental impression trays by a scanning laser three-dimensional digitizer. Materials and Methods: Metal stock tray and adjustable stock trays were used for 40 stone casts(10 casts each) duplicated a resin master model of mandible and maxilla. The type IV dental stone was poured in a allginate impressions and allowed to set for one hour. The casts were digitized using an optical digitizer. The distance between the reference points were measured and analyzed on the graphic image of 3-D graphic software (CATIA version 5.0). The statistical significance of the differences between the groups was determined by a two-way ANOVA. Results: There were no significant differences between the accuracies of the adjustable stock tray and the master model except anterior arch width of the upper arch and the diagonal arch length and arch length(one side) of the lower arch. Conclusion: The adjustable stock trays showed clinically acceptable accuracies of the study casts produced by them.
Keywords
accuracy; adjustable stock tray; metal stock tray;
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