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Volume 9 , Issue 5
September/October 1994

Pages 533540

The Accuracy of Three Implant Impression Techniques: A Three-dimensional Analysis

Keith M. Phillips, DMD, MSD/Jack I. Nicholls, PhD/Tsun Ma, DMD, MS/Jeffrey Rubenstein, DMD, MS

The purpose of this study was to compare the accuracy of three different implant impression techniques using (a) tapered copings, (b) square copings alone, and (c) square copings with an acrylic-resin splint. Total distortion was analyzed using a coordinate measuring machine with an accuracy of less than l μm, In this procedure, the three-dimensional coordinates of all five copings on the master model provided the initial or control location. Subsequently, the three-dimensional coordinates of these same copings in the impression material provided the final or test location. Comparing these two data sets allowed calculation of the distortion or relative movement of the copings during the impression-making procedure. The distortion for each of the three coping types was compared using a one-way ANOVA. In addition, the distortion values for the three coping types were compared to the known machining tolerances for these copings. The statistical evaluations indicated (1) the square coping distortions were significantly smaller than the tapered coping values and (2) only the square coping distortions (no acrylic-resin splint) were not significantly different from the machining tolerances.

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