The influence of five impression techniques on the dimensional accuracy of master models.
A high-grade steel model with different preparation angles of 3 degrees, 7 degrees and 11 degrees in one- and two-step impression techniques were made for the determination of the influence of the preparation angle on the dimension loyalty of the resulting master casts. Using a 3-D-measuring instrument, analysis of the data showed that with the correction technique the model abutments led to a reduction in dependency on the preparation angle. The general reduction in stump height of the abutments was independent of the preparation angle. The double-mix technique showed decent increased abutments and is thus recommended for impressions of supragingival preparations.
Fenske
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Department of Prosthodontics, University of Hamburg, Hamburg, Germany. fenske@uke.uni-hamburg.de
D000704:Analysis of Variance; D002133:Calcium Sulfate; D000044:Dental Abutments; D003760:Dental Impression Materials / Q000737:chemistry; D003761:Dental Impression Technique; D006801:Humans; D021621:Imaging, Three-Dimensional; D008422:Materials Testing; D003765:Models, Dental; D011145:Polyvinyls / Q000737:chemistry; D011312:Pressure; D012117:Resins, Synthetic / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D013193:Stainless Steel; D013499:Surface Properties; D013997:Time Factors
D003760:Dental Impression Materials; C022821:Impregum; D011145:Polyvinyls; D012117:Resins, Synthetic; D012833:Siloxanes; C034183:vinyl polysiloxane; D013193:Stainless Steel; D002133:Calcium Sulfate