European Journal of Prosthodontics and Restorative Dentistry

The Reproducibility and Accuracy of Internal Fit of Cerec 3d Cad/cam all Ceramic Crowns

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Cover Date

June 2009

Print ISSN

0965-7452

Vol

17

Issue

2

Abstract

Abstract - The objective of this study was to evaluate the reproducibility and accuracy of internal fit using Cerec 3D CAD/CAM (computer aided design/computer aided manufacturing) all-ceramic crowns and to investigate the proximal contact point areas between the crowns and neighbouring teeth, in terms of location and the presence or absence of contact. A total of 48 crowns were milled and divided into two groups of twenty-four each. One group consisted of testing a Control die and the other group consisted of testing single Replica stone die duplicates of the Control die. The Internal Marginal Gap, Axio-Occlusal Transition Gap and Occlusal Gap were measured on each crown in both groups. No significant differences were identified between the mean thickness of the Marginal Gap, the Axio-Occlusal Transition Gap and the Occlusal Gap of the Control die when compared with the Replica dies indicating uniformity and consistency of the accuracy of fit and therefore die replication.

KEY WORDS: Cerec 3D CAD/CAM, Accuracy of Fit, Proximal Contacts