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J Adv Prosthodont. 2013 May;5(2):92-7. doi: 10.4047/jap.2013.5.2.92. Epub 2013 May 30.

Comparative fracture strength analysis of Lava and Digident CAD/CAM zirconia ceramic crowns.

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1
Department of Dentistry, St. Catholic Hospital, Catholic University of Korea, Suwon, Republic of Korea.

Abstract

PURPOSE:

All-ceramic crowns are subject to fracture during function. To minimize this common clinical complication, zirconium oxide has been used as the framework for all-ceramic crowns. The aim of this study was to compare the fracture strengths of two computer-aided design/computer-aided manufacturing (CAD/CAM) zirconia crown systems: Lava and Digident.

MATERIALS AND METHODS:

Twenty Lava CAD/CAM zirconia crowns and twenty Digident CAD/CAM zirconia crowns were fabricated. A metal die was also duplicated from the original prepared tooth for fracture testing. A universal testing machine was used to determine the fracture strength of the crowns.

RESULTS:

THE MEAN FRACTURE STRENGTHS WERE AS FOLLOWS: 54.9 ± 15.6 N for the Lava CAD/CAM zirconia crowns and 87.0 ± 16.0 N for the Digident CAD/CAM zirconia crowns. The difference between the mean fracture strengths of the Lava and Digident crowns was statistically significant (P<.001). Lava CAD/CAM zirconia crowns showed a complete fracture of both the veneering porcelain and the core whereas the Digident CAD/CAM zirconia crowns showed fracture only of the veneering porcelain.

CONCLUSION:

The fracture strengths of CAD/CAM zirconia crowns differ depending on the compatibility of the core material and the veneering porcelain.

KEYWORDS:

All-ceramic crown; Digident CAD/CAM; Fracture strength; Lava CAD/CAM; Zirconia

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