J Adv Prosthodont.  2013 May;5(2):92-97. 10.4047/jap.2013.5.2.92.

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

Affiliations
  • 1Department of Dentistry, St. Catholic Hospital, Catholic University of Korea, Suwon, Republic of Korea.
  • 2Department of Prosthodontics, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea. pros53@snu.ac.kr, jhoyang@snu.ac.kr

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.

Keyword

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

MeSH Terms

Ceramics
Collodion
Crowns
Dental Porcelain
Tooth
Zirconium
Ceramics
Collodion
Dental Porcelain
Zirconium
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