Comparative fracture strength analysis of Lava and Digident CAD/CAM zirconia ceramic crowns.
- Author:
Taek Ka KWON
1
;
Hyun Soon PAK
;
Jae Ho YANG
;
Jung Suk HAN
;
Jai Bong LEE
;
Sung Hun KIM
;
In Sung YEO
Author Information
- Publication Type:Original Article
- Keywords: All-ceramic crown; Fracture strength; Lava CAD/CAM; Digident CAD/CAM; Zirconia
- MeSH: Ceramics; Collodion; Crowns; Dental Porcelain; Tooth; Zirconium
- From:The Journal of Advanced Prosthodontics 2013;5(2):92-97
- CountryRepublic of Korea
- Language:English
- 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.
