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

Kwon TK, Pak HS, Yang JH, Han JS, Lee JB, Kim SH, Yeo IS - J Adv Prosthodont (2013)

Bottom Line: To minimize this common clinical complication, zirconium oxide has been used as the framework for all-ceramic crowns.A metal die was also duplicated from the original prepared tooth for fracture testing.The fracture strengths of CAD/CAM zirconia crowns differ depending on the compatibility of the core material and the veneering porcelain.

View Article: PubMed Central - PubMed

Affiliation: 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.

No MeSH data available.


Related in: MedlinePlus

Photographs after fracture strength tests. A: Lava CAD/CAM crowns showed crown core fracture pattern, B: Digident CAD/CAM crowns showed interfacial fracture pattern of core and veneering porcelain.
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Figure 5: Photographs after fracture strength tests. A: Lava CAD/CAM crowns showed crown core fracture pattern, B: Digident CAD/CAM crowns showed interfacial fracture pattern of core and veneering porcelain.

Mentions: 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 (Fig. 3). The greater fracture resistance of the Digident CAD/CAM crowns compared to the Lava CAD/CAM crowns was statistically significant (P<.001). It was also possible to observe that the Lava CAD/CAM zirconia crowns always showed a complete fracture of both the veneering porcelain and the core (Fig. 4 and 5A), while in the Digident crowns, only a fracture of the veneering porcelain was observed consistently (Fig. 4 and 5B).


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

Kwon TK, Pak HS, Yang JH, Han JS, Lee JB, Kim SH, Yeo IS - J Adv Prosthodont (2013)

Photographs after fracture strength tests. A: Lava CAD/CAM crowns showed crown core fracture pattern, B: Digident CAD/CAM crowns showed interfacial fracture pattern of core and veneering porcelain.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3675299&req=5

Figure 5: Photographs after fracture strength tests. A: Lava CAD/CAM crowns showed crown core fracture pattern, B: Digident CAD/CAM crowns showed interfacial fracture pattern of core and veneering porcelain.
Mentions: 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 (Fig. 3). The greater fracture resistance of the Digident CAD/CAM crowns compared to the Lava CAD/CAM crowns was statistically significant (P<.001). It was also possible to observe that the Lava CAD/CAM zirconia crowns always showed a complete fracture of both the veneering porcelain and the core (Fig. 4 and 5A), while in the Digident crowns, only a fracture of the veneering porcelain was observed consistently (Fig. 4 and 5B).

Bottom Line: To minimize this common clinical complication, zirconium oxide has been used as the framework for all-ceramic crowns.A metal die was also duplicated from the original prepared tooth for fracture testing.The fracture strengths of CAD/CAM zirconia crowns differ depending on the compatibility of the core material and the veneering porcelain.

View Article: PubMed Central - PubMed

Affiliation: 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.

No MeSH data available.


Related in: MedlinePlus