J Korean Acad Prosthodont.  2012 Oct;50(4):235-242. 10.4047/jkap.2012.50.4.235.

A comparative study on the fracture behavior of zironia, glass infiltrated alumina and PFM full crown system

• Lee SH
• Ahn JS
• Kim MH
• Lim BS

• KMID: 2195464
• DOI: http://doi.org/10.4047/jkap.2012.50.4.235

Abstract

PURPOSE
The purpose of this study was to compare the fracture behavior of Zironia, glass infiltrated Alumina and PFM full crown system.
MATERIALS AND METHODS
Fifteen crowns for each of 3 experimental groups (Zironia, glass infiltrated Alumina and PFM full crown) were made by the conventional method. The crowns mounted on the testing jig were inclined in 30 degrees to the long axis of the tooth and the universal testing machine was used to measure the fracture strength.
RESULTS
1. The mean fracture strengths were 588.3 +/- 49.6 MPa for zirconia system, 569.1 +/- 61.8 MPa for PFM system and 551.0 +/- 76.5 MPa for glass-infiltrated alumina system (P>.05). 2. The mean shear bond strengths were 25.5 +/- 5.6 MPa for zirconia system, 38.9 +/- 5.0 MPa for Ni-Cr alloy system and 39.4 +/- 5.1 MPa for glass-infiltrated alumina system. 3. The chemical bonding was observed at interfaces between PFM or glass-infiltrated alumina and veneering porcelain, however, no chemical bonding was observed at interface between zirconia and veneering porcelain.
CONCLUSION
With the study, the fracture strengths of PFM crown system had a higher fracture strength than conventional zirconia system crown and glass-infiltrated alumina crowns. and than the shear bond strengths glass-infiltrated alumina system had a higher shear bond strength than conventional PFM system and zirconia system.

Keyword

Zirconia ceramic crown; Fracture strength; Ez-Cera; Glass-infiltrated alumina

MeSH Terms

Alloys
Aluminum Oxide
Axis, Cervical Vertebra
Collodion
Crowns
Dental Porcelain
Glass
Tooth
Zirconium
Alloys
Aluminum Oxide
Collodion
Dental Porcelain
Zirconium

Figure

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  Fig. 1 Metal die used for the fracture strength test.

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  Fig. 2 Specimens for shear bond strength test.

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  Fig. 3 Schematic diagram of fracture strength test.

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  Fig. 4 Schematic diagram of shear bond strength test.

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  Fig. 5 Cross-sectional SEM image of the interface between porcelain and PFM system (A), zirconia system (B), glass infiltrated alumina system (C). (note : M = metal, P = Porcelain, Z = Zirconia and A = Alumina).

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  Fig. 6 Cross-sectional SEM image of the interface between porcelain (A) metal, (B) zirconia (C) alumina and back scattered electron image (D), (E), (F). (×50,000).

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  Fig. 7 Cross-sectional SEM image of the interface between porcelain and PFM system (A), zirconia system (B), glass infiltrated alumina system (C) and their EDX mapping image (D, E, F).

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  Fig. 8 Fracture strength of experimental groups.

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  Fig. 9 Fracture pattern of zirconia system (A), glass infiltrated alumina system (B) and PFM system (C).

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  Fig. 10 Shear Bond Strength of experimental groups.

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