Fatigue behavior of zirconia-ceramic, galvano-ceramic, and porcelain-fused-to-metal fixed partial dentures.

Abstract

PURPOSE:

This study evaluated the fatigue behavior of three fixed partial dentures (FPDs) before and after artificial fatigue testing.

MATERIALS AND METHODS:

Sixty, three-unit zirconia-ceramic (ZC), galvano-ceramic (GC), and porcelain-fused-to-metal (PFM) FPDs (N = 20) were fabricated. Ten specimens from each group were exposed to fatigue testing by being thermocycled (5 to 55°C, 10,000 cycles) and loaded (100,000 cycles, 50 N, 0.5 Hz). All specimens were then subjected to occlusal loading in a universal testing machine until fracture. The fractures were characterized using scanning electron microscopy. Data were analyzed using one-way ANOVA followed by Tukey's significant difference post hoc test and the paired t-test. The chi-squared test was used to evaluate the type of fracture (α = 0.05).

RESULTS:

The mean fracture loads of non-fatigued and fatigued specimens for ZC were 2434.9 ± 154.3 and 2333.1 ± 183.0 N, respectively; for GC were 1678.1 ± 211.6 and 1475.8 ± 227.9 N, respectively; and 1878.5 ± 176.5 and 1687.8 ± 162.2 N, respectively, for PFM restorations. Significant differences were observed between fatigued and non-fatigued specimens of both the GC group and PFM group (p < 0.05), but not between fatigued and non-fatigued ZC specimens (p > 0.05). Differences between the PFM and GC specimens were not statistically significant for fatigued or non-fatigued specimens (p > 0.05). Fracture types did not differ significantly among groups.

CONCLUSIONS:

ZC specimens were not significantly affected by fatigue, whereas GC and PFM specimens were affected. All tested restorations have the potential to withstand occlusal forces applied in the posterior region.

• Authors: Zekiye Eroğlu, Aysegul G Gurbulak
• Journal: Journal of prosthodontics : official journal of the American College of Prosthodontists (J Prosthodont) Vol. 22 Issue 7 Pg. 516-522 (Oct 2013) ISSN: 1532-849X [Electronic] United States
• PMID: 23735078 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2013 by the American College of Prosthodontists.

Chemical References

• Chromium Alloys
• Dental Materials
• Metal Ceramic Alloys
• Dental Porcelain
• Zirconium
• zirconium oxide

Topics

• Bite Force
• Ceramics (chemistry)
• Chromium Alloys (chemistry)
• Computer-Aided Design
• Dental Abutments
• Dental Materials (chemistry)
• Dental Porcelain (chemistry)
• Dental Restoration Failure
• Dental Stress Analysis (instrumentation)
• Denture Design
• Denture, Partial, Fixed
• Electrochemical Techniques
• Humans
• Materials Testing
• Metal Ceramic Alloys (chemistry)
• Microscopy, Electron, Scanning
• Models, Dental
• Stress, Mechanical
• Surface Properties
• Temperature
• Zirconium (chemistry)