J Adv Prosthodont.  2017 Jun;9(3):152-158. 10.4047/jap.2017.9.3.152.

The effect of different cooling rates and coping thicknesses on the failure load of zirconia-ceramic crowns after fatigue loading

Affiliations
  • 1Nonsan Yonsei Suite Dental Clinic, Nonsan, Chungnam, Republic of Korea.
  • 2Department of Prosthodontics, Yonsei University Dental Hospital, College of Dentistry, Yonsei University, Seoul, Republic of Korea.
  • 3Department of Prosthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Republic of Korea. sunjai@yuhs.ac

Abstract

PURPOSE
The purpose of this study was to evaluate the influence of different coping thicknesses and veneer ceramic cooling rates on the failure load of zirconia-ceramic crowns.
MATERIALS AND METHODS
Zirconia copings of two different thicknesses (0.5 mm or 1.5 mm; n=20 each) were fabricated from scanning 40 identical abutment models using a dental computer-aided design and computer-aided manufacturing system. Zirconia-ceramic crowns were completed by veneering feldspathic ceramics under different cooling rates (conventional or slow, n=20 each), resulting in 4 different groups (CONV05, SLOW05, CONV15, SLOW15; n=10 per group). Each crown was cemented on the abutment. 300,000 cycles of a 50-N load and thermocycling were applied on the crown, and then, a monotonic load was applied on each crown until failure. The mean failure loads were evaluated with two-way analysis of variance (P=.05).
RESULTS
No cohesive or adhesive failure was observed after fatigue loading with thermocycling. Among the 4 groups, SLOW15 group (slow cooling and 1.5 mm chipping thickness) resulted in a significantly greater mean failure load than the other groups (P<.001). Coping fractures were only observed in SLOW15 group.
CONCLUSION
The failure load of zirconia-ceramic crowns was significantly influenced by cooling rate as well as coping thickness. Under conventional cooling conditions, the mean failure load was not influenced by the coping thickness; however, under slow cooling conditions, the mean failure load was significantly influenced by the coping thickness.

Keyword

Zirconia; Cooling rate; Coping thickness; Failure

MeSH Terms

Adhesives
Ceramics
Computer-Aided Design
Crowns*
Fatigue*
Adhesives

Figure

  • Fig. 1 A schematic image of an abutment model.

  • Fig. 2 A zirconia-ceramic crown with 1.5 mm coping thickness (A) and 0.5 mm coping thickness (B). Yellow color represents zirconia coping and blue color represents veneering ceramic.

  • Fig. 3 A monotonic load was applied 2 mm off center (2 mm from line-angle) of occlusal surface of each zirconia-ceramic crown.

  • Fig. 4 The fracture pattern of zirconia-ceramic crowns from each group. (A) 0.5-mm coping under the conventional cooling rate. (B) 0.5-mm coping under slow cooling. (C) 1.5-mm coping under conventional cooling, (D) 1.5-mm coping under slow cooling.


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