The Journal of Advanced Prosthodontics

  • 제9권3호
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  • Pages.152-158
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  • 2017
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  • 2005-7806(pISSN)
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  • 2005-7814(eISSN)
대한치과보철학회 (The Korean Academy of Prosthodonitics)
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The effect of different cooling rates and coping thicknesses on the failure load of zirconia-ceramic crowns after fatigue loading

  • Tang, Yu Lung (Nonsan Yonsei Suite Dental Clinic) ;
  • Kim, Jee-Hwan (Department of Prosthodontics, Yonsei University Dental Hospital, College of Dentistry, Yonsei University) ;
  • Shim, June-Sung (Department of Prosthodontics, Yonsei University Dental Hospital, College of Dentistry, Yonsei University) ;
  • Kim, Sunjai (Department of Prosthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University)
  • 투고 : 2016.07.14
  • 심사 : 2016.11.17
  • 발행 : 2017.06.30
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초록

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.

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참고문헌

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