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

Yu Lung Tang, Jee Hwan Kim, June Sung Shim, Sunjai Kim

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

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. Zirconiaceramic 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.

Original languageEnglish
Pages (from-to)152-158
Number of pages7
JournalJournal of Advanced Prosthodontics
Volume9
Issue number3
DOIs
Publication statusPublished - 2017 Jun 1

Bibliographical note

Publisher Copyright:
© 2017 The Korean Academy of Prosthodontics.

All Science Journal Classification (ASJC) codes

  • Oral Surgery
  • Dentistry (miscellaneous)

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