Survival of implant-supported resin-matrix ceramic crowns: In silico and fatigue analyses

Edmara T.P. Bergamo, Satoshi Yamaguchi, Paulo G. Coelho, Adolfo C.O. Lopes, Chunwoo Lee, Gerson Bonfante, Ernesto B. Benalcázar Jalkh, Everardo N.S. de Araujo-Júnior, Estevam A. Bonfante

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To evaluate the fatigue survival, failure mode, and maximum principal stress (MP Stress) and strain (MP Strain) of resin-matrix ceramic systems used for implant-supported crowns. Methods: Identical molar crowns were milled using four resin-matrix ceramics (n = 21/material): (i) Shofu Hard, (ii) Cerasmart (iii) Enamic, and (iv) Shofu HC. Crowns were cemented on the abutments, and the assembly underwent step-stress accelerated-life testing. Use level probability Weibull curves at 300 N were plotted and the reliability at 300, 500 and 800 N was calculated for a mission of 50,000 cycles. Fractographic analysis was performed using stereomicroscope and scanning electron microscope. MP Stress and MP Strain were determined by finite element analysis. Results: While fatigue dictated failures for Cerasmart (β > 1), material strength controlled Shofu Hard, Enamic, and Shofu HC failures (β < 1). Shofu HC presented lower reliability at 300 N (79%) and 500 N (59%) than other systems (>90%), statistically different at 500 N. Enamic (57%) exhibited a significant reduction in the probability of survival at 800 N, significantly lower than Shofu Hard and Cerasmart; however, higher than Shofu HC (12%). Shofu Hard and Cerasmart (>93%) demonstrated no significant difference for any calculated mission (300–800 N). Failure mode predominantly involved resin-matrix ceramic fracture originated from occlusal cracks, corroborating with the MP Stress and Strain location, propagating through the proximal and cervical margins. Significance: All resin-matrix ceramics crowns demonstrated high probability of survival in a physiological molar load, whereas Shofu Hard and Cerasmart outperformed Enamic and Shofu HC at higher loads. Material fracture comprised the main failure mode.

Original languageEnglish (US)
Pages (from-to)523-533
Number of pages11
JournalDental Materials
Volume37
Issue number3
DOIs
StatePublished - Mar 2021

Keywords

  • Ceramics
  • Dental implants
  • Fatigue
  • Reliability
  • Weibull

ASJC Scopus subject areas

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials

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