Estimation of the reliability of all-ceramic crowns using finite element models and the stress-strength interference theory.
The reliability of all-ceramic crowns is of concern to both patients and doctors. This study introduces a new methodology for quantifying the reliability of all-ceramic crowns based on the stress-strength interference theory and finite element models. The variables selected for the reliability analysis include the magnitude of the occlusal contact area, the occlusal load and the residual thermal stress. The calculated reliabilities of crowns under different loading conditions showed that too small occlusal contact areas or too great a difference of the thermal coefficient between veneer and core layer led to high failure possibilities. There results were consistent with many previous reports. Therefore, the methodology is shown to be a valuable method for analyzing the reliabilities of the restorations in the complicated oral environment.
Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, 145 West Changle Road, Xi'an, PR China.
Yan
Y
Li
Jianjun
J
Chen
Jipeng
J
Liu
Lei
L
Zhang
Weiguo
W
Wang
Shaofeng
S
Zhang
D002516:Ceramics; D003442:Crowns; D020342:Finite Element Analysis; D006801:Humans; D008962:Models, Theoretical; D013314:Stress, Mechanical
All-ceramic crowns; Finite element analysis; Occlusal contact areas; Occlusal loads; Reliability failure possibility; Residual thermal stress; Stress–strength interference