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Updated: Sep 19, 2025
Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Load-Bearing Capacity of All-Ceramic Fixed Partial Dentures-Do In Vitro Tests Overestimate Strength?
Purpose:
To assess the impact of the testing model on the load-bearing capacity of monolithic zirconia three-unit fixed dental prostheses (FDPs) and to discuss its implications for transferring in vitro results to clinical reality.
Materials And Methods:
In total, 32 CAD-designed three-unit FDPs milled from zirconia were resin-bonded to four different types of die models (n = 8 each): PM (models made from PMMA); FR (fiberglass-reinforced polymer models), NP (CoCr-alloy models), and TM (tooth mobility simulation models). Load-to-failure testing was performed, and data were analyzed (P < .05).
Results:
The mean fracture values were 1,676 ± 210 MPa in group TM, 1,820 ± 203 MPa in group PM, 2,266 ± 138 MPa in group FR, and 4,847 ± 496 MPa in group NP. All direct pairwise comparisons, except for TM and PM, showed significant differences.
Conclusions:
The results suggest that the nature of the underlying model has significant impact on the fracture values of all-ceramic FDPs in in vitro testing. Therefore, the validity of in vitro tests regarding clinical relevance must be questioned, emphasizing the necessity of a close-to-reality and highly standardized testing method.
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