The International journal of prosthodontics · 2026
Load-Bearing Capacity of All-Ceramic Fixed Partial Dentures-Do In Vitro Tests Overestimate Strength?
СтатьяНазвание и аннотация: Перевод в очереди
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Erdelt Kurt-Jürgen, Schweiger Josef, Bäumer Monika, Edelhoff Daniel, Schubert Oliver
Аннотация
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.
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.