Abstract
Statement of problem
Mastication forces in different regions affect the survival of multiunit posterior
restorations. The fracture strength of 3-unit posterior monolithic zirconia fixed
partial dentures (FPDs) and their fracture patterns require investigation.
Purpose
The purpose of this in vitro study was to evaluate and compare the fracture strength
and fracture pattern of 3-unit posterior FPDs fabricated from different monolithic
zirconia materials.
Material and methods
Thirty 3-unit FPDs were fabricated from BruxZir, FireZr, and Upcera (n=10 per group).
Energy-dispersive spectroscopy analysis was performed on 2 selected specimens from
each group. All specimens were exposed to a mastication simulator for 1.2×106 cycles and then monotonically loaded to fracture at a crosshead speed of 1 mm/min.
The surfaces of a selected fractured specimen were examined at magnifications of ×25
and ×500 with scanning electron microscopy. Conformity to normal distribution was
evaluated with the Shapiro-Wilk test. One-way analysis of variance was used to compare
the normally distributed initial crack formation load F initial (Fi) and catastrophic failure strength F maximum (Fm) means by group. Weibull statistics were calculated by using the maximum likelihood
estimation method. The chi-square test was used to compare shape and scale parameters
(α=.05).
Results
The mean Fm values were fail1878.9 N for Upcera, 2177.8 N for BruxZir, and 2229.4 N for FireZr.
Upcera and BruxZir showed statistically significant differences for the Fm mean values (P=.039). The differences between the fracture type distributions according to the groups
were statistically similar (P>.05). For Fi, Upcera presented the highest Weibull modulus value (2.199), FireZr had the lowest
(1.594), while for Fm, BruxZir had the highest Weibull modulus value (9.267) and FireZr the lowest (6.572).
Conclusions
Using the zirconia materials BruxZir, FireZr, and Upcera resulted in high Fm values after aging procedures. With all materials, the fractures were most commonly
found in the connector areas in the tested FPDs.
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Article info
Publication history
Published online: April 04, 2023
Identification
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© 2023 by the Editorial Council for The Journal of Prosthetic Dentistry.
