In vitro evaluation of low-temperature aging effects and finishing procedures on the flexural strength and structural stability of Y-TZP dental ceramics
Section snippets
Material and methods
Bars (L: 25 ± 0.2 × W: 4 ± 0.1 × H: 2 ± 0.1 mm) of presintered zirconium oxide stabilized with yttrium oxide (Vita In-Ceram YZ; Vita Zahnfabrik) were cut from zirconia ceramic blocks for the Cerec system (Vita In-Ceram YZ-40; Vita Zahnfabrik), then sintered to full density according to the manufacturer's instructions. The chemical composition and mechanical properties of the In-Ceram blocks are listed in Table I, Table II. Groups tested and experimental procedures are shown in Table III.
The
Strength degradation
Three-point bending flexural strength values are presented in Table IV. Weibull statistical analysis (maximum likelihood method) of the flexural strength data provided 2 parameter estimates for each group: the Weibull modulus m and the normalizing parameter σ0 strength, which corresponds to the 63.2 probability of failure, shown in Table IV. Based on the strength data (Table IV), the airborne-particle–abraded group (group A) was the strongest group (950.2 ± 126.7), which differed from all the
Discussion
The purpose of this in vitro study was to determine the influence of LTD and surface finishing procedures, such as airborne-particle abrasion and polishing, on the flexural strength and the microstructural stability of In-Ceram Y-TZP ceramic material. There were 310 specimens in all, with 61 specimens in the control group and 60 or more specimens in each experimental group.
Data indicated that the material tested performed with homogeneous behavior, because there was no significant difference in
Conclusions
Within the limitations of this in vitro study of the effects of aging and surface treatments on the properties of Y-TZP dental ceramics, the following conclusions were drawn.
- 1.
LTD, polishing, and airborne-particle abrasion did not produce strength degradation effects on the Y-TZP ceramic material examined. However, the airborne-particle-abrasion process is responsible for strength degradation if not neutralized by a region of compressive stresses.
- 2.
Airborne-particle abrasion significantly increased
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