Abstract
Statement of problem
Sintering holding times and aging conditions may affect the optical, mechanical, and
structural properties of polychromatic multitranslucent zirconia. However, a consensus
on the ideal sintering condition for this material is lacking.
Purpose
The purpose of this in vitro study was to investigate the effect of different sintering
holding and autoclave aging times on the flexural strength (FS), grain size, and translucency
parameter (TP00) of a translucent zirconia.
Material and methods
Sixty bar-shaped and 60 rectangular-shaped specimens were prepared from computer-aided
design and computer-aided manufacturing (CAD-CAM) zirconia blocks and split into 2
groups to be sintered at 1550 °C for different holding times (regular: 2 hours, prolonged:
5 hours). The specimens were then divided into 3 subgroups and subjected to aging
processes (control, aging for 60 minutes, aging for 120 minutes). FS values were obtained
by using a 3-point bend test and Weibull analysis was conducted. Grain size evaluations
were performed by using scanning electron microscope (SEM) observations. TP00 was measured with a spectrophotometer. Statistical evaluation included the Kolmogorov-Smirnov,
2-way ANOVA, and Tukey HSD tests (α=.05).
Results
The sintering procedure, aging, and their interaction significantly influenced the
TP00 (P<.05). FS values and grain sizes were affected by aging only (P<.001). Both aging times resulted in reduced FS and increased grain sizes. Prolonged
sintering in combination with 120 minutes of aging negatively affect the TP00 scores (P<.05).
Conclusions
FS values were similar under regular and prolonged sintering. Prolonged sintering
led to a decrease in translucency after 120 minutes of aging. Steam autoclave aging
can affect the optical and mechanical properties of translucent zirconia.
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Article info
Publication history
Published online: May 05, 2021
Identification
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© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
