Abstract
Statement of problem
Studies are sparse on how rapid heating and cooling negatively affect optical properties,
including color and transparency, and mechanical properties, including hardness and
durability, that affect esthetics and shorten the clinical usage period of the ceramics.
Purpose
The purpose of this in vitro study was to determine the effects of repeated firing
on the color difference, mechanical properties, and phase formation of different ceramic
materials.
Material and methods
A total of 160 disks (12×1.35 mm) were produced from 4 different ceramic materials:
lithium disilicate glass-ceramic, zirconia-reinforced lithium silicate ceramic, zirconia
core, and monolithic zirconia. Specimens from all groups were divided into 4 groups
(n=10) with a different number of veneer porcelain firings (1 to 4) by simple randomization.
After the firings, color measurement, X-ray diffraction analysis, environmental scanning
electron micrograph analysis, surface roughness evaluation, Vickers hardness evaluation,
and biaxial flexural strength tests were performed. Data were analyzed with analysis
of variance (2-way ANOVA) (α=.05).
Results
Repeated firing did not affect the flexural strength of the specimens in any of the
groups (P>.05), while the color, surface roughness, and surface hardness were significantly
affected (P<.05). The specimens fired 4 times showed the highest mean Vickers hardness and ΔE00 values but the lowest mean surface roughness values. Zirconia core specimens showed
the highest mean ΔE00 and flexural strength values, and lithium disilicate glass-ceramic specimens had
the highest mean Vickers hardness values.
Conclusions
The increase in the number of firings affected the color, mechanical properties, and
phase formation of the specimens; this change differed according to the ceramic tested.
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Article info
Publication history
Published online: March 06, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: Supported by the Department of Scientific Research Projects (TSA-2021-9220) Atatürk University, Erzurum, Turkey.
Identification
Copyright
© 2023 by the Editorial Council for the Journal of Prosthetic Dentistry.
