J Adv Prosthodont.  2020 Feb;12(1):9-14. 10.4047/jap.2020.12.1.9.

The effects of repetitive firing processes on the optical, thermal, and phase formation changes of zirconia

• Ozdogan A
• Ozdemir H

• KMID: 2470792
• DOI: http://doi.org/10.4047/jap.2020.12.1.9

Abstract

PURPOSE
The aim of this study was to investigate the effect of different numbers of heat treatments applied to superstructure porcelain on optical, thermal, and phase formation properties of zirconia.
MATERIALS AND METHODS
Forty zirconia specimens were prepared in the form of rectangular prism. Specimens were divided into four groups (n = 10) according to the number of firing at heating values of porcelain. Color differences and translucency parameter were measured, and X-ray diffraction (XRD) analysis and differential scanning calorimetry (DSC) were performed. Data were analyzed with analysis of variance (ANOVA).
RESULTS
There were no statistically significant differences in ΔE, TP, L, a, and b value changes of the zirconia specimens as a result of repetitive firing processes (P>.05).
CONCLUSION
Although additional firing processes up to 4 increase peak density in thermal analysis, additional firing processes up to 4 times can be applied safely as they do not result in a change in color and phase character of zircon frameworks.

Keyword

Optical properties; Phase formation; Repetitive firing; Zirconia framework

MeSH Terms

Calorimetry, Differential Scanning
Dental Porcelain
Fires*
Heating
Hot Temperature
X-Ray Diffraction
Dental Porcelain

Figure

• 

  Fig. 1 The XRD analysis of the groups of the repeated firing processes.

• 

  Fig. 2 The DSC analysis of the groups of the repeated firing processes.

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