posterpresentation
Description

Title: 2949 - Effect of Thermocycle Aging on Color Stability of Monolithic Zirconia

Authors:

Merve Köseoglu, Ataturk University Faculty of Dentistry
Berkman Albayrak (Presenter)
Ataturk University Faculty of Dentistry

Pιnar Gül, Ataturk University Faculty of Dentistry
Funda Bayindir, Ataturk University

Abstract:

Objectives: To evaluate the effect of thermocycle aging on the color stability of monolithic zirconia.

Methods: A total of 80 disc-shaped specimens (1 cm diameter) were produced from monolithic zirconia material, Katana High Translucent. The specimens were prepared in four different thicknesses: 0.5 mm (G1), 1 mm (G2), 1.5 mm (G3) and 2 mm (G4). All the specimens were subjected thermocycle stressing (5°C and 55°C, 60 s dwell time) for 5000 cycles. The initial and final CIE L*a*b* coordinates were measured with a spectrophotometer and color differences (ΔE) were calculated. Data obtained from the study were evaluated by descriptive statistics, correlation analysis, Kolmogorov-Smirnov test, one-way ANOVA and Tukey test.

Results: After thermocycle aging, L*a*b* values decreased for all groups. G4 showed the highest color stability (ΔE=0,85±0,01) and the maximum color difference was observed in G1 (ΔE=0,91±0,02). There was no statistically significant difference in color (ΔE) and L*a*b* values (p〉0,05). Significant color difference was only observed in the thinnest specimens, G1 (p〈0,05).

Conclusions: After thermocyle aging, discrete color differences were observed only in G1. Other groups showed no significant L*a*b* differences. With in the limitations of this in vitro study, the color stability of monolithic zirconia increases in the thickness over 0.5 mm.

Student Presenter

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE

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