Effect of Surface Finishing Methods and Aging on Surface Roughness and Optical Properties of Zirconia-Reinforced Lithium Silicate Glass-Ceramic

Yıl 2019, Cilt: 22 Sayı: 1, 121 - 130, 13.03.2019

Gülce Alp Meryem Gülce Subaşı

https://doi.org/10.7126/cumudj.502650

Cited By: 2

Öz

ABSTRACT

Objectives: The effects
of three different surface finishing methods and aging on the surface roughness and optical properties of zirconia-reinforced
lithium silicate (ZLS) glass-ceramic were investigated.

Materials and
Methods: Rectangular specimens (0.6 mm thickness) were sliced
from ZLS blocks (N=36). Three different types of surface finishing [glazing combined
with crystallization (ZLS-CF) or after crystallization (ZLS-G) and polishing
(ZLS-P)] (n=12) and 5000 thermocycles were applied. Three sets of measurements were
performed before and after aging to determine the color coordinates and surface roughness (Ra) by using a colorimeter and
profilometer, respectively. The mean surface roughness (Ra) values were
calculated. Color differences and translucency parameter (TP) values were
calculated using the color difference ΔE_ab and TP formulas. ANOVA
was used to analyze the color difference, translucency, and surface roughness values
(α=.05).

Results: Significant
differences in the ΔE values were not observed (P=.736) for specimens with different types of surface finishing. A
significant difference was observed between the translucency values for different
surface finishing groups before aging (P<.001).
A significant difference in the surface roughness data between samples with different
kinds of surface finishing was observed both before and after aging (P<.001). The ZLS-P group exhibited lowest
surface roughness values before and after aging (P<.001). A positive significant correlation between the ΔE and
translucency change values was observed in both the ZLS-G (P=.005) and ZLS-P (P<.001)
groups.

Conclusions:
The surface finishing type did not affect the color change of ZLS
glass-ceramic. The translucency values for different surface finished ZLS glass-ceramic
specimens changed before aging. After aging, the surface finishing did not
affect the translucency of ZLS glass-ceramic. All tested groups exhibited surface
roughness values higher than the plaque accumulation threshold (Ra=0.2 mm). 

Anahtar Kelimeler

Ceramics, color, surface properties

Kaynakça

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