Publication: The effect of thickness on the contrast ratio and color of veneering ceramics.
Accepted Date
2014-03-06
Issued Date
2014-05
Resource Type
Language
eng
ISSN
0125-5614 (printed)
Rights
Mahidol University
Rights Holder(s)
Faculty of Dentistry Mahidol University
Bibliographic Citation
Sithiamnuai P, Eiampongpaiboon T, Shrestha A, Suputtamongkol K. The effect of thickness on the contrast ratio and color of veneering ceramics. M Dent J. 2014; 34(2): 137-43.
Suggested Citation
Phira Sithiamnuai, พีระ สิทธิอำนวย, Trinuch Eiampongpaiboon, ตรีนุช เอี่ยมพงษ์ไพบูลย์, Shrestha, Arati, Kallaya Suputtamongkol, กัลยา ศุพุทธมงคล The effect of thickness on the contrast ratio and color of veneering ceramics.. Sithiamnuai P, Eiampongpaiboon T, Shrestha A, Suputtamongkol K. The effect of thickness on the contrast ratio and color of veneering ceramics. M Dent J. 2014; 34(2): 137-43.. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/1152
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Title
The effect of thickness on the contrast ratio and color of veneering ceramics.
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Abstract
Objectives: The objectives of this study were to evaluate the effect of
thickness on the contrast ratio and color of two veneering ceramics.
Materials and methods: Square shaped specimens (15mm x15 mm) were
prepared from A3 shade of Vita VM9 (V) and IPS e-max Ceram (E) at four
different thicknesses i.e., 0.6mm,0.8mm,1.2mm,1.5mm (n=5). All specimens
were finished flat on a milling machine to the required dimension using 100 µ
m diamond coated disc. The contrast ratio (CR= Yb
/ Yw
) and color difference
(∆ E= [(L*1
-L2
*)2
+ (a*1
- a*2
)
2
+ (b*1
-b*2
)]2
)
1/2 were measured with a
spectrophotometer and calculated. The statistical analyses for the mean
contrast ratio (CR) of all groups were performed by two-way ANOVA and
Tukey multiple comparison test at α=0.05. Color differences (∆E*) were
compared between different thicknesses for the same brand and between
different brands at the same thicknesses.
Results: The results showed that the mean CR increased significantly with the
increase in thickness from 0.6 to 1.5mm for both veneering ceramics; the CR
of V 0.6 (0.61±0.01) was the lowest whereas CR of V 1.5 (0.87±0.00) and E 1.5
(0.87±0.01) were the highest. The brands did not significantly influence the
mean contrast ratio in each thickness of veneering ceramics. For both
veneering ceramics, a decrease in L*and an increase in a*were observed when
the thickness increased. No influence of increasing thickness on b*was
observed.
Conclusions: The contrast ratio of two veneering ceramics was significantly
influenced by thickness irrespective of the brands. L* and a* were influenced
by thickness but not b*. When the thickness of the veneering ceramic was
increased in both the brands, color changes were observed as an increase in
∆E* value.