Influence of background color on chromatic value of four all-ceramic system core materials
10.3760/cma.j.issn.1002-0098.2010.06.012
- VernacularTitle:不同桩核材料对四种牙科底层瓷颜色的影响
- Author:
Yong-Gang MA
1
;
Nian ZHANG
;
Xu-Liang DENG
Author Information
1. 清华大学玉泉医院
- Keywords:
Ceramics;
Zirconia;
Background color
- From:
Chinese Journal of Stomatology
2010;45(6):367-369
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the influence of post-core background color on chromatic value of four all-ceramic system core materials at clinically appropriate thicknesses. Methods Disc specimens of 15 mm in diameter and 0. 80 mm in thickness( Empress Ⅱ : Croup A) , and 0. 50 mm in thickness (In-Ceram Zirconia core; Group B; Cercon base color zirconia core: Group C; Cercon base zirconia core; Group D) were fabricated, five in each group. Au-Pt alloy, Ni-Cr alloy and visible light cured dental composite resin (A2 color) background were prepared. Samples were put on different background and their chromatic values were measured with colorimeter ( CIE-1976-L* a* b* ) . Color differences of each specimen on different background material were calculated.Results The color differences among specimens of Group A on different background material were more than 1. 5 (2. 83 ± 0. 70) which meant it could be noticeable to eyes. Those of zirconia were less than 1.5[Group B: (0. 14 ±0. 08); Group C: (0. 90 ±0. 20) ; Group D: (0. 99 ±0. 09) ]. Conclusions The influence of background color on Group A was noticeable to human eyes, and as a result, tooth-colored post should be used for this all-ceramic system. For the other three kinds of zirconia core material system, the color differences among specimens on different background material were unnoticeable. Therefore the three all-ceramic systems have excellent color masking ability and can be used on all color background.
