Color changes in composite resins exposed to xenon lamp.
10.5395/JKACD.2003.28.3.195
- Author:
Young Gon CHO
1
;
Jeong Il SEO
;
Soo Mee KIM
;
Jin Ho JEONG
;
Young Gon LEE
Author Information
1. Department of Conservative Dentistry, College of dentistry, Chosun University, Korea. ygcho@mail.chosun.ac.kr
- Publication Type:Original Article
- Keywords:
Xenon lamp;
Color change;
Composite resin;
Color characteristics;
Color difference;
Spectrophotometer
- MeSH:
Aluminum;
Composite Resins*;
Darkness;
Fungi;
Water;
Xenon*
- From:Journal of Korean Academy of Conservative Dentistry
2003;28(3):195-202
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
The purpose of this study was to evaluate the color changes of the composite resin resulting from xenon lamp exposure in different environments. Composite resin (Z 250 ; shade A1, A2, A3, A3.5, and A4) were applied in a cylindrical metal mold. Seventy five specimens according to environments of exposure were made as follows; Group I: aluminum foiling of the specimens in the air at 37degrees C for 1 day and 7 days. Group II: exposure of xenon lamp to the specimens in the air at 37degrees C for 1 day and 7 days. Group III: exposure of xenon lamp to the specimens in distilled water at 37degrees C for 1 day and 7 days. The color characteristics (L*,a*,b*) of the specimens before and after exposure of xenon lamp were measured by spectrophotometer and the total color differences (DeltaE*) were computed. The results obtained were as follows: 1. In all groups except A1 shade of group III, the DeltaE* values presented below 2.0, and group III showed the highest DeltaE* values followed by group II and group I in a decreasing order(p<0.05). 2. In all shades and groups, the more the exposure time of xenon lamp and the lighter the shade were, the higher the tendency for discoloration (p<0.05). 3. The composite resins which was exposed to xenon lamp in the distilled water was more discolored than those in the air (p<0.05). 4. The major changes of composite resins which were exposed to xenon lamp in the air were an increase in yellowness through a positive shift of the b* value, and those in the distilled water were an increase in darkness and yellowness through a negative shift of the L* value and a positive shift of the b* value.
