Color changes in composites according to various light curing sources.
10.5395/JKACD.2002.27.1.087
- Author:
Young Gon CHO
1
;
Myung Cho KIM
Author Information
1. Department of Conservative Dentistry, College of dentistry, Chosun University, Korea.
- Publication Type:Original Article
- Keywords:
Color changes;
Composite;
Light curing sources
- MeSH:
Immersion;
Light;
Polymerization;
Polymers;
Water
- From:Journal of Korean Academy of Conservative Dentistry
2002;27(1):87-94
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
The purpose of this study was to evaluate the color changes of composite resin polymerized with three type of light curing units. Composite resin (Z100, shade A2) were applied in a cylindrical metal mold(2 mm thick, 7 mm diameter). Twenty specimens according to light curing units were made. Group1: the specimens were polymerized with Apollo 95E for 3seconds(1370 mW/cm2). Group2: the specimens were polymerized with XL 3000 for 40seconds(480 mW/cm2). Group3: the specimens were polymerized with Spectrum 800 for 10 seconds(250 mW/cm2) and 30 seconds(700 mW/cm2). The microhardness values(VHN) of upper and lower surfaces specimens after light polymerization were measured for the degree of polymerization. All specimens were stored in distilled water at 60degrees C for 30 days. The color characteristics(L*, a*, b*) of the specimens before and after immersion were measured by spectrophotometer and the total color difference (DeltaE*) was computed. The results obtained were as follows: 1. The microhardness values of Group I showed significantly lower than those of Group II and III(p<0.05). 2. In all groups the DeltaE* values presented below 2.0. 3. Group I showed the highest DeltaE* values followed order from highest to lowest by Group II and III (p<0.05).
