Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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COLOR CHANCES IN COMPOSITE RESINS EXPOSED TO XENON LAMP

크세논 램프에 노출된 복합레진의 색조변화

  • Cho, Young-Gon (Department of Conservative Dentistry, College of dentistry, Chosun University) ;
  • Seo, Jeong-Il (Department of Conservative Dentistry, College of dentistry, Chosun University) ;
  • Kim, Soo-Mee (Department of Conservative Dentistry, College of dentistry, Chosun University) ;
  • Jeong, Jin-Ho (Department of Conservative Dentistry, College of dentistry, Chosun University) ;
  • Lee, Young-Gon (Department of Conservative Dentistry, College of dentistry, Chosun University)
  • 조영곤 (조선대학교 치과대학 보존학교실) ;
  • 서정일 (조선대학교 치과대학 보존학교실) ;
  • 김수미 (조선대학교 치과대학 보존학교실) ;
  • 정진호 (조선대학교 치과대학 보존학교실) ;
  • 이영곤 (조선대학교 치과대학 보존학교실)
  • Published : 2003.05.01
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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 Al, 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 $37^{\circ}C$ for 1 day and 7 days. Group II : exposure of xenon lamp to the specimens in the air at $37^{\circ}C$ for 1 day and 7 days. Group III: exposure of xenon lamp to the specimens in distilled water at $37^{\circ}C$ 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 (${\Delta}E^{*}$) were computed. The results obtained were as follows : 1. In all groups except A1 shade of group III, the ${\Delta}E^{*}$ values presented below 2.0, and group III showed the highest ${\Delta}E^{*}$ 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.

Keywords

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