Restorative Dentistry and Endodontics

  • 제27권1호
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  • Pages.87-94
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  • 2002
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  • 2234-7658(pISSN)
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  • 2234-7666(eISSN)
대한치과보존학회 (The Korean Academy of Conservative Dentistry)
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광중합원에 따른 복합레진의 색채변화

COLOR CHANCES IN COMPOSITES ACCORDING TO VARIOUS LIGHT CURING SOURCES

  • 조영곤 (조선대학교 치과대학 보존학교실) ;
  • 김명조 (조선대학교 치과대학 보존학교실)
  • Cho, Young-Gon (Department of Conservative Dentistry, College of dentistry, Chosun University) ;
  • Kim, Myung-Cho (Department of Conservative Dentistry, College of dentistry, Chosun University)
  • 발행 : 2002.01.01
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초록

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. Group 1 : the specimens were polymerized with Apollo 95E for 3seconds(1370 mW/$\textrm{cm}^2$). Group 2 : the specimens were polymerized with XL 3000 for 40seconds (480 mW/$\textrm{cm}^2$). Group 3 : the specimens were polymerized with Spectrum 800 for 10 seconds(250 mW/$\textrm{cm}^2$) and 30 seconds(700 mW/$\textrm{cm}^2$). 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 6$0^{\circ}C$ 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 ($\Delta$E$^*$) 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 $\Delta$E$^*$ values presented below 2.0. 3 Group I showed the highest $\Delta$E$^*$ values followed order from highest to lowest by Group II and III (p<0.05).

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피인용 문헌

  1. Color changes in composite resins exposed to xenon lamp vol.28, pp.3, 2003, https://doi.org/10.5395/JKACD.2003.28.3.195
  2. Effect of the difference in spectral outputs of the single and dual-peak LEDs on the microhardness and the color stability of resin composites vol.36, pp.2, 2011, https://doi.org/10.5395/JKACD.2011.36.2.108
  3. Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength vol.36, pp.4, 2011, https://doi.org/10.5395/JKACD.2011.36.4.324