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http://dx.doi.org/10.5395/JKACD.2006.31.4.312

INFLUENCE OF THE SURFACE ROUGHNESS ON TRANSLUCENCY AND SURFACE COLOR OF THE DENTAL COMPOSITE RESINS  

Cho Kyu-Jeong (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University)
Park Su-Jung (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University)
Cho Hyun-Gu (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University)
Kim Dong-Jun (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University)
Hwang Yun-Chan (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University)
Oh Won-Mann (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University)
Hwang In-Nam (Dept. of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University)
Publication Information
Restorative Dentistry and Endodontics / v.31, no.4, 2006 , pp. 312-322 More about this Journal
Abstract
The objectives of this study were to evaluate the effect of surface roughness on the surface color and translucency of the composite resins. Two composite resins (Esthet-X, Dentsply, Milford, USA and Charisma, Kulzer, Domagen, Germany) were used to investigate the surface color. Charisma was used to investigate the translucency. 40 disc samples (diameter: 8 mm, thickness: 5 mm) were made by each product to measure the surface color. Polymerized each sample's one side was treated by Sof-Lex finishing and polishing system (Group C, M, F, SF). 40 disc samples (diameter: 6 mm, thickness: 1 mm) were prepared to measure the opacity. 1 mm samples were ground one side with #600, #1000, #1500 and #2000 sandpapers. CIE $L^{*}a^{*}b^{*}$ values of each 5 mm thickness samples, and XYZ values of 1 mm thickness samples on the white and black background were measured with spectrophotometer (Spectrolino, GretagMacbeth, Regensdorf, Switzerland). Mean surface roughness (Ra) of all samples before and after surface treatment was measured using the Surface Roughness Tester SJ-301 (Mytutoyo, Tokyo, Japan). Regardless of type and shade of the composite resin, $L^{*}$ values measured in group C were higher than others (p < 0.05), and $L^{*}$ value decreased as the Ra value decreased except B3 shade of Esthet-X. But there were no significant difference in $a^{*}$ values among groups. In control group and SF, highest $b^{*}$ values were measured (p < 0.05), except B1 shade of Esthet-X. Contrast ratio decreased as the Ra value decreased (p < 0.05). With the above results, difference of surface roughness has influence on surface color and translucency of dental composite resins.
Keywords
Surface roughness; Surface color; Opacity; Translucency; Composite resin;
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