J Korean Acad Conserv Dent.  2006 Jul;31(4):312-322. 10.5395/JKACD.2006.31.4.312.

Influence of the Surface roughness on translucency and surface color of the dental composite resins

• Cho KJ
• Park SJ
• Cho HG
• Kim DJ
• Hwang YC
• Oh WM
• Hwang IN

• KMID: 1986874
• DOI: http://doi.org/10.5395/JKACD.2006.31.4.312

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.

Keyword

Surface roughness; Surface color; Opacity; Translucency; Composite resin

MeSH Terms

Composite Resins*
Polymers
Composite Resins
Polymers

Figure

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  Figure 1 CIE L*a*b* color system.

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  Figure 2 The overall roughness of the surface (Ra parameter) is defined as the arithmetical average value of all absolute distances of the roughness profile from the centerline within the measuring length.

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  Figure 3 L* value of the measured specimens.

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  Figure 4 a* value of the measured specimens.

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  Figure 5 b* value of the measured specimens.

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  Figure 6 Surface roughness (Ra) of composite resins according to surface treatment.

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  Figure 7 Comparison of contrast ratio resulting from various roughness of sandpaper.

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  Figure 8 Comparison of Ra resulting from various roughness of sandpaper.

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  Figure 9 Correlation between contrast ratio and mean surface roughness (Ra).

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  Figure 10 Profile tracing of Charisma A3 according to surface treatment by sandpaper.

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