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

Kyu-Jeong Cho; Su-Jung Park; Hyun-Gu Cho; Dong-Jun Kim; Yun-Chan Hwang; Won-Mann Oh; In-Nam Hwang

doi:10.5395/JKACD.2006.31.4.312

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Cho, Park, Cho, Kim, Hwang, Oh, and Hwang: Influence of the Surface roughness on translucency and surface color of the dental composite resins

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2006; 31(4): 312-322.

Published online: 31 July 2006

DOI: https://doi.org/10.5395/JKACD.2006.31.4.312

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

Kyu-Jeong Cho, Su-Jung Park, Hyun-Gu Cho, Dong-Jun Kim, Yun-Chan Hwang, Won-Mann Oh, In-Nam Hwang

Department of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University, Korea.

Corresponding Author: In-Nam Hwang. Department of Conservative Dentistry, School of Dentistry, Chonnam National University, 5 Hak-dong, Dong-gu, Gwangju, Korea, 501-757. Tel. 82-62-220-4443, Fax. 82-62-225-8387, hinso@jnu.ac.kr

Received 17 April 2006 Revised 29 May 2005 Accepted 28 June 2006

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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

Figures and Tables

Figure 1

CIE L^*a^*b^* color system.

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.

Figure 3

L^* value of the measured specimens.

Figure 4

a^* value of the measured specimens.

Figure 5

b^* value of the measured specimens.

Figure 6

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

Figure 7

Comparison of contrast ratio resulting from various roughness of sandpaper.

Figure 8

Comparison of Ra resulting from various roughness of sandpaper.

Figure 9

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

Figure 10

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

Table 1

Composite resins used in this study

Table 2

L^*a^*b^* values of the tested materials Mean (S.D.), n = 10

Values with same superscripts are not significantly different at p < 0.05 level among different surface treatment of same material.

Table 3

EColor difference (ΔE^*) between control group and surface treated groups

Table 4

Effect of surface treatment by Sof-lex disc on surface roughness (Ra, µm)

Values with same superscripts are not significantly different at p < 0.05 level among different surface treatment of same material.

Table 5

Contrast ratio and mean surface roughness (Ra) resulting from various roughness of sandpaper

Values with same superscripts are not significantly different at p < 0.05 level.

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