Opacity and masking effect of the opaque shade composite resins

Article information

Restor Dent Endod. 2007;32(4):356-364

Publication date (electronic) : 2007 July 31

doi : https://doi.org/10.5395/JKACD.2007.32.4.356

Su Jung Park , Yun-Chan Hwang , Wonmann Oh , In-Nam Hwang

Department of Conservative Dentistry, School of Dentistry, DSRI, 2nd stage of BK21, Chonnam National University, Korea.

Corresponding Author: In-Nam Hwang. Department of Conservative Dentistry, School of Dentistry, Chonnam National University, 8 Hak-dong, Dong-gu, Gwangju, 501-757, Korea. Tel: 82-62-220-4443, Fax: 82-62-225-8387, hinso@jnu.ac.kr

Received 2007 April 10; Revised 2007 May 05; Accepted 2007 May 19.

Abstract

The purpose of this study was to assess the background color-interceptive ability and opacity of opaque shade composites (Universal composite, Filtek Z350, Charisma, Clearfil ST, Palpaque Estelite, Esthet-X, and Metafil Flo).

Twenty four background specimens (diameter 5.5 mm, thickness 3.0 mm) with Root dentin Mustard (Bisco, Schaumburg, IL, USA) were made. The CIE L^*a^*b^* value of background specimens was measured by a spectrophotometer (Spectrolino, GretagMacbeth, Regensdorf, Switzerland). Three specimens in every group were filled on the background specimens. The surface color of samples was measured by a spectrophotometer in 3.0 mm and every thickness to 0.5 mm while grinding. The color difference in the background color along with 3.0 mm specimen gauged the masking effect in each thickness while grinding and polishing. The opacity was calculated in 1 mm thick specimens.

The opacity was in the decreasing order of Clearfil ST, Metafil Flo, Filtek Z350, Palpaque Estelite, Universal composite, Charisma, and Esthet-X (p < 0.05). As the thickness get reduced, L^* value showed decreasing, a^* increasing tendency. The surface color difference between pair of the 3.0 mm thick specimen and after grinding in same opaque resin was above 3.3 except Clearfil ST and Metafil Flo. The color difference (ΔE^*) between pair of background specimen and opaque resin builtup specimen showed more than 10.0 regardless kinds and thickness.

The variance in opacity characteristics and color of the opaque composites is dependent upon manufacturer. When using the opaque resin, the optical properties of each material must be considered as well as cavity.

Keywords: Opaque shade composite; Surface color; Color difference; Opacity; Masking effect

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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.

Figure 1

Shifts of L^* values on the Mustard background according to the thickness.

Abbreviation. UC: Universal composite, Z350: Filtek Z350, CHA: Charisma, ST: Clearfil ST, PAL: Palpaque Estelite, EX: Esthet-X, MF: Metafil Flo, ES: Estelite Sigma.

Figure 2

Shifts of a^* values on the Mustard background according to the thickness.

Figure 3

Shifts of b^* values on the Mustard background according to the thickness.

Figure 4

Color difference (ΔE^*) between Root dentin Mustard and integrated opaque resin at each thickness is over 10 in all thickness except ES. ST and MF are greater than others and ES shows the most little color difference.

Figure 5

Color difference (ΔE^*) between 3.0 mm opaque composite and integrated each thickness specimen is lesser than 3.3 on ST specimens regardless thickness. As the thickness of the specimen is decreased, color difference against the 3.0 mm specimen gradually increased.

Figure 6

1 mm specimens for opacity were made. The most highest value is 0.99 in ST and the opacity is in the decreasing order of ST, MF, Z350, PAL, UC, CHA, and EX. Every group shows statistical significant difference by one-way ANOVA and Student-Newman-Keuls method (p < 0.05).