Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength

Ji-A Yoo; Byeong-Hoon Cho

doi:10.5395/JKACD.2011.36.4.324

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Yoo and Cho: Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength

Basic Research

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2011; 36(4): 324-335.

Published online: 31 July 2011

DOI: https://doi.org/10.5395/JKACD.2011.36.4.324

Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength

Ji-A Yoo, BS¹, Byeong-Hoon Cho, DDS, Ph.D²

Graduate Student

Professor

¹Department of Dentistry, Seoul National University School of Dentistry, Seoul, Korea.

²Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea.

Correspondence to Byeong-Hoon Cho, DDS, PhD. Professor, Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, 28-2 Yeongeon-dong, Jongro-gu, Seoul, Korea 110-749. TEL, +82-2-2072-3514; FAX, +82-2-764-3514; chobh@snu.ac.kr

Received 29 January 2011 Revised 8 March 2011 Accepted 5 July 2011

Abstract

Objectives

This study investigated the effects of the color components of light-cured composite resin before and after polymerization on degree of conversion (DC) and biaxial flexural strength (FS).

Materials and Methods

Four enamel shades (A1, A2, A3, A4) and two dentin shades (A2O, A3O) of Premisa (Kerr Co.) and Denfil (Vericom Co.) were evaluated on their CIE L^*, a^*, b^* color components using the spectrophotometer before curing, after curing and at 7 day. The DC of same specimens were measured with Near-infrared spectrometer (Nexus, Thermo Nicolet Co.) at 2 hr after cure and at 7 day. Finally, the FS was obtained after all the other measurements were completed at 7 day. The correlations between each color component and DC and FS were evaluated.

Results

The light-curing of composite resin resulted in color changes of Premisa in red-blue direction and Denfil in green-blue direction. The DC and FS were affected by product, time and shade (3-way ANOVA, p < 0.05) and product and shade (2-way ANOVA, p < 0.05), respectively. Premisa only showed a significant correlation between the DC and CIE a^* component - before and after polymerization (Pearson product moment correlation, p < 0.05). The FS of Premisa showed significant negative correlations with CIE a^* and CIE b^* components.

Conclusions

The DC and FS of the light-curing composite resin were affected by the color components of the material before and after polymerization.

Keywords: Biaxial flexural strength, CIE Lab^*, Degree of conversion, Light-cured composite resin, Shade

Figures and Tables

Figure 1

Measurement assembly for measuring biaxial flexural strength. The assembly had a specimen support and a loading steel rod, which was used in a universal testing machine. For the support of the test specimen, three steel balls with a diameter of 3.0 mm, positioned 120° apart on a support circle with a diameter of 10 mm, was provided. The sample was placed concentrically on these supports and the load was applied with a flat punch with a diameter of 1.5 mm at the center of the specimen.

Figure 2

Changes in CIE L^* values of each shade of (a) Premisa and (b) Denfil. Both products showed a relatively great decrease in the value (lightness) of each shade after curing. However, until 7 days, the values were a little increased.

Figure 3

Changes in CIE a^* values of each shade of Premisa and Denfil. (a) The products of Denfil showed a relatively great decrease in the redness of each shade after curing. However, until 7 days, the values were a little increased. (b) The products of Premisa showed a gradual increase in the redness of each shade after curing.

Figure 4

Changes in CIE b^* values of each shade of (a) Denfil and (b) Premisa. Both products showed a gradual decrease in the yellowness of each shade after curing.

Figure 5

Changes in degree of conversion (%) of each shade of (a) Denfil and (b) Premisa. Both products showed a gradual increase in the degree of conversion of each shade from 2 hours after curing to 7 days.

Table 1

Compositions of resin matrix and fillers of the resin composites used in this study

^*Data described in this table were provided by the manufacturers.

Bis-GMA, Bisphenol A glycidyl methacrylate; TEGDMA, Triethylene glycol dimethacrylate; Bis-EMA, Ethoxylated bisphenol A dimethacrylate; PPF, Prepolymerized filler.

Table 2

Degree of conversion (DC) of two commercial dental composite resins measured at 2 hours and on 7 days after light-curing according to the shades (DC, mean ± SD; No., 10; unit, %)

Table 3

Biaxial flexural strength of two commercial dental composite resins measured on 7 days after light-curing according to the shades (FS, mean ± SD; No., 10; unit, MPa)

Table 4

Pearson product moment correlation between degree of conversion and biaxial flexural strength and shade components of each product measured before and after light-curing

Notes

This work was supported by the Korea Research Foundation (KRF) grant funded by the Korean government (MEST, No. 2009-0070771).

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ORCID iDs: Byeong-Hoon Cho
https://orcid.org/http://orcid.org/0000-0001-9641-5507
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