J Korean Acad Conserv Dent.  2011 May;36(3):219-230. 10.5395/JKACD.2011.36.3.219.

Optical characteristics of resin composite before and after polymerization

• Eom AH
• Kim DS
• Lee SH
• Byun CW
• Park NH
• Choi KK

• KMID: 1986686
• DOI: http://doi.org/10.5395/JKACD.2011.36.3.219

Abstract

OBJECTIVES
The aim of this study was to evaluate the optical characteristics such as color and translucency changes before and after light curing, to quantify the CQ and to measure refractive indices of body and opaque shade of resin composites materials.
MATERIALS AND METHODS
Resin composites used in this study were A2 body and A2 opaque shade of Esthet-X, Filtek supreme, Gradia Direct, Clearfil Majesty and Beautifil?? Color and translucency changes before and after light curing were evaluated by colorimeter, the CQ was quantified by GC-MS and refractive index changes were measured by spectroscopic ellipsometer.
RESULTS
Translucency parameter (TP) was significantly increased after curing. The CQ content of body shades are higher than that of opaque shades in all resin composites. Refractive index increased after polymerization in all materials and significant difference in Deltarefractive index was found between body and opaque shade (significance level 0.05).
CONCLUSIONS
For an accurate shade match, direct shade matching of resin composite should be performed by using the cured material.

Keyword

Color; CQ content; Refractive index; Resin composite; Translucency

MeSH Terms

Composite Resins
Light
Polymerization
Polymers
Refractometry
Composite Resins
Polymers

Figure

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  Figure 1 Calibration curve of CQ.

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  Figure 2 Change of L*.

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  Figure 3 Change of b*.

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  Figure 4 TP before and after curing.

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  Figure 5 Change of translucency parameter.

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  Figure 6 CQ content (%p/p).

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  Figure 7 Correlation between CQ content and ΔE*.

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  Figure 8 Refractive index before and after curing.

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  Figure 9 Change of refractive index.

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  Figure 10 Correlation between Δrefractive index and Δtranslucency parameter.

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