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Relevant optical properties for gingiva-colored resin-based composites
Cristina Lucena1, Cristina Benavides-Reyes1, Javier Ruiz-López2
1Department of Stomatology, Faculty of Dentistry, Colegio Máximo, Campus de Cartuja s/n. University of Granada. 18071. Granada. Spain.
Journal of Dentistry
|October 4, 2022
Summary
Optical properties of gingiva-colored resin-based composites (GCRBCs) vary significantly. These differences in translucency, scattering, and absorption impact masking ability and shade matching for dental restorations.
Area of Science:
- Dental Materials Science
- Optical Physics
- Biomaterials
Background:
- Gingiva-colored resin-based composites (GCRBCs) are crucial for aesthetic dental restorations.
- Understanding their optical properties is essential for predictable shade matching and masking ability.
Purpose of the Study:
- To quantitatively evaluate the optical properties of various GCRBC shades.
- To determine the impact of these properties on translucency and potential shade discrepancies.
Main Methods:
- Prepared 17 shades of GCRBC discs and measured diffuse reflectance.
- Calculated relative translucency parameter (RTP00) and compared with perceptibility thresholds.
- Determined scattering (S) and absorption (K) coefficients and transmittance (T%) using Kubelka-Munk equations.
Main Results:
- RTP00 values varied significantly across shades (8.69-21.34).
- Perceptible translucency differences existed between shades of the same brand and between different brands of the same shade.
- Scattering, absorption, and transmittance showed wavelength dependency and significant inter-shade variations.
Conclusions:
- Significant differences in optical properties (S, K, T%) of GCRBCs lead to perceptible translucency variations.
- These variations affect shade matching and the masking ability of dental composites.
