Measurements of scattering anisotropy in dental tissue and zirconia ceramic

Alicia Fernández-Oliveras; Oscar E. Pecho; Manuel Rubiño; María M. Pérez

doi:10.1117/12.921229

8 May 2012 Measurements of scattering anisotropy in dental tissue and zirconia ceramic

Alicia Fernández-Oliveras, Oscar E. Pecho, Manuel Rubiño, María M. Pérez

Proceedings Volume 8427, Biophotonics: Photonic Solutions for Better Health Care III; 84272C (2012) https://doi.org/10.1117/12.921229
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

Knowledge of the optical properties of biological structures is useful for clinical applications, especially when dealing with incoming biomaterials engineered to improve the benefits for the patient. One ceramic material currently used in restorative dentistry is yttrium cation-doped tetragonal zirconia polycrystal (3Y-TZP) because of its good mechanical properties. However, its optical properties have not been thoroughly studied. Many methods for the determination of optical parameters from biological media make the assumption that scattered light is isotropically distributed over all angles. Nevertheless, real biological materials may have an angular dependence on light scattering, which may affect the optical behaviour of the materials. Therefore, the recovery of the degree of anisotropy in the scattering angular distribution is important. The phase function that represents the scattering angular distribution is usually characterized by the anisotropy coefficient g, which equals the average cosine of the scattering angle. In this work, we measured angularscattering distributions for two zirconia ceramic samples, pre-sintered and sintered, with similar thicknesses (0.48 mm and 0.50 mm, respectively) and also for a human dentine sample (0.41 mm in thickness). The samples were irradiated with a He-Ne laser beam (λ = 632.8 nm) and the angular-scattering distributions were measured using a rotating goniometer. The g values yielded were: -0.7970 ± 0.0016 for pre-sintered zirconia, -0.2074 ± 0.0024 for sintered zirconia and 0.0620 ± 0.0010 for dentine. The results show that zirconia sintering results in optical behaviour more similar to those of dentine tissue, in terms of scattering anisotropy.

Citation Download Citation

Alicia Fernández-Oliveras, Oscar E. Pecho, Manuel Rubiño, and María M. Pérez "Measurements of scattering anisotropy in dental tissue and zirconia ceramic", Proc. SPIE 8427, Biophotonics: Photonic Solutions for Better Health Care III, 84272C (8 May 2012); https://doi.org/10.1117/12.921229

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