Abstract

This research involves the study of the diffuse reflectance of esthetic dental materials (i.e., porcelain and composite restorative materials). Mathematical models will be derived and evaluated for application to these optically non-homogeneous materials. At present, the development of new materials with superior mechanical and wear properties is hindered by a lack of understanding of the complex optical phenomena that underlies the natural appearance of these materials. The effects of absorption, specular reflectance and scattering will be predicted by the mathematical model and compared with experimental data. In addition, experiments on the sensitivity of observers to detect apparent translucency differences will be assessed. The general and basic nature of this research will give a solid basis for the understanding of the simulation of translucency by widely used clinical restorative materials.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Institute of Dental & Craniofacial Research (NIDCR)
Type
Research Project (R01)
Project #
5R01DE005423-06
Application #
3219420
Study Section
Oral Biology and Medicine Study Section (OBM)
Project Start
1980-03-01
Project End
1987-12-31
Budget Start
1985-09-01
Budget End
1987-12-31
Support Year
6
Fiscal Year
1985
Total Cost
Indirect Cost

  Institution

Name
University of Michigan Ann Arbor
Department
Type
Schools of Dentistry/Oral Hygn
DUNS #
791277940
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109

  Publications

O'Brien, W J; Boenke, K M; Linger, J B et al. (1998) Cerium oxide as a silver decolorizer in dental porcelains. Dent Mater 14:365-9
O'Brien, W J; Hemmendinger, H; Boenke, K M et al. (1997) Color distribution of three regions of extracted human teeth. Dent Mater 13:179-85
O'Brien, W J; Fan, P L; Groh, C L (1994) Color differences coefficients of body-opaque double layers. Int J Prosthodont 7:56-61
Mora, G P; O'Brien, W J (1994) Thermal shock resistance of core reinforced all-ceramic crown systems. J Biomed Mater Res 28:189-94
Groh, C L; O'Brien, W J; Boenke, K M (1992) Differences in color between fired porcelain and shade guides. Int J Prosthodont 5:510-4
O'Brien, W J; Kay, K S; Boenke, K M et al. (1991) Sources of color variation on firing porcelain. Dent Mater 7:170-3
O'Brien, W J; Groh, C L; Boenke, K M (1990) A new, small-color-difference equation for dental shades. J Dent Res 69:1762-4
Seghi, R R; Johnston, W M; O'Brien, W J (1989) Performance assessment of colorimetric devices on dental porcelains. J Dent Res 68:1755-9
White, J M; O'Brien, W J (1989) The colors of mixtures of dental opaque porcelains. J Dent Res 68:1319-22
O'Brien, W J (1988) Fraunhofer diffraction of light by human enamel. J Dent Res 67:484-6

Showing the most recent 10 out of 17 publications