This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Seghi, R.R. Search for Related Content PubMed PubMed Citation Articles by Seghi, R.R. Social Bookmarking                         What's this?

Effects of Instrument-measuring Geometry on Colorimetric Assessments of Dental Porcelains

University of California at Los Angeles, School of Dentistry, 10833 Le Conte Avenue, Los Angeles, California 90024

Recent developments in optical electronic instrumentation for color control have made the potential use of clinical photometric analysis a future possibility for dental materials selection and custom restoration design. The development of such instrumentation will require a more complete understanding of the performance of current technologies on translucent materials. This study was designed to evaluate the effects of instrument-measuring geometry on color-difference assessments made on dental porcelains. The results indicate that a high degree of correlation can exist between color-difference measurements regardless of the design of the instrument-measuring geometry. This work suggests that the development of clinically useful devices need not be restricted to more traditional integrating-sphere-type designs and that more photometrically efficient alternative designs should be explored.

REFERENCES

• Atkins, J.T. and Billmeyer, F.W., Jr. (1966): Edge-Loss Errors in Reflectance and Transmittance Measurement of Translucent Materials, Mater Res Stand 6:564-569.
• Billmeyer, F.W. (1965): Precision of Color Measurement with the GE Spectrophotometer. I. Routine Industrial Performance, J Opt Soc Am 55:707-717.
• Billmeyer, F.W. and Marcus, R.T. (1969): Effect of Illuminating and Viewing Geometry on the Color Coordinates of Samples with Various Surface Textures, Appl Opt 8:763-768.[CrossRef]
• Cie Publication No. 15.2 (1986): Colorimetry, Vienna: Central Bureau of the CIE, 74 pp.
• Clarke, F.J. (1972): High Accuracy Spectrophotometry at the National Physical Laboratory, J Res Natl Bur Stand 76A:375-403.
• Clarke, F.J. (1983): Measurement of Colour of Human Teeth in Dental Ceramics. In: Proceedings of the First International Symposium on Ceramics, J.W. McLean, Ed., Chicago: Quintessence Publ. Co., Inc., pp. 441-489.
• Hardy, A.C. (1929): A Recording Photoelectric Color Analyzer, J Opt Soc Am & Rev Sci Inst 18:96-117.[CrossRef]
• Hardy, A.C. (1935): A New Recording Spectrophotometer, J Opt Soc Am 25:305-311.[CrossRef]
• Hardy, A.C. (1945): Illuminating and Viewing Conditions for Spectrophotometry and Colorimetry, J Opt Soc Am 35:289-292.[CrossRef]
• Hsia, J.H. (1976): The Translucent Blurring Effect-Method of Evaluation and Estimation. NBS Technical Note 594-12. Oct., 25 pp.
• Hunter, R.S. (1987): The Measurement of Appearance, New York: John Wiley and Sons, 441 pp.
• Middleton, W.E. (1953): Comparison of Colorimetric Results from a Normal-Diffuse Spectrophotometer with Those from a 45-Degree-Normal Colorimeter for Semiglossy Specimens, J Opt Soc Am 43:1141-1143.[CrossRef]
• O'Brien, J. (1988): The Color of Teeth: An Instrumental Control Perspective. In: Perspectives in Dental Ceramics, J.D. Preston, Ed., Chicago: Quintessence Publishing Co., pp. 299-304.
• Rhodes, E.C. and Billmeyer, F.W., Jr. (1969): Precision of Color Measurement with the GE Spectrophotometer II: Photometric Accuracy, Appl Optics 8:769-773.[CrossRef]
• Rich, D.C. (1988): The Effect of Measuring Geometry on Computer Color Matching, Color Res Appl 13:113-118.[CrossRef]
• Seghi, R.R.; Johnston, W.M.; and O'Brien, W.J. (1986): Spectro-photometric Analysis of Color Differences Between Porcelain Systems, J Prosthet Dent 56:35-40.[CrossRef][Medline] [Order article via Infotrieve]
• Seghi, R.R.; Johnston, W.M.; and O'Brien, W.J. (1989): Comparative Performance Assessment of Colorimetric Devices on Dental Porcelains, J Dent Res 68:1755-1759.[Abstract/Free Full Text]
• Stenius, A.S. (1955): Influence of Optical Geometry and Absorption Coefficient on Diffuse Reflectance Values, J Opt Soc Am 45:727-732.[CrossRef]
• Weidner, V.R. (1983): White Opal Glass Diffuse Spectral Reflectance Standards for the Visible Spectrum (SRM's 2015 and 2016), NBS Special Publication 260-82, 21 pp.
• Weidner, V.R. and Hsia, J.J. (1981): Reflectance Properties of Pressed Polytetrafluoroethylene Powder, J Opt Soc Am 71:856-861.[CrossRef]

Journal of Dental Research, Vol. 69, No. 5, 1180-1183 (1990)
DOI: 10.1177/00220345900690051101


CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Seghi, R.R. Search for Related Content PubMed PubMed Citation Articles by Seghi, R.R. Social Bookmarking                         What's this?