The contrast ratio, light reflectivity, scattering coefficient, and absorption coefficient of four composites and an unfilled resin were calculated algebraically from reflection spectrophotometric data using Kubelka's equations. The correlation coefficient between calculated and experimental values of contrast ratio was 0.9996. Values of infinite optical thickness ranged from 4.19 to 6.70 mm.
Get full access to this article
View all access options for this article.
References
1.
Powers, J.M. ; Dennison, J.B.; and Lepeak, P.J.: Parameters that Affect the Color of Direct Restorative Resins, J Dent Res57:876-880, 1978.
2.
Kubelka, P. and Munk, F.: Ein Beitrag zur Optik der Farbanstriche, Zeit Tech Phys12:593-601, 1931.
3.
Paffenbarger, G.C.: Dental Silicate Cements, in: Judd, D.B., Optical Specification of Light-scattering Materials: RP 1026, J Res Nat Bur Standards19:314-316, 1937.
4.
Storey, B.E. and Jeffrey, I.W.M.: The Clinical Implications of Some Optical Properties of Silicate Cement , J Dent2:77-84, 1973/74.
5.
Crisp, S.; Abel, G.; and Wilson, A.D.: The Quantitative Measurement of the Opacity of Aesthetic Dental Filling Materials , J Dent Res58:1585-1596, 1979 .
6.
Judd, D.B.: Optical Specification of Light-scattering Materials, RP 1026, J Res Nat Bur Standards19:287-317, 1937.
7.
Kubelka, P.: New Contributions to the Optics of Intensely Light-scattering Materials. Part I, J Opt Soc Am38:448-457, 1948.
8.
Wyszecki, G. and Stiles, W.S.: Color Science, New York: Wiley and Sons, Inc., 1967, p. 276.
9.
University of Michigan, Statistical Research Laboratory: A Manual of Elementary Statistics using MIDAS, Ann Arbor , Statistical Research Laboratory, 1975, 301 p.
10.
Guenther, W.C.: Analysis of Variance, Englewood Cliffs, NJ: Prentice-Hall, 1964, 199 p.
11.
Judd, D.B.: Fresnel Reflection of Diffusely Incident Light, RP 1504, J Res Nat Bur Standards29:329-332, 1942.
