Absolute Radiographic Densities of Dentin and Enamel

Publisher Website
Google Scholar
Abstract
Absolute radiographic density determinations were done using the Joyce-Loebl recording microdensitometer on ground sections of fresh human tooth. The technique involves rapid computer correlations of the area under the logarithmic form of the densltometric tracing. The total tissue in the tooth section is determined from the equation describing attenuation of X-rays through homogeneous material corrected for film characteristics, processing factors and background density differences: [mu]A = (b-a) 1n (Dm-Do) - b[image]a 1n (D - Do)dx where [mu] is expressed in mm-1, Ab is cross sectional area, (b-a) is distance traced across specimen image, In is the symbol for natural logarithm, Dm is maximum film density, Do is background film density and D is measured density. The tooth material used has a known cross sectional area making it possible to calculate [mu] alone, which is 0.35 mm-1 for enamel and 0.24 mm-1 for dentin, giving a [mu] enamel/[mu] dentin ratio of 1.46. The value of previously computed [mu] of fresh bovine bone (0.23 mm-1) is similar to that of dentin.

This publication has 0 references indexed in Scilit: