Abstract
Sections of 37 human canine teeth, 7 unerupted, cut transversely at 3 levels occlusal to the pulp, were microradiographed; tubules were counted in groups according to the degrees of tubule closure. In unerupted teeth, there was no consistent variation with age in the numbers of the 4 types of tubule at any level of section, or between the levels of single teeth. With attrition scores 0, 2 and 3, peritubular dentine increased progressively with age, a pattern less evident with attrition score 1. When attrition and age were controlled statistically, tubule closure decreased markedly from outer to inner levels and open tubule counts increased markedly in the same direction. Volume fraction analysis on sections from an intermediate level showed that peritubular dentine increased markedly with attrition, and the tubular lumen reduced reciprocally. The amount of intertubular dentine remained constant. Kendall partial rank correlation coefficients showed a closer relationship between attrition and tubule closure than between age and tubule closure in erupted teeth.
Published Version
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