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Eruption, attrition, and crown length were measured in impeded and unimpeded rat incisors in hypophysectomized and magnesium-deficient rats. The rate of unimpeded eruption was twice the rate of impeded eruption; this proves that the rates of eruption and attrition are determined by the amount of occlusal contact and the condition of the periodontal ligament.
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Kusner et al. (1973) studied this question.