Abstract
Sixty deciduous teeth with their epithelial attachment were extracted prior to, at and after their expected time of exfoliation. They were classified into preshedding, shedding and delayed shedding groups according to the age of the patient when extracted and their stage of root resorption. From preshedding to shedding stages, the number of pulps containing odontoclasts increased. Delayed exfoliation was accompanied by a decrease in pulps involved by odontoclasts. The migration of the crevicular epithelium to the resorbing surface appears to be due to resorption of the root rather than apical migration of the epithelial attachment. The migration of the epithelial attachment to the resorbing surface was associated with an increase in the number of pulps infiltrated by polymorphonuclear leukocytes.
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