Abstract
This report represents the first part of a study concerned with pulp and dentine reactions during tooth movement, The experimental material consisted of thirty-five intact teeth from children aged 10 to 13 years. These teeth were intruded with forces ranging from 35 to 250 Gm. with fixed appliances under controlled conditions for 4 to 35 days. All these teeth were extracted immediately after the force was removed. A similar number of untreated teeth served as controls. The main pulp changes in the experimental material included vacuolization of the pulp tissue and circulatory disturbances. Teeth with completed apices exhibited more severe changes than teeth with open apices, and the magnitude of the force was also important. In the teeth with incomplete root development, disturbances in the root formation frequently occurred. The resorption observed in dentine was related to the magnitude of the force and the duration of the experiment.
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