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  • Title: Experimental evaluation of initial tooth displacement, center of resistance, and center of rotation under the influence of an orthodontic force.
    Author: Yoshida N, Jost-Brinkmann PG, Koga Y, Mimaki N, Kobayashi K.
    Journal: Am J Orthod Dentofacial Orthop; 2001 Aug; 120(2):190-7. PubMed ID: 11500662.
    Abstract:
    The purpose of this study was to determine the location of the center of resistance and the center of rotation of the maxillary central incisors under the influence of a single simple force and to investigate related geometric parameters of the teeth and the surrounding periodontal tissues. By measuring the initial displacement of the central incisors with a magnetic sensing system, the location of the center of resistance and the centers of rotation associated with various forces were determined in 3 human subjects. The results show that the location of the center of resistance of the maxillary central incisor depends on the palatal bone level and is at approximately two-thirds of the palatal alveolar bone height, measured from the root apex. A greater moment-to-force ratio is needed for any controlled movement of the maxillary incisors during retraction in patients with reduced palatal alveolar bone height. This study suggests a method for estimating the location of the center of resistance of a tooth.
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