<ORIGINAL ARTICLE>A study of the transfer characteristics the impact applied to the tooth crown on the Periradicular : The upper central incisor and lower first molar

P(論文)Investigations were carried out using static and dynamic loads, to clarify the mecanism by which the biting force applied to a tooth is transmitted to periodntal tissue. There are several reports the characteristics of transmission of vibrations from biting forces applied to a tooth using dynamic loads, but the characterisitics of transmission to the periradicular have not been elucidated. In this study, the impact was applied with vibrations, to an artificial planted tooth model, and from the level of vibrations and the volume of vibrations transmitted, the investigated vibration transfer characteristics on the periradicular of the upper central incisor and the lower firstmolar. The following results were obtained. 1. The component of impact applied to the central region of the upper central incisor margin spread out mainly of vibrations labiolingual in the direction on the periradicular. The transmitted volume of vibrations in the periradicular increased on the lingual and distal sides, and decrdecreased on the labial, mesial and root apex sides. 2. The component of impact applied to the distobuccal cusp of the lower first molar spread mainly in the direction of the buccolingal on the periradicular buccal and lingal sides, buccolingally and mesiodistally on the periradicular mesial side, and mesiodistally on the periradicular distal side. The transmitted volume in the periradicular increased on the buccal and mesial sides, and decreased on the root apex side. 3. The upper central incisor and lower first molar artificial roots of teeth confirmed the expected characteristics of rationally doings the transmission of the impact.departmental bulletin pape