根面板のデザインの違いが側方力発現におよぼす影響
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概要
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Since an excellent magnetic attachment had been developed, it have been conducted an opportunity to aware of the importance of utilizing the remaining root, tooth-supported complete dentures with or without mechanical attachments, which are increasingly a part of the routine dental services offer to patients in recent years. Conserving the remaining natural root has several advantages which include less bone loss in the mandible and maxilla, improvement of proprioceptive guidance, maintenance of the vertical dimension of occlusion, psycologic benefit to the patient, and improvement of stability and retention of dentures. Since the designs of abutment tooth are controversal, although the tooth-supported dentures are benefical, this study was initiated to determine the most excellent abutment design by comparing the horizontal movement of lower canine root abutment with ten different desings for tooth-supported dentures. The ten designs of abutment tooth for tooth-supported complete denture tested were (1) the short coping of 4mm in vertical height above the crest of the ridge, (2) the long coping of 8mm in vertical height above the crest of the ridge, (3) the short coping with a magnetic attachment, (4) the long coping with a magnetic attachment, (5) the short coping with OP Anchor attachment, and the others were designs which were given the relief chamber to each of the above designs. All the dentures, however, were constructed to rest directly on the coping or the coping with mechanical attachment. The tooth movement was measured in horizontal plane by two laser displacement sensors on a simulation model. The obtained results were as follows : 1) The abutment tooth with the various coping designs tested by this experiment tipped not only to distolingual direction, but also to mesiobuccal direction under load. 2) Different positions of applying load generated different amount of movement and direction of the abutment tooth. 3) When the relief chamber was prepared around the coping, it tended to produce a great deal of torque on the abutment. Above results would facilitate the use of tooth-supported dentures with clinical success.
- 1995-12-25