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The anteroposterior tooth contact position through small opening and closing movement of the mandible under various kinds of posture and opening closing conditions



The anteroposterior tooth contact position through small opening and closing movement of the mandible under various kinds of posture and opening closing conditions



Shikwa Gakuho 80(1): 1-31



In cases in which intercuspal position was lost, tapping movements under conditons of habitual mandibular opening and closing movements is an efficient method to establish maxillomandibular relation. Conditions for tapping to reconstruct the intercuspal position in patients who have lost intercuspal position were studied. An electro-optical displacement transducer was used to measure the mandibular position in the sagittal plane, and measurements were made of 5 dentulous subjects who had a normal stomatognathic system and a clear intercuspal position. Mandibular positions for antero-posterior tooth contact performed in habitual small opening and closing movements were investigated under conditions such as inclination of the trunk, inclination of the head, various opening distances and various opening and closing speeds. When the trunk was held vertical, anteriorly inclined head positions made tooth contact positions more anterior. Posteriorly inclined head positions made tooth contact positions more posterior. When the trunk was in a horizontal position, tooth contact positions shifted further to the rear than when the trunk was held vertically. As the head was moved from a front-inclined to a rear-inclined position based on a Frankfort plane in a vertical position, posterior tooth contact tended to increase. The antero-posterior ranges of tooth contact positions were wide when the mandible was opened and closed slowly. Wider openings produced a wider antero-posterior range of tooth contact positions. To establish the horizontal mandibular position required for intercuspation by tapping based on habitual opening and closing movement of the mandible, the elements for good clinical results are listed.

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