骨結合型インプラントを利用した下顎運動時の下顎骨体の歪測定

Abstract

In this study the mandibular distortion during mandibular movement was measured. The subjects were three females and one male. Two apatite implants were placed in a unilateral mandibular molar region at an interval of about 10 mm. The measuring apparatus consisted of a magnetic sensor attached to the medial implant and a magnet attached to the distal implant. The position of the distal implant relative to the medial implant during opening and protrusion of the mandible were measured six times every movement.At the maximum opening the position of the distal implant was deviated lingually in the range of 8 to 25 pm and at the maximum protrusion it was also deviated lingually in the range of 10 to 37 μm.These findings suggest that the stress concentration on the implant and surrounding bone is caused by mandibular distortion during mandibular movements if several superstructures of implants inserted in the mandibular molar region are connected firmly. In other words, it is important for the mandibular position at the impression and soldering operation procedure for the fabrication of the superstructure to decrease the stress.