前歯部挙上板と前歯・臼歯部挙上板が顎関節に及ぼす影響の相違に関する実験的研究

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The activator of Kyushu Dental College type allows molars without the occlusal surface grounded to participate in occlusion with the resin floor interposed ; whereas the conventional activator or biteplane has the occlusal surface of molars grounded and the molar regions are separated. Applications of these two types of activators result in differences in the mandibular position after operation. With the assumption that this difference is caused by whether molars are separated, the present experiment was conducted. Two kinds of biteplanes, those for anterior teeth and those for anterior teeth and molars, were mounted with adult dogs as the subjects, and the differences in the effect of those biteplanes on the mandibular condyle were examined histologically. The results were as follows : 1. As to width of the articular cavity, the central constricted region of the joint cavity in the ground with the biteplane for anterior teeth mounted showed severe constriction up to the 60 th day as compared with normal width. In the group with the biteplane for anterior teeth and molars mounted, slight enlargement was seen to the 20 th day and then normalcy was about restored by the 60 th day. 2. Bone addition in the mandibular condyle was marked from the middle to posterior regions in the group with the biteplane for anterior teeth mounted. In the group with the biteplane for anterior teeth and molars, bone addition was seen in the whole mandibular condyle. 3. Occurrence of bone addition was seen from the 20 th day and thereafter in the anterior teeth biteplane group. In the group with the biteplane for anterior teeth and molars mounted, on the other hand, bone addition was seen in the whole mandibular condyle from as early as the 10 th day. On the basis of the foregoing findings, it is suggested that the difference in the mechanism of action of these two devices is reflected in the positional relations of the mandibular condyle and mandibular fossa, and also affects treatment effect.
九州歯科学会の論文
1994-02-25

前歯部挙上板と前歯・臼歯部挙上板が顎関節に及ぼす影響の相違に関する実験的研究

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