舌の形態と機能の変化が歯の植立位置に及ぼす影響に関する実験的研究
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概要
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The tongue is considered to be an important factor for maintenance and stability of the morphology of the dental arch. Effect of changes in the morphology and function of the dental arch however has not yet been clarified. Effect of reduction and enlargement of the tongue of rats on the tooth position and effect of removal of muscle function on tooth position by excision of the medial nerve or lateral nerve of the hypoglossal nerve therefore were investigated histopathologically. In control group, the upper molars extruded lingually and the lower molars inclined bucally. The upper and lower incisor teeth displaced labially. In the reduced tongue groups, the upper and lower bilateral molars inclined lingually. The lower incisor teeth however showed no displacement. In the enlarged tongue group, the upper and lower bilateral molars showed buccal inclination and the lower incisor teeth slight lingual inclination. In both the right medial nerve excision group and lateral nerve excision group, the upper and lower bilateral molars showed marked extrusion. The degree of extrusion in the lateral nerve excision group was a little less than that in medial nerve excision group. The lower incisor teeth in the lateral nerve excision group showed lingual displacement. The upper incisor teeth in all groups showed no difference as compared with those of control group. On the basis of the foregoing findings, the morphology and the function of the tongue plays an important role as a factor in determination of tooth positions.
- 九州歯科学会の論文
- 1992-02-25