下顎骨オトガイ部骨折の変形治癒による咬合異常がイヌ顎関節に及ぼす影響に関する実験的研究

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Experimental segmental resection including teeth was performed in the range from canine median mandibular through right lower central, intermediate and angular teeth, and the stumps were put together firmly in bolt fixation, being kept at a deformed healing state. The influence of subsequent malocclusion on temporomandibular joint was examined pathohistologically. The results obtained are as follows : 1. The articular fossa・lateral angular region showed bone resorption from the 5th postexperimental day and its peak on the 240th day on the left side and on the 30th∿90th day on the right side. Bone resorption decreased thereafter and disappered. 2. The articular fossa cartilaginous layer became thicker as a whole on both sides at lateral angular region from the 5th to 90th day and thereafter gradually decreaseed to return to the original on the 240th day. Tr-z was scarcely noted throughout the period, while Ca-z was noted partially hypertrophic on the 365th and 90th days on the left and right sides, respectively. 3. The articular disc began to show uneven stainability and thickness on both sides from the 5th day and to a remarkable extent especially internal-externally, with the occurrence of interfiber bundle bending, dispersion and occasional rupture. 4. Bone resorption which gradually started following the start of the experiment at condyle head・inter-external angular region increased in scope and depth with time, reaching its peak at the both sides, and disappeared from the 240th day on. 5. Osteoplasty was noted on the left side at condyle head・lateral angular region on the 60th day and to an extensive and thick extent on both sides on the 240th day. 6. The condyle head tended to project externally. 7. The condyle head cartilaginous layer tended to be hypertrophic for Ta-z in the whole regions, and to remarkable extent especially at lateral angular region. Tr-z and Ra-z were scarcely noted in any one of the regions, and Ca-z, though partially hypertrophic, tended to be decreasing. 8. No distinct difference in these findings was noted between both temporomandibular joints. The above results suggest that earlier and more remarkable changes occur in temporomandibular joints in case of malocclusion due to mandible deformed healing than in case of malocclusion due to the loss of the tooth. However, it was also revealed that all of condyle head, articular fossa and articular disc proceeded in reconstruction and functioned as integrated temporomandibular joints while adapting themselves to any abnormal environment.
九州歯科学会の論文
1990-12-25

下顎骨オトガイ部骨折の変形治癒による咬合異常がイヌ顎関節に及ぼす影響に関する実験的研究

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