The effects of mandibular immobilization on the monkey masseter muscle: An ultrastructural and cytochemical study.
スポンサーリンク
概要
- 論文の詳細を見る
The effects of mandibular immobilization on the monkey masseter muscle were studied histochemically and ultrastructurally. Mg<SUP>2+</SUP>-ATPase activity was observed cytochemically.<BR>Mandibles were immobilized by intermaxillary wire fixation in the intercuspal position. The masseter muscle was examined at 1, 4, 6 and 8 weeks after immobilization.<BR>Histopathologically, fiber diameters were slightly reduced after 4 weeks of immobilization; these changes continued after longer periods of immobilization. Histochemically, no specific changes were detected. Ultrastructurally, myofibril architectural changes included a partial reduction in numbers and fragmentation of the Z-line at 1 week after immobilization. Granular electron-dense materials were noted among the myofibrils. The degenerating zone of the fi ber increased at 4, 6 and 8 weeks after immobilization. Central core structures and tubular aggregates were found in the muscle fiber at 6 weeks post immobilization. At 6 and 8 weeks segmental necrosis of the fiber was noted. The Mg<SUP>2+</SUP>-ATPase activity in the normal masseter muscle was localized in the sarcolemmae, caveolae, terminal cisternae of the sarcoplasmic reticulum and matrices of mitochondria. At 8 weeks Mg<SUP>2+</SUP>-ATPase activity decreased as compared with control muscle.<BR>Immobilization of the mandible results in various morphological and cytochemical changes in masseter muscle. It is suggested that degeneration of the masseter muscle is an important factor in dysfunction occurring after release of intermaxillary fixation.
- 社団法人 日本口腔外科学会の論文
著者
関連論文
- 粘液線維腫の電顕的および細胞化学的観察
- 分葉状に発育した上顎のエナメル上皮線維腫の1例
- 左側頬粘膜部に発生した腺房細胞腫の1例 : 光学顕微鏡的および電子顕微鏡的観察
- 大阪歯科大学第1口腔外科における過去5年間の病理組織学的検査の臨床統計的観察
- 上唇に発生した類皮および類表皮嚢胞の1例
- 顎関節外科における局所解剖-特に顔面神経との関係について-
- The effects of mandibular immobilization on the monkey masseter muscle: An ultrastructural and cytochemical study.