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解讀下顎髁生長的奧秘

The Raison D'etre of the Mandibular Condyle

摘要


有關下顎髁組織結構的爭議,已得到較具決定性的結論;學者指出下顎髁的表層細胞有兩種不同的造骨能力,一種是變為軟骨細胞供個體渡過生長期,一種是轉變為硬骨,以取代消失的軟骨組織,繼續在顳顎關節內執行功能。下顎髁與連結上下顎的軟組織,包括關節囊、關節盤、關節液等非肌肉組織,以及顳骨的關節窩及關節突起,均有完善的調適生長能力以應付外來環境的改變。臨床學家因為使用功能矯正器或顳顎外科手術治療骨性咬合異常,可快速改變下顎骨位置,正可觀察及考驗顳顎關節的適應能力,並用實驗動物來驗證相關部位的變化,對TMJ的知識累積也功不可歿。文獻探討不僅有助於矯正治療成果的改進與檢討,也可提供治療的新契機。

關鍵字

下顎髁 調適生長

並列摘要


The mandibular condyle has a multi-directional growth capacity due to the fact that cells deeply located in the fibrous covering is a prechondroblastic zone which undergoing continued proliferation during active growth. The whole histogenetic process allows for the ramus to lengthen in a pressure site. The adaptive nature of the condylar growth is the main source in scientific validation of functional orthopedic concept and therapy. Bio-dynamic factors which can stimulate the growth of the mandibular condyle and glenoid fossa have been speculated with clinical and experimental studies. The reversing effects of treatment on growth direction and changes in size and morphology of the condyle were also noted. Because of increasing number of adults seeking orthodontic care, an understanding of the details of TMJ growth and developmental changes that normally take place till adulthood, or could be seen in abnormal compensatory responses has become critical.

延伸閱讀


國際替代計量