Tooth movements are guided by specific contact areas between the tooth root and the jaw bone: A dynamic 3D microCT study of the rat molar
Tooth movements are guided by specific contact areas between the tooth root and the jaw bone: A dynamic 3D microCT study of the rat molar
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DOI：
10.1016/j.jsb.2011.11.019
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发表时间：
2012-02-01
影响因子：
3
通讯作者：
Weiner, Steve
中科院分区：
文献类型：
--
作者：
Naveh, Gili R. S.;Shahar, Ron;Weiner, Steve
牙齿在一生中承受高负荷，但完整的牙齿失效是罕见的。牙齿、颌骨和中间的软牙周韧带的不同结构使牙齿能够在咀嚼时承受反复的负荷。虽然不同部件的机械和功能特性被彻底研究，但整个牙齿在载荷下的功能方式仍然是谜。在微型ct扫描仪内使用定制的加载系统，直接观察大鼠磨牙加载时牙根与颌骨的运动情况。在低负荷下，牙根表面与颌骨之间没有接触，而在高负荷下，牙根表面与颌骨之间有三个特定的接触区域。这些接触区域限制牙齿在颊-舌方向上的运动，但使牙齿在远-近方向上以“跷跷板”的方式摇摆。接触区域似乎在决定牙齿运动中起作用，反过来又决定了整个牙齿在加载时移动的方式。这些观察结果对于理解牙齿- pdl -骨系统的基本结构-功能关系具有重要意义，并对更好地理解正畸、牙周病和颌骨再生的病理和治疗过程具有直接意义。(C) 2011爱思唯尔公司版权所有。
Teeth sustain high loads over a lifetime and yet intact tooth failure is rare. The different structures of the tooth, jaw bone and the intervening soft periodontal ligament enable the tooth to endure repeated loading during mastication. Although mechanical and functional properties of the different components are thoroughly investigated, the manner in which the whole tooth functions under load is still enigmatic. A custom-made loading system inside a microCT scanner was used to directly visualize the root movements in relation to the jaw bone as the rat molar tooth was loaded. At low loads no contact was observed between the root surface and the bone, whereas at higher loads three specific contact areas between the root surface and the jaw bone were observed. These contact areas restrict tooth movement in the buccal-lingual direction, but enable the tooth to rock in a "seesaw" like manner in the distal-mesial direction. The contact areas appear to play a role in determining tooth motion and in turn define the manner in which the whole tooth moves when loaded. These observations are important for understanding basic structure-function relations of the tooth-PDL-bone system, and have direct implications for better understanding pathological and therapeutic processes in orthodontics, periodontics and jaw bone regeneration. (C) 2011 Elsevier Inc. All rights reserved.