Clarke N G, Hirsch R S
Department of Dentistry, University of Adelaide, South Australia.
Am J Phys Anthropol. 1991 Jul;85(3):293-8. doi: 10.1002/ajpa.1330850307.
Tooth dislocation (tilting) was recorded in 1,200 skulls from 34 museum collections. The findings of dislocation by tooth type, tooth wear, and abscess location are presented. A model for dislocation based upon the progressive loss of tooth support provides a rational explanation for the phenomenon. Physiological continuous tooth eruption was considered to account for a component of the progressive loss of tooth attachment. The process of attrition, pulp perforation, and dental abscess cavity formation resulted in further, more severe loss of tooth support. Heavy functional forces, in association with greatly reduced bone support, tilted the crown lingually and root buccally. When the tooth had tilted to such an extent that the root apices protruded from the bone and, presumably (in life) through the gingival/mucosal tissues, the infected root canals were effectively isolated from the internal environment. The tooth continued to function. The more typical consequence of severe attrition and dental abscess formation was tooth loss; it also isolated an infected tooth from living tissue, but without the benefit of retaining function.
在来自34个博物馆藏品的1200个颅骨中记录了牙齿脱位（倾斜）情况。本文呈现了按牙齿类型、牙齿磨损及脓肿位置分类的脱位研究结果。基于牙齿支持组织逐渐丧失的脱位模型为该现象提供了合理的解释。生理性牙齿持续萌出被认为是牙齿附着逐渐丧失的一个因素。磨耗、牙髓穿孔及牙脓肿腔形成的过程导致了牙齿支持组织进一步更严重的丧失。强大的功能作用力，再加上骨支持大幅减少，使牙冠向舌侧倾斜、牙根向颊侧倾斜。当牙齿倾斜到牙根尖从骨中突出且大概在生前穿出牙龈/黏膜组织的程度时，感染的根管就有效地与体内环境隔离开来。牙齿仍继续发挥功能。严重磨耗和牙脓肿形成更典型的后果是牙齿脱落；它也使感染的牙齿与活组织隔离开，但没有保留功能的好处。
