Dacre I T, Kempson S, Dixon P M
Division of Veterinary Clinical Science, The Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Easter Bush Veterinary Centre, Midlothian EH25 9RG, UK.
Vet J. 2008 Dec;178(3):341-51. doi: 10.1016/j.tvjl.2008.09.028. Epub 2008 Nov 18.
Examination of 41 extracted, apically infected mandibular cheek teeth (CT) without obvious causes of infection included radiography, computerised axial tomography and decalcified and undecalcified histology. In CT with recent infections, some pulps remained viable, with proliferative soft and calcified tissue changes confined to the apex. With more advanced CT infections, occlusal pulpar exposure was sometimes present (in 34% of the 41 CT), some infected pulp chambers were filled with necrotic pulp or food, and extensive destructive or proliferative changes were present in the calcified apical tissues. No physical route of infection to the apex was found in 24 CT (59%) that consequently were believed to have anachoretic infections. Fractures involving pulps, including fissure fractures between the clinical crown and infected pulps, were found in eight (20%) CT. Some CT had vertical, full length periodontal destruction between the infected apex and the gingival margin that were believed to be the route of infection in four (19%) CT and dysplastic changes were believed to have caused one (2%) infections.
对41颗已拔除的、根尖感染的下颌颊牙（CT）进行检查，这些牙齿无明显感染原因，检查方法包括放射摄影、计算机轴向断层扫描以及脱钙和未脱钙组织学检查。在近期感染的CT中，部分牙髓仍存活，增殖性软组织和钙化组织变化局限于根尖。在感染更严重的CT中，有时会出现咬合面牙髓暴露（41颗CT中有34%出现这种情况），一些感染的牙髓腔充满坏死牙髓或食物，钙化根尖组织出现广泛的破坏性或增殖性变化。在24颗CT（59%）中未发现感染至根尖的物理途径，因此认为这些牙齿存在引菌感染。在8颗（20%）CT中发现涉及牙髓的骨折，包括临床牙冠与感染牙髓之间的裂纹骨折。部分CT在感染根尖与牙龈边缘之间存在垂直的全长牙周破坏，认为这是4颗（19%）CT的感染途径，发育异常变化被认为是1颗（2%）牙齿感染的原因。
