van den Enden M S D, Dixon P M
Royal (Dick) School of Veterinary Studies, University of Edinburgh, Department of Clinical Science, University of Edinburgh, Midlothian EH25 9RG, UK.
Vet J. 2008 Dec;178(3):364-71. doi: 10.1016/j.tvjl.2008.09.026. Epub 2008 Nov 17.
Examination of 110 cheek teeth (CT) that were clinically extracted (between 2004 and 2008) because of apical infection (n=79; mean dental age 3.5 years) or idiopathic CT fractures (n=31; median dental age 8.5 years), including examinations of transverse and longitudinal sections, showed the apical infections to be mainly (68%) due to anachoresis, with the residual cases caused by periodontal spread, infundibular caries spread, fissure fractures and dysplasia. The idiopathic fracture patterns were similar to previously described patterns. Occlusal pulpar exposure was found in 32% of apically infected CT, including multiple pulps in 27% and a single pulp in 5%. However, 10% of apically infected CT had changes to the occlusal secondary dentine, termed occlusal pitting, but did not have exposure of the underlying pulp. Multiple pulpar exposures occurred in some CT with apical infections, and the combination of pulp involvement reflects the anatomical relationships of these pulps. A higher proportion (42%) of CT extracted because idiopathic fractures had pulpar exposure (26% multiple, 16% single pulps), especially with midline sagittal maxillary and miscellaneous pattern mandibular CT fractures, but only (3%) had occlusal pitting.
对2004年至2008年间因根尖感染（n = 79；平均牙龄3.5岁）或特发性牙冠骨折（n = 31；中位牙龄8.5岁）而临床拔除的110颗后牙（CT）进行检查，包括横切面和纵切面检查，结果显示根尖感染主要（68%）是由于菌栓形成，其余病例由牙周扩散、漏斗状龋扩散、裂隙骨折和发育异常引起。特发性骨折模式与先前描述的模式相似。在32%的根尖感染CT中发现咬合面牙髓暴露，其中27%为多个牙髓暴露，5%为单个牙髓暴露。然而，10%的根尖感染CT有咬合面继发性牙本质改变，称为咬合面凹陷，但未暴露下方牙髓。一些根尖感染的CT出现多个牙髓暴露，牙髓受累的组合反映了这些牙髓的解剖关系。因特发性骨折而拔除的CT中，牙髓暴露的比例更高（42%）（26%为多个牙髓暴露，16%为单个牙髓暴露），尤其是上颌中线矢状骨折和下颌杂类模式骨折，但只有（3%）有咬合面凹陷。
