Sedgley C M, Messer H
Royal Dental Hospital, School of Dental Science, University of Melbourne, Australia.
Endod Dent Traumatol. 1993 Jun;9(3):120-3. doi: 10.1111/j.1600-9657.1993.tb00263.x.
A case is reported of a 15 mm paper point found in the periapical area of a maxillary right central incisor during endodontic surgery for an unresolved periapical radiolucency. The paper point had been present for between five and nine years. Histopathological examination showed the presence of chronically inflamed fibrous connective tissue with a number of foreign body giant cells and focal collections of chronic inflammatory cells. SEM comparison of the specimen with a similarly treated fresh paper point showed no indication of degradation of the paper point by host defense cells.
据报道，在对上颌右中切牙根尖周未愈的透射区进行根管外科手术时，在根尖周区域发现了一个15毫米的纸尖。该纸尖已存在五至九年。组织病理学检查显示存在慢性炎症的纤维结缔组织，伴有一些异物巨细胞和慢性炎症细胞的局灶性聚集。将该标本与经类似处理的新鲜纸尖进行扫描电子显微镜比较，结果显示宿主防御细胞未对纸尖造成降解。
