Tsubone Hanako, Onishi Tomoyuki, Hayashibara Tetsuyuki, Sobue Shizuo, Ooshima Takashi
Department of Pedodontics, Osaka University Graduate School of Dentistry, Osaka, Japan.
J Oral Pathol Med. 2002 Apr;31(4):239-41. doi: 10.1034/j.1600-0714.2002.310408.x.
A Japanese girl was referred to Osaka University Dental Hospital for examination of a tooth-like structure that had erupted following spontaneous exfoliation of a natal tooth in the lower left primary central incisor region. The structure had erupted at 6 months of age, and radiographic and clinical examination showed composition of pulp and dentin, but no enamel. On histological examination, the majority of the dentin area had a tubular dentin-like appearance, while the outer area of the root appeared to be composed of an osteodentin-like substance. Most of the dentin was covered by cementum. These findings suggest that the structure had originated from a developing remnant of the extracted natal tooth, which must have remained in the gingival tissues. We termed this calcified structure a residual natal tooth.
一名日本女孩因左下乳中切牙区一颗出生牙自然脱落之后萌出的牙样结构，被转诊至大阪大学牙科学院医院进行检查。该结构在6个月大时萌出，影像学和临床检查显示其由牙髓和牙本质组成，但无釉质。组织学检查发现，大部分牙本质区域呈现出管状牙本质样外观，而牙根外部区域似乎由类骨牙本质物质组成。大部分牙本质被牙骨质覆盖。这些发现表明，该结构起源于已拔除的出生牙的发育残余物，这些残余物必定残留在牙龈组织中。我们将这种钙化结构称为残留出生牙。
