Mensah T M S, Garvald H, Grindefjord M, Robertson A, Koch G, Ullbro C
Clinic of Paediatric Dentistry, Public Dental Service, Hagagatan 6, 652 20, Karlstad, Värmland, Sweden,
Eur Arch Paediatr Dent. 2015 Jun;16(3):291-6. doi: 10.1007/s40368-014-0162-8. Epub 2015 Jan 17.
Although a large number of mesiodentes are left in situ, only a few are found in radiographs from epidemiological studies of adult populations. This leads to the development of a hypothesis that mesiodentes may be resorbed and disappear over time. The aim of this study was to radiographically investigate the frequency of resorptions and pathologies in relation to mesiodentes left in situ.
The study population consisted of 44 individuals, with 49 mesiodentes left in situ at an early age. The individuals were 18-38 years old when re-examined. The inclusion criteria were that the mesiodentes had been diagnosed in childhood and left in situ, and that each individual was over 18 years of age at the time of re-examination. Either digital or analogue intraoral radiographs were used at the re-examination and compared with earlier analogue radiographs.
Forty-one per cent of the impacted mesiodentes showed resorptions-from limited to nearly complete resorption. No pathologies in connection to the mesiodentes were found.
About half of the mesiodentes examined displayed resorption. No pathologies caused by the mesiodentes were recorded.
尽管大量额外牙留在原位，但在成人群体的流行病学研究的X光片中仅发现少数额外牙。这导致一种假说的形成，即额外牙可能会随着时间的推移被吸收并消失。本研究的目的是通过X光片调查与留在原位的额外牙相关的吸收和病变的频率。
研究人群由44名个体组成，他们在幼年时共有49颗额外牙留在原位。重新检查时，这些个体的年龄在18至38岁之间。纳入标准是额外牙在儿童期被诊断出并留在原位，且每个个体在重新检查时年龄超过18岁。重新检查时使用了数字或模拟口腔内X光片，并与早期的模拟X光片进行比较。
41%的埋伏额外牙出现了吸收——从有限吸收到几乎完全吸收。未发现与额外牙相关的病变。
约一半接受检查的额外牙显示有吸收。未记录到由额外牙引起的病变。
