Sajnani Anand, King Nigel
Paediatric Dentistry, Terna Dental College and Hospital, Navi Mumbai, India.
J Orofac Orthop. 2012 Sep;73(5):359-64. doi: 10.1007/s00056-012-0106-z. Epub 2012 Sep 6.
It is generally perceived that patients with palatally impacted canines experience a delay in dental development, while patients with buccally impacted canines do not. Nevertheless, there is little scientific data on the subject, and no data at all on Chinese populations. The objectives of this study were, thus, to determine whether patients with impacted canines would demonstrate delayed dental development.
Retrospective radiographic study.
Dental hospital.
Our study enrolled southern Chinese children and adolescents with unilaterally impacted maxillary canines. A total of 281 panoramic radiographs were available to assess dental age. Demirjian's method was utilized to determine the dental age.
The discrepancy between dental and chronologic ages was then calculated, revealing a mean difference of 0.4 years (± 0.2 years), indicating advanced dental development. The cumulative difference between dental age and chronologic age showed that 42.2% of the patients with a buccally impacted canine and 30% with a palatally impacted canine experienced a delay in dental development, or coincided with their chronologic age.
Less than half of the patients with both buccally and palatally impacted canines showed delayed dental development. Their dental maturity was on average slightly but clinically insignificantly advanced.
一般认为，腭侧阻生尖牙患者的牙齿发育会延迟，而颊侧阻生尖牙患者则不会。然而，关于这一主题的科学数据很少，关于中国人群的数据则完全没有。因此，本研究的目的是确定阻生尖牙患者是否会出现牙齿发育延迟。
回顾性影像学研究。
牙科医院。
我们的研究纳入了中国南方单侧上颌尖牙阻生的儿童和青少年。共有281张全景X线片可用于评估牙龄。采用德米尔坚方法确定牙龄。
然后计算出牙龄与实际年龄之间的差异，平均差异为0.4岁（±0.2岁），表明牙齿发育提前。牙龄与实际年龄的累积差异表明，42.2%的颊侧阻生尖牙患者和30%的腭侧阻生尖牙患者牙齿发育延迟，或与实际年龄相符。
颊侧和腭侧阻生尖牙患者中不到一半出现牙齿发育延迟。他们的牙齿成熟度平均略有提前，但在临床上无显著差异。
