Mahaini Luai
Orthodontist, Department of Orthodontics, Damascus University, Damascus Syria Phone: 00963933712277, e-mail:
J Contemp Dent Pract. 2015 Nov 1;16(11):873-5. doi: 10.5005/jp-journals-10024-1774.
The aim of this study investigates mesiodistal crown size of the maxillary and mandibular incisors of patients with palatally impacted canines (PDC). Pretreatment dental casts of orthodontic patients with PDC of one or both maxillary canines (N: 33) were collected. This PDC sample was matched according to age and sex with pretreatment dental casts from unaffected orthodontic patients. For the PDC and matched control samples, maximum mesiodistal crown diameters were recorded for the four incisors on the right side only. The results showed that, on average, the mesiodistal crown diameters for the maxillary and mandibular incisors measured smaller in the PDC sample than in the control sample. These findings of statistically significant tooth-size reductions associated with PDC occurrence indicate a generalized pattern of reduced tooth size as a characteristic associated with the PDC anomaly. Further, the presence of generalized tooth-size reduction in cases with palatally displaced canines help explain why most orthodontic treatment plans for PDC patients are of the nonextraction type.
本研究旨在调查腭侧阻生尖牙（PDC）患者上颌和下颌切牙的近远中牙冠大小。收集了上颌一侧或双侧患有PDC的正畸患者的治疗前牙模（N = 33）。该PDC样本根据年龄和性别与未受影响的正畸患者的治疗前牙模进行匹配。对于PDC样本和匹配的对照样本，仅记录右侧四颗切牙的最大近远中牙冠直径。结果显示，平均而言，PDC样本中上颌和下颌切牙的近远中牙冠直径比对照样本中的小。这些与PDC发生相关的牙体大小统计学显著减小的发现表明，牙体大小减小是与PDC异常相关的一种普遍特征模式。此外，腭侧移位尖牙病例中普遍存在牙体大小减小有助于解释为什么大多数PDC患者的正畸治疗计划是非拔牙类型。
