Dental anomalies in an orthodontic patient population with maxillary lateral incisor agenesis

ABSTRACT Introduction: The purpose of this study was to evaluate the prevalence of dental anomalies in a subpopulation of orthodontic patients with agenesis of maxillary lateral incisors (MLI). Methods: The material of the present study included the records of the 1964 orthodontic patients. Panoramic radiographs and dental casts were used to analyze other associated eight dental anomalies, including agenesis of other teeth, dens invaginatus, dens evaginatus, peg shaped MLI, taurodontism, pulp stone, root dilaceration and maxillary canine impaction. Results: Out of the 1964 patients examined, 90 were found to have agenesis of MLI, representing a prevalence of 4.6%. The most commonly found associated-anomalies were agenesis of other teeth (23.3%), peg-shaped MLIs (15.6%), taurodontism (42.2%), and dilacerated teeth (18.9%). Conclusion: Permanent tooth agenesis, taurodontism, peg-shaped maxillary lateral incisor, and root dilacerations are frequently associated with maxillary lateral incisor agenesis.

摘要
引言：本研究旨在评估上颌侧切牙（maxillary lateral incisors, MLI）先天缺失的正畸患者亚群中牙齿发育异常的患病率。
方法：本研究的研究资料涵盖1964例正畸患者的诊疗记录。采用曲面体层放射线片与牙科模型，对8种相关牙齿发育异常进行分析，包括其他牙齿先天缺失、牙内陷（dens invaginatus）、牙外突（dens evaginatus）、钉形上颌侧切牙、牛牙症（taurodontism）、牙髓石、牙根弯曲以及上颌尖牙阻生。
结果：在1964例受检患者中，共90例被检出上颌侧切牙先天缺失，患病率为4.6%。最常见的伴发发育异常依次为其他牙齿先天缺失（23.3%）、钉形上颌侧切牙（15.6%）、牛牙症（42.2%）以及牙根弯曲（18.9%）。
结论：恒牙先天缺失、牛牙症、钉形上颌侧切牙以及牙根弯曲常与上颌侧切牙先天缺失伴发。