Ghaffar Farhana, Sukhia Rashna Hoshang, Fida Mubassar
Ekangala Clinic, Gauteng, South Africa.
The Aga Khan University Hospital, Karachi, Pakistan.
Int Orthod. 2019 Sep;17(3):554-561. doi: 10.1016/j.ortho.2019.06.016. Epub 2019 Jul 19.
The aim of this study was to determine the association between transverse maxillary discrepancy and occurrence of potentially impacted maxillary canines in mixed dentition patients.
This cross-sectional analytical study was conducted on 85 Pakistani subjects (32 males and 53 females) aged between 8 to 13 years, having good quality orthopantomographs and dental casts. Maxillary transverse discrepancy was assessed by subtracting the mandibular intermolar width from the maxillary intermolar width on dental cast. Maxillary lateral incisors and canines were traced from orthopantomographs, and canines were placed into sector classification. Chi-square test was used to determine the difference in the occurrence of potentially impacted maxillary canines between patients with maxillary transverse discrepancy and patients without maxillary transverse discrepancy.
There was no significant difference seen in the occurrence of impacted maxillary canines in patients with and without maxillary transverse discrepancy in mixed dentition patients.
Patients with maxillary transverse discrepancy may not be at a higher risk of palatal canine impaction. Radiological presence of canine in sector II, III and IV, pose a higher risk of canine impaction.
本研究旨在确定混合牙列期患者上颌横向差异与上颌潜在阻生尖牙发生之间的关联。
本横断面分析研究针对85名年龄在8至13岁之间的巴基斯坦受试者(32名男性和53名女性)进行,这些受试者拥有质量良好的曲面断层片和牙模。通过从牙模上的上颌磨牙间宽度减去下颌磨牙间宽度来评估上颌横向差异。从曲面断层片上追踪上颌侧切牙和尖牙,并将尖牙进行扇形分类。采用卡方检验来确定上颌横向差异患者与无上颌横向差异患者中潜在上颌阻生尖牙发生率的差异。
混合牙列期患者中,有上颌横向差异和无上颌横向差异的患者在上颌阻生尖牙的发生率上没有显著差异。
上颌横向差异的患者发生腭侧尖牙阻生的风险可能并不更高。位于Ⅱ、Ⅲ和Ⅳ区的尖牙在影像学上存在时,发生尖牙阻生的风险更高。