Department of Orthodontics, Faculty of Dentistry, Van Yüzüncü Yıl University, Van, Turkey.
Department of Orthodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
Am J Orthod Dentofacial Orthop. 2021 May;159(5):627-634. doi: 10.1016/j.ajodo.2019.11.024.
This study aimed to evaluate and compare the bridging and dimensions of the sella turcica and calcification of the ponticulus posticus in subjects with different dental anomalies.
Pretreatment records of orthodontic patients with palatally impacted canines (n = 95), mandibular second premolar agenesis (n = 45), maxillary lateral incisor agenesis (n = 75), tooth transpositions (TT, n = 25), peg-shaped maxillary lateral incisors (n = 30), and third molar agenesis (TMA, n = 145) were analyzed and compared with the control group (CG) consisting of 145 subjects with skeletal Class I malocclusion and no dental anomalies. The length, diameter, and depth of the sella turcica were calculated for each patient. The degree of sella turcica bridging was scored as type I, II, and III, whereas the extent of ponticulus posticus was classified as Class I, II, and III.
Only decreases in the length and diameter of the sella turcica in subjects with TT were found to be statistically significant. Although type II bridging frequency was found to be significantly lower in subjects with mandibular second premolar agenesis, maxillary lateral incisor agenesis, TT, and TMA, type III bridging frequency was found to be significantly higher only in subjects with TMA. The decrease in Class I calcification frequencies and the increase in Class II calcification frequencies were found to be significant in subjects with palatally impacted canines, TT, and TMA compared with the CG. In addition, the presence of Class III calcification was found to be significantly more frequent in subjects with TMA than in the CG.
Although type II and type III bridging frequencies were found to be higher than in previous studies because of the higher type II bridging frequency in the CG, type II bridging frequency was found to be insignificant. Furthermore, an increased frequency of ponticulus posticus calcification was observed in subjects with palatally impacted canines, TT, and TMA.
本研究旨在评估和比较不同牙颌畸形患者蝶鞍桥接和鞍底尺寸以及后 Ponticulus 钙化情况。
分析了正畸治疗上颌埋伏尖牙（n=95）、下颌第二前磨牙缺失（n=45）、上颌侧切牙缺失（n=75）、牙齿异位（TT，n=25）、上颌侧切牙锥形牙（n=30）和第三磨牙缺失（TMA，n=145）患者的预处理记录，并与骨骼 I 类错颌且无牙颌畸形的对照组（CG，n=145）进行比较。对每位患者的蝶鞍长度、直径和深度进行计算。蝶鞍桥接程度评分分为 I 型、II 型和 III 型，后 Ponticulus 程度分类为 I 型、II 型和 III 型。
仅发现 TT 患者的蝶鞍长度和直径有统计学意义的减小。尽管下颌第二前磨牙缺失、上颌侧切牙缺失、TT 和 TMA 患者 II 型桥接频率显著降低，但仅 TMA 患者 III 型桥接频率显著升高。与 CG 相比，上颌埋伏尖牙、TT 和 TMA 患者 I 型钙化频率降低和 II 型钙化频率升高有显著差异。此外，与 CG 相比，TMA 患者 III 型钙化的发生率显著更高。
尽管由于 CG 中 II 型桥接频率较高，II 型和 III 型桥接频率高于以往研究，但 II 型桥接频率无统计学意义。此外，上颌埋伏尖牙、TT 和 TMA 患者的后 Ponticulus 钙化频率增加。
