Resident, Department of Orthodontics, Section of Dentistry, Department of Surgery, Aga Khan University Hospital, Karachi, Pakistan.
Consultant orthodontist, assistant professor, and program coordinator of the orthodontics residency program, Section of Dentistry, Department of Surgery, Aga Khan University Hospital, Karachi, Pakistan.
Am J Orthod Dentofacial Orthop. 2014 Oct;146(4):437-41. doi: 10.1016/j.ajodo.2014.06.010.
The association of sella turcica bridging and various dental anomalies has been an area of interest for researchers. Based on the evidence of a common embryologic origin between sella turcica and the teeth, the objectives of this study were to measure the dimensions of sella turcica and to test whether an association exists between sella bridging and impacted canines.
Orthodontic records comprising standard-quality lateral cephalograms and dental panoramic radiographs were selected. Thirty-one patients with palatally impacted canines (20 female, 11 male; mean age, 18.4 ± 8.9 years) and 70 controls with erupted canines (35 male, 35 female; mean age, 17.1 ± 7.5 years) were included in the study. Comparison of sella dimensions between the patients and the controls was carried out by independent sample t tests, whereas the association of sella bridging with impacted canines was analyzed using the chi-square test.
The frequencies of complete and partial calcification of sella in the patients were 8 (25.8%) and 17 (54.8%), respectively, whereas those in the controls were 0 and 36 (51.4%), respectively. The frequency of sella bridging was significantly higher in subjects with canine impaction than in the controls (P <0.001). The sagittal interclinoidal distance was found to be significantly reduced in the patients (P = 0.028). According to the statistical analysis, age and sex do not influence the dimensions and calcification of sella turcica.
Sella bridging is frequently found in patients with impacted canines. Hence, sella bridging can complement other diagnostic parameters in confirming the status of canine impaction.
鞍结节桥接与各种牙齿异常的关联一直是研究人员感兴趣的领域。基于鞍结节和牙齿之间存在共同胚胎起源的证据，本研究的目的是测量鞍结节的尺寸，并检验鞍结节桥接与埋伏尖牙之间是否存在关联。
选择了包含标准质量侧位头颅侧位片和口腔全景片的正畸记录。研究纳入了 31 例上颌埋伏尖牙患者（20 名女性，11 名男性；平均年龄 18.4±8.9 岁）和 70 例埋伏尖牙已萌出的对照者（35 名男性，35 名女性；平均年龄 17.1±7.5 岁）。通过独立样本 t 检验比较患者和对照组的鞍结节尺寸，使用卡方检验分析鞍结节桥接与埋伏尖牙的关联。
患者中完全和部分鞍结节钙化的频率分别为 8（25.8%）和 17（54.8%），而对照组分别为 0 和 36（51.4%）。埋伏尖牙患者中鞍结节桥接的频率明显高于对照组（P<0.001）。患者的蝶鞍横径明显减小（P=0.028）。根据统计分析，年龄和性别不影响鞍结节的尺寸和钙化。
埋伏尖牙患者中常发现鞍结节桥接。因此，鞍结节桥接可以补充其他诊断参数，以确认埋伏尖牙的状态。
