Pacifici L, DE Angelis F, Orefici A, Cielo A, Tatullo M
Department of Oral and Maxillofacial Science, "Sapienza" University of Rome, Rome, Italy.
Private Practice, Rome, Italy.
Oral Implantol (Rome). 2017 Feb 14;9(Suppl 1/2016 to N 4/2016):1-9. doi: 10.11138/orl/2016.9.1S.001. eCollection 2016 Jan-Mar.
Permanent maxillary canines are the second most frequently impacted teeth and the prevalence of this clinical condition is estimated to be 1-2% in the general population. The diagnosis of maxillary canine impaction should be based on both clinical and radiographic examinations. The aim of this study was to evaluate the presence of a correlation between the facial biotype and the inclination of the upper cusp axis. A correlation between the total radicular length of the lateral incisors was also evaluated, by comparing the side of impaction with the healthy side. Twenty three patients with a diagnosis of unilateral upper cusp impaction were recruited. For each patient, dental casts and radiographic material (panoramic radiographs and lateral cephalograms) were examined. Statistical analyses were done with Spearman's rank correlation coefficient or Spearman's rho (ρ). X-ray examinations demonstrated that canine impaction was associated to other dental anomalies (32% of the sample). The mean α angle measurements were 22.9° ± 4.1°, and mean values of the β angle were 34.7°± 4.0°. The mean distance "d" value was 14.6 mm ± 1.2 mm. The mean values of the angle between the upper cusp axis and the perpendicular-to-Fh plane were 20.8° ± 2.6°. Among the 23 subjects recruited, 5 showed values included in the range 25°-45° and 1 an inclination > 45°. The results obtained in the present study demonstrate a significant inverse correlation between the MM angle and the inclination of the upper cusp axis to the perpendicular-to-Fh plane.
上颌恒尖牙是第二常见的阻生牙，据估计，这种临床情况在普通人群中的患病率为1%-2%。上颌尖牙阻生的诊断应基于临床检查和影像学检查。本研究的目的是评估面部生物型与上尖牙轴倾斜度之间是否存在相关性。通过比较阻生侧与健康侧，还评估了侧切牙总牙根长度之间的相关性。招募了23例诊断为单侧上尖牙阻生的患者。对每位患者的石膏模型和影像学资料（全景片和头颅侧位片）进行检查。采用Spearman等级相关系数或Spearman秩相关系数（ρ）进行统计分析。X线检查表明，尖牙阻生与其他牙齿异常有关（样本的32%）。平均α角测量值为22.9°±4.1°，平均β角测量值为34.7°±4.0°。平均距离“d”值为14.6 mm±1.2 mm。上尖牙轴与垂直于Fh平面之间的平均角度值为20.8°±2.6°。在招募的23名受试者中，5名的测量值在25°-45°范围内，1名的倾斜度>45°。本研究获得的结果表明，MM角与上尖牙轴相对于垂直于Fh平面的倾斜度之间存在显著的负相关。
