Angle Orthod. 2022 Jan 1;92(1):18-26. doi: 10.2319/030121-164.1.
To compare the normal eruption pattern and angulation in impacted maxillary canines using panoramic radiographs to predict maxillary canine impaction.
Patients aged 6 to 15 years were classified into the normal eruption group (n = 229) and the impaction group (n = 191). At least two panoramic radiographs were taken in the normal eruption group during the eruption process of the maxillary canine. The growth pattern of the maxillary canine was analyzed using an XY coordinate system, with the tip of the maxillary lateral incisor as the origin and the tooth's long axis as the Y-axis and measurement of the relative position of the crown tip and angulation of the maxillary canine.
The crown tips of normally erupted maxillary canines were intensively distributed along the distal surface of the maxillary lateral incisor, while those of impacted canines were widely distributed. The angulations of the normally erupted canines increased as eruption increased along the lateral incisor and then decreased at the cervical point of the lateral incisor. The angulations of the impacted canines were scattered, with no uniform pattern.
While using the normal eruption path of the maxillary canine and the pattern of change in angulation based on the distal surface of the maxillary lateral incisor, early intervention or regular follow-up is needed to prevent maxillary canine impaction.
通过比较使用全景片评估上颌尖牙正常萌出形态和角度，预测上颌尖牙阻生。
选择 6-15 岁患者，分为正常萌出组（n=229）和阻生组（n=191）。正常萌出组中，至少有 2 张全景片在尖牙萌出过程中拍摄。使用 X、Y 坐标系统分析上颌尖牙的生长形态，以侧切牙切端为原点，牙长轴为 Y 轴，测量牙冠切端的相对位置和上颌尖牙的角度。
正常萌出的上颌尖牙牙冠切端集中分布于侧切牙远中面，而阻生的上颌尖牙牙冠切端广泛分布。随着侧切牙萌出，正常萌出的上颌尖牙角度逐渐增加，然后在侧切牙切端处减小。阻生的上颌尖牙角度分散，无统一模式。
利用上颌尖牙正常萌出路径和基于侧切牙远中面的角度变化模式，早期干预或定期随访，以预防上颌尖牙阻生。
