Mejía-Milian Mabel, Arriola-Guillén Luis-Ernesto, Aliaga-Del Castillo Aron, Rodríguez-Cárdenas Yalil-Augusto, Ruíz-Mora Gustavo-Armando
Division of Oral and Maxillofacial Radiology, School of Dentistry, Universidad Científica del Sur, Lima, Perú.
Division of Orthodontics and Division of Oral and Maxillofacial Radiology, School of Dentistry, Universidad Científica del Sur, Lima, Perú.
J Clin Exp Dent. 2022 Oct 1;14(10):e791-e802. doi: 10.4317/jced.59808. eCollection 2022 Oct.
To three-dimensionally evaluate the characteristics of mandibular canine impaction with the morphometry of the roots of the lower incisors.
Cone-beam computed tomography (CBCT) scans of 35 individuals (18 males and 17 females) with a mean age of 14.37± 10.26 years were evaluated. Forty-three impacted mandibular canines (IMbC) were evaluated. Their location, sector and level of impaction were determined. Likewise, the distances of the canines to the occlusal plane, the angulations with respect to the midline and adjacent lateral incisors, the length of the impacted canines, and of the lower incisors were measured. Finally, the presence of incisor root resorption was determined. Chi-square and Kruskal Wallis tests were employed (<0.05).
The buccal position of the IMbCs was the most predominant (65.1%), and the location below the apical middle third of the lower incisor root was the most frequent (32.6%). No statistical significance was found between root resorption and location, level and impaction sector. Only mild root resorption and impaction sector 5 was significant (66.70%; <0.001). The proximity of the follicle and crown of the IMbC did not affect the root structure of the lower incisors. 72.1% and 52.2% of mandibular canines did not present contact of the impacted canine or its follicle with the adjacent tooth respectively. Root lengths were similar in the different types of impactions (>0.05).
IMbCs are mostly positioned buccally and below the apical middle third of the root of the lower incisors. Likewise, the proximity of their follicles and crowns does not seem to affect the root structure of the lower incisors, producing minimal and infrequent root resorption. Mandibular canine impaction, incisor root morphometry, cone-beam CT.
通过下颌切牙牙根形态测量对下颌尖牙阻生特征进行三维评估。
对35名平均年龄为14.37±10.26岁的个体（18名男性和17名女性）的锥形束计算机断层扫描（CBCT）图像进行评估。共评估了43颗下颌阻生尖牙（IMbC）。确定其位置、阻生区域和水平。同样，测量尖牙到咬合平面的距离、相对于中线和相邻侧切牙的角度、阻生尖牙和下颌切牙的长度。最后，确定切牙牙根吸收的情况。采用卡方检验和克鲁斯卡尔 - 沃利斯检验（<0.05）。
IMbC的颊侧位置最为常见（65.1%），位于下颌切牙牙根根尖中三分之一以下的位置最为频繁（32.6%）。牙根吸收与位置、水平和阻生区域之间未发现统计学意义。仅轻度牙根吸收与阻生区域5具有显著相关性（66.70%；<0.001）。IMbC的滤泡和牙冠的接近程度不影响下颌切牙的牙根结构。分别有72.1%和52.2%的下颌尖牙阻生时，阻生尖牙或其滤泡与相邻牙齿无接触。不同类型阻生情况下牙根长度相似（>0.05）。
IMbC大多位于颊侧且在下颌切牙牙根根尖中三分之一以下。同样，其滤泡和牙冠的接近程度似乎不影响下颌切牙的牙根结构，产生的牙根吸收最小且不常见。下颌尖牙阻生、切牙牙根形态测量、锥形束CT。
