Lima Djalma Maciel de, Estrela Cyntia Rodrigues de Araújo, Bernardes Cristiane Martins Rodrigues, Estrela Lucas Rodrigues de Araújo, Bueno Mike Reis, Estrela Carlos
Department of Oral Biology, School of Dentistry, Evangelical University of Goiás, Anápolis 75083-515, Brazil.
Center for Radiology and Orofacial Images, Diagnostic Imaging Center, Cuiabá 78043-272, Brazil.
Diagnostics (Basel). 2024 Jan 25;14(3):260. doi: 10.3390/diagnostics14030260.
(1) Background: This study assessed the spatial position and anatomical features associated with impacted third molars through a map-reading strategy employing cone-beam computed tomography (CBCT). (2) Methods: The positioning of impacted third molars on CBCT was assessed using Winter's and Pell and Gregory's classifications. External root resorption in mandibular second molars was categorized according to Herman's classification. Additionally, the relationship between the mandibular third molar root apex and the mandibular canal was examined. Comparative statistical analysis was conducted using Fisher's exact test, with a significance level considered as 5%. (3) Results: The results indicated that, based on Winter's classification, 48.06 % of impacted teeth were positioned mesioangularly. Employing Pell and Gregory's classification, 43.22% of the impacted molars fell into positions B and C, with 54.2% classified as Class II. A notable 69.7% of teeth exhibited no contact between the root apex and the mandibular canal, and external root resorption in the distal aspect of the second molar was absent in 88.7% of cases. (4) Conclusions: Utilizing the map-reading strategy with CBCT scans to assess the anatomical positions and characteristics of impacted third molars enhances professional confidence and sets a standard for quality and safety in the surgical procedure for patients.
(1) 背景：本研究通过采用锥形束计算机断层扫描（CBCT）的读片策略，评估了与阻生第三磨牙相关的空间位置和解剖特征。(2) 方法：使用温特分类法和佩尔与格雷戈里分类法评估CBCT上阻生第三磨牙的位置。根据赫尔曼分类法对下颌第二磨牙的牙根外吸收进行分类。此外，还检查了下颌第三磨牙根尖与下颌管之间的关系。采用费舍尔精确检验进行比较统计分析，显著性水平设定为5%。(3) 结果：结果表明，根据温特分类法，48.06%的阻生牙呈近中倾斜位。采用佩尔与格雷戈里分类法时，43.22%的阻生磨牙位于B类和C类位置，54.2%被归类为II类。值得注意的是，69.7%的牙齿根尖与下颌管无接触，88.7%的病例中第二磨牙远中面无牙根外吸收。(4) 结论：利用CBCT扫描的读片策略评估阻生第三磨牙的解剖位置和特征，可增强专业信心，并为患者手术的质量和安全设定标准。
