Nascimento Eduarda Helena Leandro, Oenning Anne Caroline Costa, Rocha Nadaes Mariana, Ambrosano Gláucia Maria Bovi, Haiter-Neto Francisco, Freitas Deborah Queiroz
Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, Sao Paulo, Brazil.
Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, Sao Paulo, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2017 Mar;123(3):401-407. doi: 10.1016/j.oooo.2016.12.001. Epub 2016 Dec 18.
To evaluate the relation of juxta-apical radiolucency (JAR) to the mandibular canal and cortical plates on cone beam computed tomography images, as well as to assess whether the presence of JAR is related to the position of the mandibular canal.
Forty-seven JAR cases were evaluated by cone beam computed tomography. JAR position and its relationship to the mandibular canal and cortical plates were investigated. The position of the mandibular canal was recorded and compared with a control group. Descriptive analyses and χ tests were performed.
A significant association was established between JAR and the position of the mandibular canal (P = .0193), which was positioned lingually in 59.6% of JAR cases. In most cases, JAR was located distal to the tooth (66%) and in contact with the mandibular canal, either with (53.2%) or without (40.4%) preservation of the cortical border of the canal. In 22 cases (46.8%), thinning of cortical plates was observed, but no statistical differences were found between buccal and lingual sides (P = .5728).
The mandibular canal is located lingually in the third molar region in most JAR cases. JAR is located distal to the tooth and is generally in contact with the mandibular canal. These relations may increase the risk of nerve injury during surgical removal of third molars.
在锥形束计算机断层扫描图像上评估根尖周透射区（JAR）与下颌管及皮质骨板的关系，并评估JAR的存在是否与下颌管位置有关。
通过锥形束计算机断层扫描对47例JAR病例进行评估。研究JAR的位置及其与下颌管和皮质骨板的关系。记录下颌管的位置并与对照组进行比较。进行描述性分析和χ检验。
JAR与下颌管位置之间建立了显著关联（P = 0.0193），在59.6%的JAR病例中，下颌管位于舌侧。在大多数情况下，JAR位于牙齿远中（66%）并与下颌管接触，其中53.2%的病例下颌管皮质边界完整，40.4%的病例下颌管皮质边界不完整。在22例（46.8%）病例中观察到皮质骨板变薄，但颊侧和舌侧之间未发现统计学差异（P = 0.5728）。
在大多数JAR病例中，下颌管位于第三磨牙区域的舌侧。JAR位于牙齿远中，通常与下颌管接触。这些关系可能会增加第三磨牙手术拔除过程中神经损伤的风险。
