Salemi Fatemeh, Foroozandeh Maryam, Mirzaee Maryam, Farhadian Maryam, Makateb Paria, Mostafapour Marjan
Department of Oral and Maxillofacial Radiology, Dental School, Hamadan University of Medical Sciences, Hamadan, Iran.
Department of Oral and Maxillofacial Radiology, Dental School, Guilan University of Medical Sciences, Rasht, Iran.
Contemp Clin Dent. 2021 Apr-Jun;12(2):128-132. doi: 10.4103/ccd.ccd_156_20. Epub 2021 Jun 14.
Mandibular para-radicular third molar radiolucencies (MPRs) may be mistaken for pathological lesions, leading to misdiagnosis and mistreatment. This study sought to assess the appearance of MPRs on cone-beam computed tomography (CBCT).
This was a descriptive, cross-sectional study.
This study evaluated 770 CBCT of patients presenting to the dental school of Hamadan University of Medical Sciences. Demographic information, unilateral or bilateral presence, shape and prevalence of MPRs observed on axial and sagittal sections, their density, thinning of cortical margin, internal trabeculation, bony expansion, and mean height and width of MPRs were all evaluated.
Data were analyzed using SPSS version 22.0 and descriptive statistics. Chi-square test was used.
Seventy (9.1%) patients had a total of 82 MPRs, including 51 (72.86%) females. The prevalence of MPRs in females was more than males ( = 0.011). The majority of MPRs were unilateral 58 (70.73%), mostly round in shape 48 (58.54%), and were mostly associated with third molars with distoangular impaction 47 (57.31%); this difference was statistically significant ( < 0.001). Furthermore, in 47 (57.32%) patients, MPRs had less density than the surrounding bone. MPRs were not associated with expansion or root resorption in any patient.
Differentiation of MPRs from the pathological lesions is important to make a decision about further imaging or referral for surgical treatment. MPRs are often considered normal since they do not cause root resorption or bone expansion and do not affect the lamina dura. MPRs are more commonly found adjacent to third molars with distoangular impaction.
下颌根旁第三磨牙透射影（MPRs）可能被误诊为病理性病变，从而导致误诊和误治。本研究旨在评估锥形束计算机断层扫描（CBCT）上MPRs的表现。
这是一项描述性横断面研究。
本研究评估了770例就诊于哈马丹医科大学牙科学院患者的CBCT。对人口统计学信息、MPRs的单侧或双侧存在情况、在轴向和矢状面上观察到的形状和患病率、其密度、皮质边缘变薄、内部小梁结构、骨质膨胀以及MPRs的平均高度和宽度进行了评估。
使用SPSS 22.0版软件进行数据分析并采用描述性统计。使用卡方检验。
70例（9.1%）患者共有82个MPRs，其中女性51例（72.86%）。女性MPRs的患病率高于男性（P = 0.011）。大多数MPRs为单侧58个（70.73%），大多呈圆形48个（58.54%），且大多与远中倾斜阻生的第三磨牙相关47个（57.31%）；这种差异具有统计学意义（P < 0.001）。此外，47例（57.32%）患者的MPRs密度低于周围骨质。在任何患者中，MPRs均与骨质膨胀或牙根吸收无关。
将MPRs与病理性病变区分开来对于决定是否进一步进行影像学检查或转诊进行手术治疗很重要。MPRs通常被认为是正常的，因为它们不会导致牙根吸收或骨质膨胀，也不影响硬骨板。MPRs更常见于与远中倾斜阻生第三磨牙相邻处。
