Nascimento Eduarda Helena Leandro, Oenning Anne Caroline Costa, Freire Bernardo Barbosa, Gaêta-Araujo Hugo, Haiter-Neto Francisco, Freitas Deborah Queiroz
Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), Sao Paulo, Brazil.
Dentomaxillofac Radiol. 2018 Jan;47(1):20170198. doi: 10.1259/dmfr.20170198. Epub 2017 Nov 1.
To compare the performance of panoramic radiography (PAN) and cone beam CT (CBCT) in the detection of juxta-apical radiolucency (JAR), as well as to investigate, in CBCT images, if there are factors associated with the detection of JAR on PAN.
Two oral radiologists assessed the presence of JAR in PAN and CBCT images of 175 individuals (308 mandibular third molars). The cortical plates involvement and the JAR size and location were assessed on CBCT to evaluate if these factors were related to JAR detection on PAN. McNemar's test and multiple logistic regression were performed.
PAN and CBCT differed significantly in the detection of JAR (p = 0.001). On PAN, JAR was identified on 24% of the patients while on CBCT its detection increased to 32.6%. JAR was detected only on CBCT and only on PAN in 26 and 7 cases, respectively. Distal/mesial surfaces of dental roots were where JAR was mostly located (84.5%), cortical thinning was found in 59.2% of cases and the mean (SD) of JAR size was 5.03 (±1.8) mm. However, these factors were not associated with JAR detection on PAN (p > 0.05). On the other hand, the location of the cortical involvement (if buccal or lingual) was associated with JAR detection on PAN, which was more detectable when the thinning was on buccal cortical.
Juxta-apical radiolucency is more often detected on CBCT than on PAN. JAR detection on PAN was improved when it was related to the buccal cortical plate of the mandible.
比较全景X线片（PAN）和锥形束CT（CBCT）在检测根尖周透明区（JAR）方面的性能，并在CBCT图像中研究是否存在与PAN上JAR检测相关的因素。
两名口腔放射科医生评估了175名个体（308颗下颌第三磨牙）的PAN和CBCT图像中JAR的存在情况。在CBCT上评估皮质板受累情况以及JAR的大小和位置，以评估这些因素是否与PAN上的JAR检测相关。进行了McNemar检验和多元逻辑回归分析。
PAN和CBCT在JAR检测方面存在显著差异（p = 0.001）。在PAN上，24%的患者被检测出JAR，而在CBCT上其检测率提高到32.6%。分别有26例和7例JAR仅在CBCT上被检测到，仅在PAN上被检测到。牙根的远中/近中面是JAR最常出现的部位（84.5%），59.2%的病例发现皮质变薄，JAR大小的平均值（标准差）为5.03（±1.8）mm。然而，这些因素与PAN上的JAR检测无关（p > 0.05）。另一方面，皮质受累的位置（颊侧或舌侧）与PAN上的JAR检测相关，当颊侧皮质变薄时更易检测到。
CBCT比PAN更常检测到根尖周透明区。当JAR与下颌骨颊侧皮质板相关时，PAN上的检测效果会更好。
