title: Detection accuracy of proximal caries by phosphor plate and cone-beam computerized tomography images scanned with different resolutions.
abstract: This study was carried out to assess whether the spatial resolution has an impact on the detection accuracy of proximal caries in flat panel CBCT (cone beam computerized tomography) images and if the detection accuracy can be improved by flat panel CBCT images scanned with high spatial resolution when compared to digital intraoral images. The CBCT test images of 45 non-restored human permanent teeth were respectively scanned with the ProMax 3D and the DCT Pro scanners at different resolutions. Digital images were obtained with a phosphor plate imaging system Digora Optime. Eight observers evaluated all the test images for carious lesion within the 90 proximal surfaces. With the histological examination serving as the reference standard, observer performances were evaluated by receiver operating characteristic (ROC) curves. The areas under the ROC curves were analyzed with two-way analysis of variance. No significant differences were found among the CBCT images and between CBCT and digital images when only proximal enamel caries was detected (p = 0.989). With respect to the detection of proximal dentinal caries, significant difference was found between CBCT and digital images (p < 0.001) but not among CBCT images. The spatial resolution did not have an impact on the detection accuracy of proximal caries in flat panel CBCT images. The flat panel CBCT images scanned with high spatial resolution did not improve the detection accuracy of proximal enamel caries compared to digital intraoral images. CBCT images scanned with high spatial resolutions could not be used for proximal caries detection.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Peking University School and Hospital of Stomatology, #22 Zhongguancun Nandajie, Hai Dian District, 100081 Beijing, China.
authors.forename: Jun-Ge
authors.initials: JG
authors.lastname: Cheng
authors.forename: Zhi-Ling
authors.initials: ZL
authors.lastname: Zhang
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Wang
authors.forename: Zu-Yan
authors.initials: ZY
authors.lastname: Zhang
authors.forename: Xu-Chen
authors.initials: XC
authors.lastname: Ma
authors.forename: Gang
authors.initials: G
authors.lastname: Li
mesh_terms: D019540:Area Under Curve; D054893:Cone-Beam Computed Tomography / Q000295:instrumentation / Q000592:standards*; D003731:Dental Caries / Q000000981:diagnostic imaging* / Q000473:pathology; D003743:Dental Enamel / Q000000981:diagnostic imaging / Q000473:pathology; D003782:Dental Pulp / Q000000981:diagnostic imaging / Q000473:pathology; D003804:Dentin / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000592:standards*; D015588:Observer Variation; D012372:ROC Curve; D011856:Radiographic Image Enhancement / Q000592:standards; D019252:Radiography, Dental, Digital / Q000295:instrumentation / Q000592:standards*; D012015:Reference Standards; D012984:Software; D019237:Tooth Cervix / Q000000981:diagnostic imaging / Q000473:pathology; D019228:Tooth Crown / Q000000981:diagnostic imaging / Q000473:pathology; D017001:Tooth Demineralization / Q000000981:diagnostic imaging / Q000473:pathology; D014075:Tooth Discoloration / Q000000981:diagnostic imaging / Q000473:pathology; D014963:X-Ray Intensifying Screens / Q000592:standards