Diagnostic performance of cone-beam computed tomography on detection of mechanically-created artificial secondary caries

PURPOSE: The aim of this study was to compare the diagnostic accuracy of cone-beam computed tomography (CBCT) images and bitewing images in detection of secondary caries. MATERIALS AND METHODS: One hundred and twenty proximal slots of Class II cavities were randomly prepared on human premolar and molar teeth, and restored with amalgam (n=60) and composite resin (n=60). Then, artificial secondary caries lesions were randomly created using round steel No. 4 bur. The teeth were radiographed with a conventional bitewing technique and two CBCT systems; Pax-500ECT and Promax 3D. All images were evaluated by five observers. The area under the receiver operating characteristic (ROC) curve (Az) was used to evaluate the diagnostic accuracy. Significant difference was tested using the Friedman test (p value<0.05). RESULTS: The mean Az values for bitewing, Pax-500ECT, and Promax 3D imaging systems were 0.882, 0.995, and 0.978, respectively. Significant differences were found between the two CBCT systems and film (p=0.007). For CBCT systems, the axial plane showed the greatest Az value. CONCLUSION: Based on the design of this study, CBCT images were better than bitewing radiographs in detection of secondary caries.

Radiographic Assessment of the Relationship between Lower Third Molar and the Inferior Alveolar Canal

            Many complications have been reported following the removal of lower third molars. Inferior alveolar nerve injury is one of those, and symptoms may range from temporary sensory alterations to paresthesia. To prevent this damage, pre-operative localization of the inferior alveolar nerve is necessary, and a radiographic examination is known as a modality to reveal how close of the inferior alveolar canal to the root of the lower third molar impaction. Various radiographic techniques have been applied for investigation. This article reviews radiographic features of the inferior alveolar canal and the use of panoramic and tomography in assessing the relationship between the inferior alveolar canal and the roots of third molars.  Prescription of radiographic techniques in clinical use is also discussed.Keywords: Paresthesia, Inferior alveolar canal, Tomography