Detection accuracy of condylar bony defects in Promax 3D cone beam CT images scanned with different protocols

Abstract

Objectives: To investigate and compare the detection accuracy of bony defects on the condylar surface of the temporomandibular joint (TMJ) in cone beam CT (CBCT) images scanned with standard and large view protocols on the same machine. Methods: 21 dry human skulls with 42 TMJs were scanned with the large view and standard view protocols of the CBCT scanner Promax 3D (Planmeca, Helsinki, Finland). Seven observers evaluated all the images for the presence or absence of defects on the surface of the condyle. Using the macroscopic examination of condylar defects as the gold standard, receiver operating characteristic (ROC) analysis was performed. Results: Macroscopic examination revealed that, of the 42 condyles, 18 were normal and 24 had a defect on the surface of the condyles. Areas under the ROC curves for the large view and the standard view group of CBCT images were 0.739 and 0.720, respectively, and no significant difference was found between the two groups of images (p 5 0.902). Neither the interobserver nor the intraobserver variability were significant. Conclusions: The two scanning protocols provided by the CBCT scanner Promax 3D were reliable and comparable with detection of condylar defects.

Temporomandibular joint diagnostics using CBCT

“…Since the large view protocol had an effective radiation dose of only about one-sixth of the standard view protocol, the large view protocol was recommended for the assessment of TMJ conditions. 19 In another study by the same authors using the same in vitro material, no significant differences were found, neither with normal nor high resolution. 20 However, they also concluded that the accuracy of detecting condylar defects highly depends on the CBCT unit used for examination.…”

“…17 The diagnostic accuracy of erosive changes in the TMJ has been shown to be influenced by the imaging protocol in some studies 17,18 but not in others. 19,20 Dry human skulls were scanned with large view and standard view protocols by Zhang et al, 19 who found no significant difference between the examinations for the presence or absence of defects on the surface of the condyles. Both scanning protocols were reliable, with areas under the receiver operating characteristic curves being 0.739 and 0.720, respectively.…”

Diagnostic reliability of 3.0-T MRI for detecting osseous abnormalities of the temporomandibular joint

“…After screening examinations, CT and CBCT are used in clinical practice for assessing the structure of small bones in the oral and maxillofacial region. Limited-field-of-view (FOV) CBCT is frequently used to evaluate small structures such as teeth, and clinical and experimental studies have shown the benefits of CT and CBCT for oral maxillofacial diagnosis (1)(2)(3)(4)(5). These two modalities differ in visualization of soft tissue, FOV, resolution, radiation dose, and cost (1).…”

Morphometric Evaluation of the Mental Foramen Using Cone Beam Computed Tomography in Different Facial Types.

“…The inferior alveolar nerve bundle enters the lower jawthrough the mandibular foramen, passes along the mandibular canal and exits from the mental foramen as the mental nerve on the body of the mandible above the tubercleof the chin [3] .Determining the precise location of the mental foramen is a key factor when considering placing dental implants or when surgical proceduresare planned in the foramenregion [4] . The precise location of such foramen is also important in some dental specialties including Operative Dentistry, Periodontics, Endodontics and OrthognathicSurgery, whenever a local anesthesia procedure is to be carried out [5][6][7][8] . In adults, the mental foramen islocated on average between 13mm and 15mm above the inferior mandibular border, but in adults presenting with bone resorption, the foramen is located closer to the alveolar crest and sometimes over it [9] .One problem in determining the precise location of the mental foramen is that such a structure cannot be neither visualized nor palpated and thus, more advanced visualization techniques DOI: 10.9790/0853-1606037885 www.iosrjournals.org 79 | Page have to be used.…”