Abstract
Objective: The aim was to investigate the accuracy of linear measurements the mandibular ridge recorded using two CBCT systems. Materials and Methods: Eleven human dry skull were used in which mandibles were chosen to measure width and height in 6 sites. Before scanning, the points were marked using barium sulfate radiopaque contrast media. Mandible imaging was done using two systems: Newtom3G and Cranex3D. Alveolar ridge dimensions were recorded by two observers under uniform condition using special software for each system. The measurement errors and inter-examiner reliability were calculated for each modality and compared with each other and analyzed via SPSS software version 18. The level of significance was set at P< 0.05. Results: The overall mean absolute error was 0.08 mm for Cranex system and 0.5 for Newtom system. The mean absolute error of two systems had no statistically significant difference in comparison with each other or with the gold standard. The statistical analysis showed high inter-observer reliability (P < 0.05). Conclusion: CBCT is highly accurate and reproducible in linear measurements in the axial and coronal images planes and in different areas of the maxillofacial region.Keywords: Barium sulfate; Cranex3D; Cone beam computed tomography; Dental implant; Newtom3G.
Highlights
P rovision of dental implants for patients who have lost their teeth is a common practice
Computerized Tomography (CT) technique provides cross-sections but it exposes the patient to high radiation doses
Presurgical assessment to evaluate the dimensions of the available alveolar bone in width and height is important especially when anatomical structures in cases with great bone loss are in proximity. [17,18] Conventional radiography such as panoramic and periapical radiographs do not provide cross-sectional information, and are insufficient for implant site evaluation
Summary
P rovision of dental implants for patients who have lost their teeth is a common practice. Intraoral and panoramic techniques cannot provide 3-dimensional images in order to determine the dimensions of bone to prepare an ideal treatment plan before implant placement. Computerized Tomography (CT) technique provides cross-sections but it exposes the patient to high radiation doses. The principle behind this technique, as its name implies, is a cone-shaped X-ray , with the X-ray source and detector rotating around appoint On field of interest of the patient. The cone-beam technique uses rotational scanning of an X-ray source, reciprocating an X-ray detector around the patient head. The NewTom 3G is a CBCT machine that specially designed for volume imaging of the maxillofacial region In this device, the patient lies supine on the couch, as in conventional CT, and head centred in the gantry. The following areas underwent measurements: 1. Two anterior areas of the left and right central incisor teeth
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