Assessment of mandibular third molar position by using computed tomography and reconstructed lateral radiograph

Abstract

Background: Consideration of mandibular third molar is important from orthodontic perspective due to severalfactors such as, lower anterior arch crowding, relapse in lower anterior region, interference with uprighting ofmandibular first and second molars during anchorage preparation and molar distalization. The aims of this studywere to assess of gender differences in the mandibular third molar position and compare and evaluate whetherthere is any differences in the results provided by CT scan and lateral reconstructed radiograph.Materials and Methods: The sample of present study consisted of 39 patients (18 males and 21 females) with agerange 11-15 years. CT images for patients who were attending at Al Suwayra General Hospital/the ComputerizedTomography department. Computed tomographic images were obtained for The distance from Xi point to distalsurface of permanent mandibular second molar was measured in both three dimensional volumetric images andtwo dimensional CT derived lateral image. The statistical analyses included: means, standard deviations. Paired t-testwas used to compare between the two methods and independent t-test was used in verifying the gendersdifference.Results: The results showed that there was high significant method difference between 3D CT and 2D image andgender differences was observed in values of linear measurements of present study, as males showed higher meanvalues than females.Conclusion: There is high accuracy of measurement on CT images, so CT scan is advisable during the diagnosis andtreatment plan of orthodontic cases