Abstract
Objective: The purpose of our research was to study comparative cephalometric analysis between left and right sides of head and evaluate the skeletal facial symmetry in patients with class 1 malocclusion by 3D Cone-beam computed tomography (CBCT). Materials and Methods: Pre-treatment by 3D Cone-beam computed tomography radiographs for 20 patients of two age groups with class 1 malocclusion was undergone for 11 angular and 4 liner measurements from right and left sides, anteroposterior, vertical and frontal view by hand except the hard landmarks determination. Chi-test was used to compare the result of both sides (P < 0.05). Results: No difference was found between left and right analysis for linear measurements as for the angular cephalometric measurements. Conclusion: Measurements of skeletal analysis by 3D CBCT cephalograms from right side were found to be similar to left side. So, we can use the left analysis for orthodontics diagnosis as right side. Also, the both sides analysis can be used for symmetric analysis reasons.
Highlights
Cephalometric analysis is an important orthodontics diagnostic tool for evaluation of dentofacial morphology, treatment plan and follows up
Materials and Methods Twenty 3D Cone-beam computed tomography (CBCT) for patients (7 males, 13 females) with age ranging from 8 to 34 year were screened for the following criteria. - All subjects have normal skeletal relation. - Good facial symmetry/proportion was shown. - None of the subjects should have undergone any orthodontic or maxillofacial/plastic surgery in the past. - Cases were chosen for inclusion only on the basis of balance of facial parts, and quality of parts was disregarded. - Handwork measurement analysis except the landmarks determination. - Ethical Approval and acquisition of Informed Consent was obtained for all cases
As shown in from anteroposterior measurements the difference in the angles that formed by Unilateral landmarks (ANB) angle between the right and left sides (-0.183) where it at right 4.238095 with standard deviation (SD) 1.68 while it at left side 4.42 with SD 1.74 . p-value (p < 0.99) were not statistically significant, ANB angle represent relationship of both arches to frontal bone.from the result the most symmetric angle for both side it was inOR-inOR where the DF= 0
Summary
Cephalometric analysis is an important orthodontics diagnostic tool for evaluation of dentofacial morphology, treatment plan and follows up. It provides a clear image of the skeletal changes that occur in the process of growth and treatment of patients. Magnification is calculated by dividing the distance from the source of radiation to the image receptor (SID) by the distance from the source to the object of interest (SOD). Based on this calculation, it is easy to see that the right and left sides of the skull will be different sizes in a lateral cephalogram [1]
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