Abstract
Objective: The aim of the present study was to compare the right and the left sides of symmetrical individuals´ skull through images generated by cone-beam computed tomography (cbct). Methods: The sample consisted of 35 scans from the 3d-i-cat (imaging sciences international inc., hatfield, usa) of 13 male and 22 female individuals, aged between 8 and 64, who showed acceptable facial symmetry. The images were entered into the invivodental 5.0 software (anatomage, san jose, usa) and positioned analogously to the patient´s head posture to get a lateral cephalometric radiography. Go-me, go-cd, s-cd, co-gn, and co-a linear distances (mm); mego.cd, fma, and gogn. sn angles (degrees), as well as five condyle-glenoid fossa linear distances (mm) were the bilateral variables analyzed. Results: Statistically significant difference between the right and the left sides was only verified when s-cd (mm) was assessed. Conclusion: therefore, there is no need to obtain bilateral values of these variables (except s-cd) to assess the skull of individuals with no evident asymmetries. In relation to s-cd variable, the difficulty to mark the sella point (s) in a 3-dimensional study created inexistent discrepancies between the right and the left condyles position.
Highlights
Cone-beam computed tomography (CBCT) is a diagnostic element that allows the imaging and the visualization of structures under different angles
CBCT is able to provide a larger amount of information than a whole set of radiographs routinely used in orthodontics, with the advantage of a lower radiation dose [8,9,10]
The following exclusion criteria were applied: facial asymmetry, cases treated with orthognathic surgery and images that evidenced the absence of part of the maxilla, mandible, or the upper border of the external acoustic meatus
Summary
Cone-beam computed tomography (CBCT) is a diagnostic element that allows the imaging and the visualization of structures under different angles. CBCT is able to provide a larger amount of information than a whole set of radiographs routinely used in orthodontics (periapical, panoramic, and cephalometric), with the advantage of a lower radiation dose [8,9,10]. Better access to this new technology is redirecting the two-dimensional diagnosis toward a three-dimensional visualization of the craniofacial structures [2,10,11]. In the typical cephalometric analysis, the left structures are used as references as they are nearer the radiographic film and, present less distortion. An important question is: To what extent can these compensations be efficient?
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