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The use of CBCT in orthodontics has been revolutionary as it provides necessary information for diagnosis and treatment planning. Many concerns are related to the increased risk of exposure resulting from 3D imaging as opposed to 2D imaging in orthodontics.
The aim of our study was to compare between effective doses of different imaging modalities applied in orthodontics.
The CS9300 CBCT machine was used for the CBCT exposures using different scanning protocols and parameters for the adult and child, and the hybrid 2D/3D Orthophos SL machine was used for the panoramic radiography and lateral cephalometry. We used two anthropomorphic phantoms in this study: an adult male phantom and a child phantom. Optically stimulated luminescent dosimeters were used for measurements.
For the adult phantom, the least effective dose was achieved by the combination of the 17x11 FOV, extending from the nasion to the menton, at 0.4 mm resolution scan “low dose setting” with the application of full shielding along with the lateral cephalometry with thyroid collar, yielding a total effective dose of 11 μSv which is lower than that obtained by the combination of panoramic and lateral cephalometry with thyroid collar yielding an effective dose of 91.91 μSv. For the child phantom, the 17x11 FOV, extending beyond the distance from the nasion to menton, at 0.4 mm resolution scan “low dose setting” with the application of thyroid collar and radiation safety glasses yielded an effective dose of 10.13 μSv which is lower than that obtained by the combination of the panoramic and lateral cephalometry with thyroid collar yielding an effective dose of 31.37 μSv.