فهرست نشریات علمی دسترسی آزاد ایران

Background: Cone beam computed tomography (CBCT) has been broadly acceptable in recent years as a radiography modality for diagnosis, treatment planning and follow up in dentistry. Some important parameters such as radiation dose, image quality and field of view are considered as a criteria for deciding whether or not a CBCT dental unit is suitable for a particular application. Objectives: This study aims to evaluate the effect of exposure levels on the absorbed dose of mandible and salivary glands according to various settings of milliamperage (mA) in CBCT. Results: The maximum and the minimum absorbed dose was placed in the area related to the right mandible and the left submandibular gland. The increase of absorbed dose by mA increase was meaningful in the confidence level of 95% for all scanned areas. By changing mA from 2 to 12, the absorbed dose varied significantly with a maximum 5.44-fold variation between the highest and lowest dose for the parotid gland. Conclusion: This study has shown that there is a meaningful relationship between the increase of mA and increase of absorbed dose in different parts of the dentomaxillofacial area, including the mandible, submandibular and parotid glands. It is concluded that as long as the image quality is acceptable for diagnostic purposes, the mAs of the CBCT should be kept in a low range to minimize the absorbed dose.