Patient artefacts in dental cone beam CT scans can happen for various reasons. These range from artefacts from metal restorations to movement. An audit was carried out in the Glasgow Dental Hospital analysing how many scans showed signs of "motion artefact", and then to assess if there was any correlation between patient age and movement artefacts. Specific age demographics were then analysed to see if these cohorts were at a higher risk of "movement artefacts". Dentomaxillofacial Radiology ( Keywords: hospital radiology departments; cone beam computed tomography Patient artefacts in dental cone beam CT (CBCT) scans can happen for various reasons. These range from artefacts from metal restorations to movement.

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Objective How much of a full width panoramic radiograph is required for diagnosis and treatment planning in Oral Surgery? Study design In this retrospective study, the panoramic radiograph was divided into five equal vertical segments and assessed as to the number of segments required for diagnosis and treatment planning in relation to their initial referral. Incidental findings outside the areas required were investigated as to whether or not they influenced treatment planning. Results From images of 823 patients; over half (56.5%) required only one segment of the image for diagnostic purposes in relation to their referral. The posterior mandible and temporomandibular joint areas were required least (5.3%), followed by the midline segment (10.0%). The segments required most often were the molar and premolar regions bilaterally (84.7%). In 15.8%, incidental findings were observed outside of the segments requested, but these only influenced treatment planning in 2.9% of cases. Conclusion In this study of patients attending an oral surgery service, a full width panoramic tomograph was not required in most instances. Referrals for segmental panoramic imaging should be regarded as regular rather than unusual practice.