[Comparative roentgenological representation of the temporomandibular joint].
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Biomedical subjects
Publications and source records attributed to K Ott.
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The Jankelson mandibular kinesigraph is intended to reproduce the movements of the mandible electronically. Analyses of the measurements and clinical studies of linearity, reproducibility, and susceptibility to the electromagnetic fields showed that quantitative and qualitative evaluations of the recordings are impossible. The device therefore appears to us to be unsuitable for the clinical diagnosis of abnormal movements of the mandible and disturbances in occlusion.
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Stuart pantography records the extreme movements of the mandible. A modified reproducible method is described which furnishes comparable graphs, if the apparatus is mounted and the pantographic records are made in a standardized way corresponding to the geometric relations. This standardized method is presented and discussed.
In an experimental investigation, Stuart pantographic records are geometrically analyzed. The influence of the parameters' inclination and curving of condylar guidance, intercondylar distance, Bennett angle, distance of the plate, and position of the recording pencil are studied. Further quanitative analysis was not performed, as Stuart pantography is only meant for transmission to the respective articulator and is nto suitable for metric recording.
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The authors discuss two examples of extensive migration of retained metallic foreign bodies. The potential for further neurological injury from migration, formation of neurotoxic breakdown products, and the danger of infection are factors to be assessed when considering the removal of retained intracranial metallic foreign bodies.
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This article examines the changing nature of patient education and the reasons why radiologic technologists must take a role in educating patients. The elements of teaching and effective communication are discussed, along with barriers to learning and ways to assess patients' readiness to learn. The article concludes with teaching examples drawn from mammography, magnetic resonance imaging, angiography and radiography.
Osteoporosis, a clinically detectable decrease in bone density, affects 24 million Americans, placing them at increased risk for fractures. This article describes the anatomy and physiology of bones and the detection, treatment and prevention of osteoporosis. Techniques for bone densitometry are emphasized, including conventional radiography, single photon and single energy x-ray absorptiometry, dual photon absorptiometry, dual energy x-ray absorptiometry, quantitative CT and ultrasound.