RESUMEN
We present the update of the recommendations of the French society of oncological radiotherapy on bone metastases. This is a common treatment in the management of patients with cancer. It is a relatively simple treatment with proven efficacy in reducing pain or managing spinal cord compression. More complex treatments by stereotaxis can be proposed for oligometastatic patients or in case of reirradiation. In this context, increased vigilance should be given to the risks to the spinal cord.
Asunto(s)
Neoplasias Óseas/radioterapia , Neoplasias Óseas/secundario , Densidad Ósea/efectos de la radiación , Neoplasias Óseas/diagnóstico por imagen , Neoplasias Óseas/cirugía , Dolor en Cáncer/radioterapia , Francia , Humanos , Órganos en Riesgo/diagnóstico por imagen , Cuidados Posoperatorios , Oncología por Radiación , Radioterapia Conformacional/métodos , Radioterapia Guiada por Imagen/métodos , Reirradiación , Compresión de la Médula Espinal/radioterapia , Fracturas de la Columna Vertebral/complicaciones , Fracturas de la Columna Vertebral/radioterapia , Carga TumoralRESUMEN
Measurement of anterior and medial inclinations of third molars from 10 to 18 years of age in monozygotic twins finds a consistent pattern of uprighting, with high correlations within twin pairs indicative of strong genetic influence.
Asunto(s)
Tercer Molar/anatomía & histología , Gemelos Monocigóticos , Gemelos , Adolescente , Cefalometría , Niño , Femenino , Humanos , Masculino , Mandíbula , Tercer Molar/fisiología , Odontogénesis , Embarazo , Erupción Dental , Raíz del Diente/fisiologíaRESUMEN
Natural head position (NHP) provides the key for meaningful cephalometric analysis because an extracranial reference line is used instead of intracranial reference lines, known to be subject to considerable biological variation in their inclination. Although the principle of natural head position is being recognized in the orthodontic literature, its registration may contain an element of unavoidable error that requires correction. A new concept of natural head orientation (NHO) has been introduced to maximize the contribution of NHP to cephalometrics. It is defined as the head orientation of the subject perceived by the clinician, based on general experience, as the natural head position in a standing, relaxed body and head posture, when the subject is looking at a distant point at eye level. The present study was designed to determine the accuracy and validity of NHO, using lateral profile photographs cut in a circular shape, obtained from 27 orthodontic patients, 10-14 years old. Findings among four investigators showed a high correlation (r = 0.82-0.96), in orientating these profile photographs in estimated natural head position (NHP). Moreover, investigators showed good correlation (r = 0.57-0.84) in head orientation after a 3-week interval. Mean differences for the same period varied between 0.1 and 2.9 degrees. The validity of NHO was supported also by a panel investigation. Clinicians as well as auxiliary personnel can be trained to make a critical judgement of the recorded natural head position and correct head orientation, whenever indicated, to enhance the reliability of cephalometric analysis in clinical practice and research.