RESUMO
This article presents a method of cephalometric tracing and analysis using the basilar view cephalogram and discusses its role in diagnosis and treatment planning. Landmarks and structures found in each of three separate basilar planes are defined and instructions for tracings are presented. The analysis is applied to the study of orbital hypertelorism, craniofacial synostosis, and hemicraniofacial microsomia. The multiplane tracing technique is demonstrated to provide a three-dimensional concept of deformities in the craniofacial skeleton. A method to determine an anteroposterior midline construct from structures in the cranial base is described. As is practiced with the lateral cephalogram, presurgical tracings of the basilar film may be manipulated to simulate the skeletal changes anticipated in surgery.
Assuntos
Cefalometria/métodos , Craniossinostoses/diagnóstico , Craniossinostoses/patologia , Face/anatomia & histologia , Assimetria Facial/diagnóstico , Assimetria Facial/patologia , Ossos Faciais/anatomia & histologia , Humanos , Hipertelorismo/diagnóstico , Hipertelorismo/patologia , Mandíbula/anatomia & histologia , Maxila/anatomia & histologia , Órbita/anatomia & histologia , Crânio/anatomia & histologiaRESUMO
Unlike superficial x-rays, the soft x-rays normally used in dermatologic practice spare unaffected underlying organs during treatment of cutaneous malignancies. However, since the dose with depth from soft x-rays varies markedly, it is important to know this relationship for optimal therapeutic results. The peak kilovoltage, and thus the energy of the beam, is generally selected so that the dose to the base of the lesion is one-half the surface dose. An absorbed dose of 3,400 rads to the surface and a dose of about one-half this amount to the base of most malignant lesions is one standard protocol for optimal therapeutic results. An accurate value of half-depth dose in skin is therefore necessary and is readily obtained from ordinary half-value layer measurements using the technic described.
Assuntos
Dosagem Radioterapêutica , Neoplasias Cutâneas/radioterapia , Alumínio , Relação Dose-Resposta à Radiação , Humanos , Cimento de Policarboxilato , Raios XRESUMO
A study was undertaken to study the regeneration potential of surgically created parietal bone defects in newborn and fully grown rabbits. The results indicated that regeneration is greater in the newborn rabbits, especially if the periosteum and dura are preserved.