RESUMEN
Radiometric surveys in radiotherapy bunkers have been carried out in Brazil for many years, both by the same radiotherapy facility for verification of shielding as by the regulatory agency for licensing and control purposes. In recent years, the Intensity Modulated Radiation Therapy (IMRT) technique has been gradually incorporated into many facilities. Therefore, it has been necessary to consider the increased leakage component that has an important impact on the secondary walls. For that, a radiometric survey method has been used that considers an increased 'time of beam-on' for the secondary walls. In this work we discuss two methods of doing this: the first considers that this 'time of beam-on' affects the sum of the two components, leakage and scattered. In another method it is considered that only the leakage component is affected by this extended 'time of beam-on'. We compare the methods and show that for secondary walls withU= 1 the first method overestimates dose rates by important percentages and for secondary walls withU< 1 it can both overestimate or underestimate the dose rates, depending on the parameters of the project. An optimized procedure is proposed, according to the use factor (U) of the secondary wall to be measured.
Asunto(s)
Protección Radiológica , Radioterapia de Intensidad Modulada , Protección Radiológica/métodos , Radiometría/métodos , Radioterapia de Intensidad Modulada/métodos , Planificación de la Radioterapia Asistida por Computador/métodosRESUMEN
Amelogênese imperfeita é uma doença hereditária que afeta a qualidade e a quantidade de esmalte. Os pacientes usualmente sofrem de complicações orais e estéticas que afetam diretamente sua qualidade de vida. O adequado diagnóstico e o correto planejamento são fundamentais para obter resultados previsíveis e satisfatórios. O objetivo deste artigo é apresentar um relato de caso clínico para o tratamento de uma paciente com amelogênese imperfeita (AI) em que estética e função foram reabilitadas com cirurgia plástica gengival e laminados cerâmicos...
Amelogenesis Imperfecta is a hereditary condition which affects the quality and quantity of enamel. Patients usually suffer from oral and aesthetic complications that affect directly their quality of life. Accurate diagnosis and correct planning are fundamental to obtain predictable and satisfactory results. The aim of this manuscript is to present a clinical case report for the treatment of a patient affected by amelogenesis imperfecta (AI), which aesthetics and function was rehabilitated with gingival plastic surgery and ceramic veneers...
Asunto(s)
Humanos , Femenino , Adolescente , Amelogénesis Imperfecta , Amelogénesis Imperfecta/terapia , Cerámica , Coronas con Frente Estético , Estética Dental , Esmalte Dental/anomalías , Encía/cirugía , Calidad de VidaRESUMEN
The symmetry, shape, contour, and size of teeth play an important role in the esthetics of the anterior maxillary region of the mouth. However, abnormalities in symmetry and contour can considerably influence the esthetic parameters. Consequently, rehabilitation performed in this region can be challenging and, frequently, multidisciplinary treatment planning that includes esthetics, function, structure, and biologic aspects is paramount. The high demand for esthetic rehabilitations has, therefore, allowed the effective use of minimally invasive techniques to obtain results that mimic natural teeth. This article presents a case report in which both esthetic and functional rehabilitation were obtained by recontouring the gingival zenith followed by placing ultraconservative porcelain veneers.