Abstract Introduction Grossly displaced membranes are characteristic of endolymphatic hydrops. The process whereby physiological membrane displacement becomes pathological may be mediated by stress, but the membrane biomechanics underlying this transition are unclear. Objective This study seeks to de...
Abstract The aim of this study was to evaluate the effect of varying the diameter, connection type and loading on stress distribution in the cortical bone for implants with a high crown-implant ratio. Six 3D models were simulated with the InVesalius, Rhinoceros 3D 4.0 and SolidWorks 2011 software program...
RESUMO Objetivo: verificar a relação entre grau de complexidade do cuidado de pacientes, nível de estresse e coping nos profissionais de enfermagem em unidades de internação adulto de um hospital universitário de Porto Alegre. Método: pesquisa quantitativa transversal, desenvolvida em três unid...
Objetivo: analisar as fontes estressoras em pacientes de unidade de terapia intensiva neonatal. Métodos: estudo transversal, desenvolvido em maternidade pública de referência, com 60 profissionais de enfermagem que prestaram cuidados aos 24 recém-nascidos internados. Para coleta de dados, foi utiliza...
Abstract This in vitro study evaluated the fatigue strength of different ceramic materials indicated for monolithic restorations. Disc-shaped specimens were made according to ISO 6872 from five different ceramic materials: feldspathic ceramic (FC), polymer-infiltrated ceramic network (PIC), lithium disil...
Cerámica/química,
Diseño Asistido por Computadora,
Porcelana Dental/química,
Fracaso de la Restauración Dental,
Análisis del Estrés Dental,
Ensayo de Materiales,
Microscopía Electrónica de Rastreo,
Docilidad,
Valores de Referencia,
Reproducibilidad de los Resultados,
Estrés Mecánico,
Propiedades de Superficie,
Resistencia a la Tracción,
Circonio/química
Abstract Objective The purpose of this study was to evaluate, by using finite element analysis, the influence of post location and occlusal loading location on the stress distribution pattern inside the root canals of the mandibular 1st molar. Material and Methods Three different 3-D models of the ma...
Fuerza de la Mordida,
Modelos Dentales,
Cavidad Pulpar,
Análisis del Estrés Dental/métodos,
Módulo de Elasticidad,
Análisis de Elementos Finitos,
Imagenología Tridimensional/métodos,
Mandíbula,
Diente Molar,
Técnica de Perno Muñón,
Valores de Referencia,
Reproducibilidad de los Resultados,
Estrés Mecánico,
Propiedades de Superficie,
Soporte de Peso
Abstract Objective The aim of this study was to evaluate the influence of torsional preloading on the cyclic flexural fatigue resistance of thermally treated NiTi instruments. Material and Methods Ten new instruments New Hyflex CM (HF 30.06; Coltene/Whaladent Inc.), Typhoon CM (TYP 30.06; Clinician's...
Instrumentos Dentales/normas,
Diseño de Equipo/métodos,
Falla de Equipo,
Ensayo de Materiales,
Microscopía Electrónica de Rastreo,
Níquel/química,
Docilidad,
Valores de Referencia,
Reproducibilidad de los Resultados,
Preparación del Conducto Radicular/instrumentación,
Rotación,
Estrés Mecánico,
Propiedades de Superficie,
Temperatura,
Factores de Tiempo,
Titanio/química,
Torsión Mecánica
Abstract High levels of shrinkage stress caused by volumetric variations during the activation process are one of the main problems in the practical application of composite resins. Objective The aim of this study is to reduce the shrinkage stress and minimize the effects caused by composite resin volu...
Adhesividad,
Resinas Compuestas/química,
Resinas Compuestas/efectos de la radiación,
Análisis del Estrés Dental,
Curación por Luz de Adhesivos Dentales/métodos,
Ensayo de Materiales,
Microscopía Electrónica de Rastreo,
Transición de Fase/efectos de la radiación,
Polimerizacion/efectos de la radiación,
Valores de Referencia,
Espectroscopía Infrarroja por Transformada de Fourier,
Estrés Mecánico,
Factores de Tiempo
ABSTRACT Objective: Evaluate changes in the force system of T-Loop Springs (TLS) preactivated by curvature, due to stress relaxation. Methods: Ninety TLSs measuring 6 x 10 mm, produced out with 0.017 x 0.025-in TMA® wire and preactived by gradual curvature, were randomly distributed into nine groups ...
Fenómenos Biomecánicos,
Aleaciones Dentales/química,
Análisis del Estrés Dental,
Ensayo de Materiales,
Diseño de Aparato Ortodóncico,
Cierre del Espacio Ortodóncico/instrumentación,
Alambres para Ortodoncia,
Distribución Aleatoria,
Estadísticas no Paramétricas,
Estrés Mecánico,
Factores de Tiempo,
Titanio/química
Pressure ulcers are tissue damage resulting from the constant pressure on the underlying soft tissue to bony prominences for long periods. Some of the most common ulcers are developed at the ischial tuberosities area (ITs). It has been found that stresses produced in the underlying tissue to the ITs may ...
