Results: 118

Análise biomecânica de opções protéticas para reabilitação de maxila posterior com próteses implantossuportadas de três elementos: estudo pelo método dos elementos finitos 3D

Proposição: O propósito do estudo foi estudar o comportamento biomecânico de próteses de três elementos implantossuportadas diante das seguintes variáveis: união (coroas unitárias e esplintadas: em linha reta e em posicionamento tripoidal), comprimento e diâmetro do implante, além da redução...

Influence of ceramic material, thickness of restoration and cement layer on stress distribution of occlusal veneers

Abstract The aim of this study was to evaluate stress distribution in an occlusal veneer according to the restorative material, restoration thickness, and cement layer thickness. A tridimensional model of a human maxillary first molar with an occlusal veneer preparation was constructed using a modeling s...

3-D finite element analysis of the effects of post location and loading location on stress distribution in root canals of the mandibular 1st molar

J. appl. oral sci; 26 (), 2018
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...

Influence of remaining coronal thickness and height on biomechanical behavior of endodontically treated teeth: survival rates, load to fracture and finite element analysis

J. appl. oral sci; 26 (), 2018
Abstract Objective To evaluate the effect of restorative strategy (fiber post vs cast post and core), coronal height (0 mm vs 2 mm) and thickness (higher than 1 mm vs lower than 1 mm) on survival rate, fracture resistance and stress distribution. Material and Methods Seventy-two bovine teeth were clean...

Effect of cavity preparation design and ceramic type on the stress distribution, strain and fracture resistance of CAD/CAM onlays in molars

J. appl. oral sci; 26 (), 2018
Abstract Objective This study aimed to evaluate the effect of the cavity preparation and ceramic type on the stress distribution, tooth strain, fracture resistance and fracture mode of human molar teeth restored with onlays. Material and Methods Forty-eight molars were divided into four groups (n=12)...

Utilização de modelos geométricos simplificados de uma córnea para fins de otimização

Rev. bras. oftalmol; 76 (6), 2017
Resumo Otimização por Enxame de Partículas (PSO) é uma técnica de inteligência artificial (AI), que pode ser usada para encontrar soluções aproximadas para problemas numéricos de maximização e minimização extremamente difíceis. Neste trabalho, utilizou-se um algoritmo PSO para comparar os d...

Mechanical behavior of anterior fixed partial dentures made of different materials subjected to static and dynamic loads

ABSTRACT. Introduction: the purpose of this study was to assess the mechanical behavior of lithium disilicate, alumina, and zirconia-based ceramic restorations, as well as metal-ceramic restorations, under static and dynamic load, in an upper anterior fixed site. Methods: four models of fixed partial ...

Comparison of short-segment monoaxial and polyaxial pedicle screw fixation combined with intermediate screws in traumatic thoracolumbar fractures: a finite element study and clinical radiographic review

Clinics; 72 (10), 2017
OBJECTIVES: No studies have compared monoaxial and polyaxial pedicle screws with regard to the von Mises stress of the instrumentation, intradiscal pressures of the adjacent segment and adjacent segment degeneration. METHODS: Short-segment monoaxial/polyaxial pedicle screw fixation techniques were compa...

Distribution of stress on TMJ disc induced by use of chincup therapy: assessment by the finite element method

ABSTRACT Objective: To assess the distribution of stress produced on TMJ disc by chincup therapy, by means of the finite element method. Methods: a simplified three-dimensional TMJ disc model was developed by using Rhinoceros 3D software, and exported to ANSYS software. A 4.9N load was applied on the ...

Análise tridimensional de elementos finitos da distribuição de tensões em implantes inclinados: uma revisão de literatura

Implantes inclinados atualmente são utilizados como uma alternativa cirúrgica e protética. Por tanto, estudos in vitro demonstram que o seu uso aumenta a concentração de tensão no osso cortical peri-implantar e questionasse se esse fator pode levar ao insucesso da reabilitação oral estética. O o...