Consulta: creatorFacets:"Freire,Alexandre Rodrigues"
Registros recuperados: 7
Data/hora: 03/06/2024 08:40:10

Stress Distribution in Human Zygomatic Pillar Using Three-Dimensional Finite Element Analysis
Provedor de dados: 77
Autores: Prado,Felippe Bevilacqua; Noritomi,Pedro Yoshito; Freire,Alexandre Rodrigues; Rossi,Ana Cláudia; Neto,Francisco Haiter; Caria,Paulo Henrique Ferreira.
This paper aimed to analyze stress distribution in human zygomatic pillar during masseter muscle contraction using three-dimensional finite element analysis. A three-dimensional model and hemi facial skull were produced based on CT-scan data. An adult male skull with structural anatomy integrity was used as model. Muscles forces were applied at origin of elevator muscles and supports was applied at the occlusal surfaces at first and second molars to simulate a masticatory load and stimulate the zygomatic pillar. Supports were applied to the occlusal contacts. Symmetry conditions were placed at the mid-sagittal plane. For the top and back cutting plane, constraints were used. Equivalent Von-Mises Stress and Maximum Principal Stress analysis were performed...
Tipo: Journal article
Palavras-chave: Biomechanics; Skull; Finite element analysis.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400038

Incidence of Retromolar Foramen in Human Mandibles: Ethnic and Clinical Aspects
Provedor de dados: 77
Autores: Rossi,Ana Cláudia; Freire,Alexandre Rodrigues; Prado,Guilherme Bevilacqua; Prado,Felippe Bevilacqua; Botacin,Paulo Roberto; Caria,Paulo Henrique Ferreira.
The retromolar foramen allows the passage of the neurovascular bundles that contribute to nutrition and innervation of the pulp and periodontium of the lower teeth. Knowledge of this anatomical variation may prevent complications in the anesthesia and surgical procedures in this area and serve as an anatomical landmark for ethnic identification. The aim of this study was to evaluate the impact of the retromolar foramen in human mandibles of adult Brazilians and discuss the clinical and ethnic related to the presence of this foramen. Were evaluated 222 human mandibles, dry, adults, Brazilians, independent of gender. The evaluation was performed by two examiners who standardized search from a previous anatomical study. The mandibles were analyzed: the...
Tipo: Journal article
Palavras-chave: Foramen; Retromolar; Anesthesia; Mandible.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300051

Emissary Foramens of the Human Skull: Anatomical Characteristics and its Relations with Clinical Neurosurgery
Provedor de dados: 77
Autores: Freire,Alexandre Rodrigues; Rossi,Ana Cláudia; de Oliveira,Viviane Cristina Souza; Prado,Felippe Bevilacqua; Caria,Paulo Henrique Ferreira; Botacin,Paulo Roberto.
The recognition of emissary foramens is important not only for understanding the regional neurovascular anatomy, but also to distinguish normal from potentially abnormal structures. Thus, the aim of this study was to review the literature on anatomical and clinical aspects of the mastoid, parietal and sphenoid emissary foramens. It was found that the emissary foramen presents importance in clinical practice because it acts as a route of spread of extracranial infection to the intracranial structures and also possible complications in neurosurgery, due to its influence in the performance of techniques such as radiofrequency rhizotomy for treatment of trigeminal neuralgia. The anatomical knowledge of the emissary foramens is important due to variability in...
Tipo: Journal article
Palavras-chave: Emissary foramens; Veins; Neurosurgery; Dura mater.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100045

Piriform Aperture Morphometry and Nasal Bones Morphology in Brazilian Population by Postero-Anterior Caldwell Radiographys
Provedor de dados: 77
Autores: Prado,Felippe Bevilacqua; Caldas,Ricardo Armini; Rossi,Ana Cláudia; Freire,Alexandre Rodrigues; Groppo,Francisco Carlos; Ferreira Caria,Paulo Henrique; Júnior,Eduardo Daruge.
Piriform aperture and nasal bone contribute to the formation of the nose. Its morphology varies according to ethnic group and gender. The piriform apertures and nasal bones of 97 individuals were examined radiographically through Caldwell radiographic technique and the types of nasal bones were classified according to Hwang et al. (2005). The width, height and area of piriform aperture were measured to demonstrate the difference according to gender. Statistical analysis was performed from the Student t test and analysis of variance (ANOVA). The most frequent type of nasal bone was A, and D was the most uncommon in both genders. In the Student t test significant differences between genders, height, width and area of the piriform aperture were obtained and...
Tipo: Journal article
Palavras-chave: Nasal bones; Morphometry; Nasal cavity; Skull.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200014

Relations Between the Mandibular Canal and I, II and III Angle Classes in Panoramic Radiographs
Provedor de dados: 77
Autores: Falkine,Raisa Zago; Rossi,Ana Cláudia; Freire,Alexandre Rodrigues; Figueroba,Sidney Raimundo; Groppo,Francisco Carlos; Caria,Paulo Henrique Ferreira; Prado,Felippe Bevilacqua.
To prevent injury to the inferior alveolar nerve during dental procedures, knowledge of its anatomical location and course of the mandibular canal is imperative. The aim of this study was evaluate the location on panoramic radiographs of the mandibular canal in relation to the apices of the permanent mandibular molars and base mandible, and relate the type of mandibular canal with Angle classes I, II and III. We evaluated 748 panoramic radiographs distributed according to sex and occlusal class (Angle I, II and III) of fully dentate individuals, 18­51 age group. The radiographs were divided according to Angle classes based on cephalometric tracing, clinical data from the medical records of each individual and the analysis of of the maxillar and mandibular...
Tipo: Journal article
Palavras-chave: Mandibular canal; Mandible; Panoramic radiograph; Malocclusion; Molars.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200012

Biomechanics of the Human Canine Pillar Based on its Geometry Using Finite Element Analysis
Provedor de dados: 77
Autores: Freire,Alexandre Rodrigues; Prado,Felippe Bevilacqua; Rossi,Ana Cláudia; Noritomi,Pedro Yoshito; Neto,Francisco Haiter; Caria,Paulo Henrique Ferreira.
This study evaluated the stress distribution based on the canine pillar geometry in human skull, using a finite element analysis. Computed tomography of human skull was used to build a finite element model, which was composed by all bony structures of canine pillar: canine eminence, canine fossa, frontal process of maxilla, glabellum and superciliary arch. A support on the bite contact of maxillary canine tooth and a resultant force of the masticatory muscles was applied in the simulation. Equivalent Von-mises and maximum principal stresses were analyzed along the structures that compose the canine pillar geometry. Von-mises stress presented high stress concentrated at the canine fossa and frontal process of maxilla. Maximum principal stress showed...
Tipo: Journal article
Palavras-chave: Skull; Biomechanics; Finite element analysis.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100036

Computer Graphics Applied to Anatomy: A Study of two Bio-CAD Modeling Methods on Finite Element Analysis of Human Edentulous Hemi-Mandible
Provedor de dados: 77
Autores: Rossi,Ana Cláudia; Freire,Alexandre Rodrigues; Botacin,Paulo Roberto; Caria,Paulo HenriqueFerreira; Prado,Felippe Bevilacqua.
Modeling is a step to perform a finite element analysis. Different methods of model construction are reported in literature, as the Bio-CAD modeling. The purpose of this study was to perform a model evaluation and application using two methods of Bio-CAD modeling from human edentulous hemi-mandible on the finite element analysis. From CT scans of dried human skull was reconstructed a stereolithographic model. Two methods of modeling were performed: STL conversion approach (Model 1) associated to STL simplification and reverse engineering approach (Model 2). For finite element analysis was used the action of lateral pterygoid muscle as loading condition to assess total displacement (D), equivalent von-Mises stress (VM) and maximum principal stress (MP). Two...
Tipo: Journal article
Palavras-chave: Computational modeling; Mandible; Finite element analysis; Biomechanics.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300011