RESUMO
PURPOSE: The aim of the study was to present a methodology of development of a virtual 3-dimensional dental implant model for analyses via the finite element method. MATERIALS AND METHODS: A set, consisting of a dental implant and abutment, was embedded in acrylic resin for subsequent metallographic grinding and polishing. After the evidentiation of the internal geometry of the implant, the specimen was treated in a sputter for observation using scanning electron microscopy (SEM). The SEM image was transported to computer-aided design software by which all details of the implant were measured. With the measures obtained, the geometry was reproduced with 3-dimensional modeling software. Finally, the model was imported into finite element method analysis software with which it was discretized, generating a mesh. RESULTS: A model with the accurate geometry of the implant was developed. A mesh of 297,600 elements and 490,045 nodes was generated. An aleatory acceleration simulation was performed to test the mesh, and no errors were identified. CONCLUSION: The developed methodology generated a precise dental implant model, which can be applied in different finite element method simulations.
Assuntos
Simulação por Computador , Implantes Dentários , Análise de Elementos Finitos , Imageamento Tridimensional , Modelos Dentários , Planejamento de Prótese Dentária , Análise do Estresse Dentário/métodos , Humanos , Microscopia Eletrônica de Varredura , Reprodutibilidade dos Testes , SoftwareRESUMO
En este estudio se verificó las indicaciones de exodoncias en pacientes con cáncer en región de cabeza e cuello, que serán sometidos a radioterapia, en el servicio de Oncología de la Facultad de Odontología da Universidad Federal de Minas Gerais. Fueran evaluadas 114 historias clínicas y radiografías panorámicas y periapicales y fueran divididos de acuerdo con las indicaciones de exodoncias. Estas indicaciones fueron por caries, enfermedad periodontal, asociaciones de caries y periodontitis, falta de soporte para prótesis, diente incluidos, dientes extruidos, y en algunos casos dientes con indicaciones de extracciones exclusivamente por causa de la radioterapia. Los resultados mostraron que la mayor parte de indicaciones de exodoncias fueron debido a caries (21,05%) y enfermedades periodontales (26,31%). Debido a la predisposición a la pérdida de inserción periodontal y al riesgo de su progresión, pacientes que serán sometidos a la radioterapia de cabeza y cuello deberán ser evaluados en relación a la condición periodontal y a las indicaciones de exodoncia. Este estudio mostró que el diagnóstico de la enfermedad periodontal fue el principal factor relacionado con la indicación de exodoncias previamente al tratamiento oncológico.
The aim of this study was to describe the indication of the exodontias in patients with head embedded tooth, extruded tooth and some cases when indication is because of radiotherapy. The results show that caries (21, 05%) and periodontitis (26, 31%) were the biggest indications of exodontias in these patients. Due to a tendency of attachment loss and bone destruction and the risk of progression, patients that will be under head and neck radiotherapy should be evaluated on the periodontal status e tooth extraction indications. This study shows that the diagnosis of periodontal disease was the main indication to teeth extractions previous to oncological treatment.
