RESUMO
PURPOSE: The objective of this study was to analyze and compare the stress distribution in the cortical and trabecular bone between the internal hexagon and the Morse taper systems, both with straight abutments. MATERIALS AND METHODS: Two implant systems (Morse taper and internal hexagon connections) were simulated in maxillary bone. Loads of 100 N (axial) and 50 N (oblique) in relation to the implant axes were applied. The 3D finite element method was used to simulate and analyze the present study. The analyzed parameters were ultimate tensile strength and Von Mises stress. RESULTS: Both systems presented stresses below the bone tissue physiological limit as well as a similar distribution in quantitative values, with a higher concentration of tension in the cortical surface near the neck of the implant in the two conditions of applied loads, with higher values for the internal hexagon system. When the groups were evaluated individually, the internal hexagon system showed higher compressive stresses, while in the Morse taper system, the highest values were traction. CONCLUSIONS: There was a difference in the stress location on the prosthetic components of the systems studied; however, it did not influence trabecular bone stress generation.
Assuntos
Interface Osso-Implante/fisiologia , Projeto do Implante Dentário-Pivô , Análise de Elementos Finitos , Fenômenos Biomecânicos , Densidade Óssea/fisiologia , Simulação por Computador , Módulo de Elasticidade , Humanos , Imageamento Tridimensional/métodos , Teste de Materiais , Maxila/anatomia & histologia , Maxila/fisiologia , Modelos Biológicos , Estresse Mecânico , Propriedades de Superfície , Resistência à TraçãoRESUMO
Objetivo: avaliar e comparar o nível de satisfação de pacientes que receberam próteses totais convencionais (PTC) ou overdentures implantorretidas (OIR) estabilizadas com attachment bola na região mandibular. Material e Métodos: aplicação de questionário composto por fatores de satisfação (adaptação, retenção, mastigação, fonética, conforto, condições de higienização, estética e autoestima) e por níveis de satisfação (insatisfeito, satisfeito e muito satisfeito), em 124 pacientes com idade média de 55 anos, divididos em dois grupos: grupo PTC (n = 60) e grupo OIR (n = 64). Resultados: os dados obtidos foram analisados através de análise estatística descritiva e inferencial (teste de Mann-Whitney) e mostraram que os pacientes que receberam OIR demonstraram maior satisfação em todos os fatores avaliados (p < 0,05). Conclusão: a OIR proporciona maior satisfação aos pacientes quando comparada com a PTC; no entanto, há necessidade de mais estudos comparativos em relação a seleção das amostras e aplicação de outros instrumentos de avaliação
Objective: the aim of this study was to evaluate and compare satisfaction levels of patients receiving conventional dentures (CDS) or implant-retained mandibular overdentures (IROVD) with ball attachments. Material and Methods: one-hundred and twenty four patients (mean age 55 years) were divided into two groups: CD (n = 60) and IROVD (n = 64). A questionnaire consisting of several factors (adaptation, retention, chewing, phonetics, comfort, oral hygiene, esthetics, and self-esteem) and levels of satisfaction (unsatisfied, satisfied, and very satisfied) was applied. Descriptive and inferential statistics (Mann-Whitney) were performed. Results: IROVD patients demonstrated greater satisfaction for all factors evaluated (p < 0.05). Conclusion: the IROVD provides better results than CDS. However, there is a need for more comparative studies regarding sample selection and the use of other evaluation instruments.
