Acta odontologica Scandinavica · 2011
Biomechanical effects of two different collar implant structures on stress distribution under cantilever fixed partial dentures.
Сравнительное исследованиеСтатьяНазвание и аннотация: Перевод в очереди
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Merıç Gökçe, Erkmen Erkan, Kurt Ahmet, Eser Atilim, özden Ahmet Utku
Аннотация
OBJECTIVE: The purpose of the study was to compare the effects of two distinct collar geometries of implants on stress distribution in the bone around the implants supporting cantilever fixed partial dentures (CFPDs) as well as in the implant-abutment complex and superstructures.
MATERIALS AND METHODS: The three-dimensional finite element method was selected to evaluate the stress distribution. CFPDs which was supported by microthread collar structured (MCS) and non-microthread collar structured (NMCS) implants was modeled; 300 N vertical, 150 N oblique and 60 N horizontal forces were applied to the models separately. The stress values in the bone, implant-abutment complex and superstructures were calculated.
RESULTS: In the MCS model, higher stresses were located in the cortical bone and implant-abutment complex in the case of vertical load while decreased stresses in cortical bone and implant-abutment complex were noted within horizontal and oblique loading. In the case of vertical load, decreased stresses have been noted in cancellous bone and framework. Upon horizontal and oblique loading, a MCS model had higher stress in cancellous bone and framework than the NMCS model. Higher von Mises stresses have been noted in veneering material for NMCS models.
CONCLUSION: It has been concluded that stress distribution in implant-supported CFPDs correlated with the macro design of the implant collar and the direction of applied force.
MATERIALS AND METHODS: The three-dimensional finite element method was selected to evaluate the stress distribution. CFPDs which was supported by microthread collar structured (MCS) and non-microthread collar structured (NMCS) implants was modeled; 300 N vertical, 150 N oblique and 60 N horizontal forces were applied to the models separately. The stress values in the bone, implant-abutment complex and superstructures were calculated.
RESULTS: In the MCS model, higher stresses were located in the cortical bone and implant-abutment complex in the case of vertical load while decreased stresses in cortical bone and implant-abutment complex were noted within horizontal and oblique loading. In the case of vertical load, decreased stresses have been noted in cancellous bone and framework. Upon horizontal and oblique loading, a MCS model had higher stress in cancellous bone and framework than the NMCS model. Higher von Mises stresses have been noted in veneering material for NMCS models.
CONCLUSION: It has been concluded that stress distribution in implant-supported CFPDs correlated with the macro design of the implant collar and the direction of applied force.
Предметные рубрики MeSH
AlloysAluminum SilicatesBiomechanical PhenomenaChromium AlloysComputer SimulationDental AbutmentsDental AlloysDental Implant-Abutment DesignDental ImplantsDental PorcelainDental Prosthesis DesignDental Prosthesis, Implant-SupportedDental VeneersDenture DesignDenture, Partial, FixedElastic ModulusFinite Element AnalysisHumansImaging, Three-DimensionalMandibleModels, BiologicalOsseointegrationPotassium CompoundsStress, MechanicalSurface PropertiesTitanium