Please use this identifier to cite or link to this item: https://repositorio.ufrn.br/jspui/handle/123456789/23799
Title: Influence of microthreads and platform switching on stress distribution in bone using angled abutments
Authors: Ferraz, Cacilda Cunha
Anchieta, Rodolfo Bruniera
Almeida, Erika Oliveira de
Freitas Junior, Amilcar Chagas
Ferraz, Fábio Cunha
Machado, Lucas Silveira
Keywords: Finite element;Dental implants;Stress;Platform switching;Microthreads
Issue Date: 2012
Publisher: ELSEVIER
Citation: FERRAZ, Cacilda Cunha et al. Influence of microthreads and platform switching on stress distribution in bone using angled abutments. Journal of Prosthodontic Research, v. 56, n. 4, p. 256-263, 2012.
Portuguese Abstract: To evaluate the stress distribution in peri-implant bone by simulating the effect of an implant with microthreads and platform switching on angled abutments through tridimensional finite element analysis. The postulated hypothesis was that the presence of microthreads and platform switching would reduce the stress concentration in the cortical bone. Methods Four mathematical models of a central incisor supported by an implant (5.0 mm × 13 mm) were created in which the type of thread surface in the neck portion (microthreaded or smooth) and the diameter of the angled abutment connection (5.0 and 4.1 mm) were varied. These models included the RM (regular platform and microthreads), the RS (regular platform and smooth neck surface), the SM (platform switching and microthreads), and the SS (platform switching and smooth neck). The analysis was performed using ANSYS Workbench 10.0 (Swanson Analysis System). An oblique load (100 N) was applied to the palatine surface of the central incisor. The bone/implant interface was considered to be perfectly integrated. Values for the maximum (σmax) and minimum (σmin) principal stress, the equivalent von Mises stress (σvM), and the maximum principal elastic strain (ɛmax) for cortical and trabecular bone were obtained. Results For the cortical bone, the highest σmax (MPa) were observed for the RM (55.1), the RS (51.0), the SM (49.5), and the SS (44.8) models. The highest σvM (MPa) were found for the RM (45.4), the SM (42.1), the RS (38.7), and the SS models (37). The highest values for σmin were found for the RM, SM, RS and SS models. For the trabecular bone, the highest σmax values (MPa) were observed in the RS model (6.55), followed by the RM (6.37), SS (5.6), and SM (5.2) models. Conclusion The hypothesis that the presence of microthreads and a switching platform would reduce the stress concentration in the cortical bone was partially rejected, mainly because the microthreads increased the stress concentration in cortical bone. Only platform switching reduced the stress in cortical bone.
URI: https://repositorio.ufrn.br/jspui/handle/123456789/23799
Appears in Collections:CCS - DOD - Artigos publicados em periódicos

Files in This Item:
File Description SizeFormat 
Influence of microthreads and platform switching on stress_2012.pdfhttp://www.sciencedirect.com/science/article/pii/S188319581200031X783.81 kBAdobe PDFThumbnail
View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.