J P Macedo1, J Pereira2, J Faria3, C A Pereira4, J L Alves3, B Henriques5, J C M Souza6, J López-López7. 1. School of Dentistry, Division of Oral Implantology, Universidade Fernando Pessoa (UFP), Porto, Portugal. Electronic address: jmacedo@ufp.edu.pt. 2. School of Dentistry, Division of Oral Implantology, Universidade Fernando Pessoa (UFP), Porto, Portugal; Department of odontostomatology, Faculty of Medicine and Health Sciences (Dentistry), University of Barcelona, Spain. 3. Center for Microelectromechanical Systems (CMEMS-UMinho), University of Minho, Campus Azurém, 4800-058 Guimarães, Portugal. 4. Department of odontostomatology, Faculty of Medicine and Health Sciences (Dentistry), University of Barcelona, Spain. 5. Center for Microelectromechanical Systems (CMEMS-UMinho), University of Minho, Campus Azurém, 4800-058 Guimarães, Portugal; Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Campus Trindade, Florianópolis, SC, Brazil. Electronic address: brunohenriques@dem.uminho.pt. 6. Center for Microelectromechanical Systems (CMEMS-UMinho), University of Minho, Campus Azurém, 4800-058 Guimarães, Portugal; Ceramic and Composite Materials Research Group (CERMAT), Federal University of Santa Catarina (UFSC), Campus Trindade, Florianópolis, SC, Brazil. 7. Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, University of Barcelona, L'Hospitalet de Llobregat, 08907 Barcelona, Spain. Electronic address: 18575jll@gmail.com.
Abstract
PURPOSE: The purpose of the present study was to evaluate the distribution of stresses and consequent bone volume affected surrounding external hexagon or Morse taper dental implant systems by finite element analysis. MATERIAL AND METHODS: Two different dental implant-abutment designs were assessed: external hexagon or Morse taper joints. A mandibular bone model obtained from a computed tomography scan was used. The implant-abutment systems were axially or obliquely (45°) loaded on 150 N relatively to the central axis of the implant. The von Mises stresses were analysed in terms of magnitude and volume of affected surrounding bone. RESULTS: The von Mises equivalent values found on the cortical bone were higher than that recorded on the trabecular bone. Additionally, the bone volume associated with high stress values was higher in cortical and trabecular bone for oblique loading compared to axial loading. The values of von Mises equivalent stress around Morse taper implant-abutment system were lower on both axial and oblique loads than those recorded for external hexagon implant-abutment systems. CONCLUSIONS: Morse taper implant joints revealed a proper biomechanical behavior when compared to external hexagon systems concerning a significant volume of surrounding peri-implant bone subjected to lower stresses values.
PURPOSE: The purpose of the present study was to evaluate the distribution of stresses and consequent bone volume affected surrounding external hexagon or Morse taper dental implant systems by finite element analysis. MATERIAL AND METHODS: Two different dental implant-abutment designs were assessed: external hexagon or Morse taper joints. A mandibular bone model obtained from a computed tomography scan was used. The implant-abutment systems were axially or obliquely (45°) loaded on 150 N relatively to the central axis of the implant. The von Mises stresses were analysed in terms of magnitude and volume of affected surrounding bone. RESULTS: The von Mises equivalent values found on the cortical bone were higher than that recorded on the trabecular bone. Additionally, the bone volume associated with high stress values was higher in cortical and trabecular bone for oblique loading compared to axial loading. The values of von Mises equivalent stress around Morse taper implant-abutment system were lower on both axial and oblique loads than those recorded for external hexagon implant-abutment systems. CONCLUSIONS: Morse taper implant joints revealed a proper biomechanical behavior when compared to external hexagon systems concerning a significant volume of surrounding peri-implant bone subjected to lower stresses values.