title: Effect of macro-design of immediately loaded implants on micromotion and stress distribution in surrounding bone using finite element analysis.
abstract: OBJECTIVE
  Macro-design influences the initial stability of implant and reduces micromotions. The aim of this study was to determine and compare micromotions and stress distribution in the bone around immediately loaded Maestro and Xive implants using finite element analysis.
  
  
  METHODS
  In this experimental study, accurate, clear photos were prepared of Xive and Maestro implants 12 and 13 mm long and 4 and 3.8 mm in diameter, respectively, using a Nikon Digital Camera with a resolution 5.24-megapixels with 8x Optical Zoom and 4x Digital Zoom. After accurate measurements, 3-D models of the implants inside the lower mandible (D2) were processed in Solidworks Version 2003 environment and transferred into Ansys for finite element analysis. After loading of 500 N angled at 70 degrees from the horizontal plane, the micromotion of the implant and Von Misses stresses around the bone were measured.
  
  
  RESULTS
  The measured micromotion in Maestro implant was 148 mum and that in Xive was 284 mum. Stress distribution in the bone surrounding Maestro implant was better than Xive, but maximum stress surrounding Xive implants (30 MPa) was lower than Maestro (33 MPa).
  
  
  CONCLUSIONS
  Based on the results obtained in the present study, maximum micromotion in maestro was less than that in Xive implants. This finding can guarantee the application of maestro implants for immediate loading.
authors: Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors: Akbar
authors: A
authors: Fazel
authors: Shima
authors: S
authors: Aalai
authors: Mansour
authors: M
authors: Rismanchian
mesh_terms: D000539:Alveolar Process / Q000502:physiology*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis / Q000379:methods; D020342:Finite Element Analysis; D006801:Humans; D008954:Models, Biological; D003765:Models, Dental; D009068:Movement; D023861:Photography, Dental / Q000295:instrumentation
chemical_list: D015921:Dental Implants