title: Effect of surface treatment on stress distribution in immediately loaded dental implants--a 3D finite element analysis.
abstract: OBJECTIVE
  To investigate, by means of FE analysis, the effect of surface roughness treatments on the distribution of stresses at the bone-implant interface in immediately loaded mandibular implants.
  
  
  METHODS
  An accurate, high resolution, digital replica model of bone structure (cortical and trabecular components) supporting an implant was created using CT scan data and image processing software (Mimics 13.1; Materialize, Leuven, Belgium). An anatomically accurate 3D model of a mandibular-implant complex was created using a professional 3D-CAD modeller (SolidWorks, DassaultSystèmes Solid Works Corp; 2011). Finite element models were created with one of the four roughness treatments on the implant fixture surface. Of these, three were surface treated to create a uniform coating determined by the coefficient of friction (μ); these were either (1) plasma sprayed or porous-beaded (μ=1.0), (2) sandblasted (μ=0.68) or (3) polished (μ=0.4). The fourth implant had a novel two-part surface roughness consisting of a coronal polished component (μ=0.4) interfacing with the cortical bone, and a body plasma treated surface component (μ=1) interfacing with the trabecular bone. Finite element stress analysis was carried out under vertical and lateral forces.
  
  
  RESULTS
  This investigation showed that the type of surface treatment on the implant fixture affects the stress at the bone-implant interface of an immediately loaded implant complex. Von Mises stress data showed that the two-part surface treatment created the better stress distribution at the implant-bone interface.
  
  
  CONCLUSIONS
  The results from this FE computational analysis suggest that the proposed two-part surface treatment for IL implants creates lower stresses than single uniform treatments at the bone-implant interface, which might decrease peri-implant bone loss. Future investigations should focus on mechanical and clinical validation of these FE results.
authors.affiliation: Division of Biomechanics, Department of Mechanical Engineering, Sahand University of Technology, Tabriz, Iran.
authors.forename: Babak
authors.initials: B
authors.lastname: Bahrami
authors.affiliation: The University of Sheffield, Academic Unit of Restorative Dentistry, The School of Clinical Dentistry, Claremont Crescent, Sheffield, UK. Electronic address: s.shahrbaf@sheffield.ac.uk.
authors.forename: Shirin
authors.initials: S
authors.lastname: Shahrbaf
authors.affiliation: Tabriz University of Medical Sciences, Tabriz Dental School, Orthodontic Department, Tabriz, Iran.
authors.forename: Behnam
authors.initials: B
authors.lastname: Mirzakouchaki
authors.affiliation: Division of Biomechanics, Department of Mechanical Engineering, Sahand University of Technology, Tabriz, Iran.
authors.forename: Farzan
authors.initials: F
authors.lastname: Ghalichi
authors.affiliation: Division of Biomechanics, Department of Mechanical Engineering, Sahand University of Technology, Tabriz, Iran.
authors.forename: Mohammed
authors.initials: M
authors.lastname: Ashtiani
authors.affiliation: The University of Sheffield, Academic Unit of Restorative Dentistry, The School of Clinical Dentistry, Claremont Crescent, Sheffield, UK.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Martin
mesh_terms: D017076:Computer-Aided Design; D015921:Dental Implants; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D057893:Immediate Dental Implant Loading; D008334:Mandible; D012984:Software; D013499:Surface Properties; D014057:Tomography, X-Ray Computed
chemical_list: D015921:Dental Implants
keywords: CT-scan; FEA; Implant; Lateral load; Maximum principal stress; Mimics; Solidwork; Surface treatment; von-Mises stress