title: Validation of an experimental polyurethane model for biomechanical studies on implant supported prosthesis--tension tests.
abstract: OBJECTIVE
  The complexity and heterogeneity of human bone, as well as ethical issues, frequently hinder the development of clinical trials. The purpose of this in vitro study was to determine the modulus of elasticity of a polyurethane isotropic experimental model via tension tests, comparing the results to those reported in the literature for mandibular bone, in order to validate the use of such a model in lieu of mandibular bone in biomechanical studies.
  
  
  METHODS
  Forty-five polyurethane test specimens were divided into 3 groups of 15 specimens each, according to the ratio (A/B) of polyurethane reagents (PU-1: 1/0.5, PU-2: 1/1, PU-3: 1/1.5).
  
  
  RESULTS
  Tension tests were performed in each experimental group and the modulus of elasticity values found were 192.98 MPa (SD=57.20) for PU-1, 347.90 MPa (SD=109.54) for PU-2 and 304.64 MPa (SD=25.48) for PU-3.
  
  
  CONCLUSIONS
  The concentration of choice for building the experimental model was 1/1.
authors.affiliation: Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
authors.forename: Mariane
authors.initials: M
authors.lastname: Miyashiro
authors.forename: Valdey
authors.initials: V
authors.lastname: Suedam
authors.forename: Rafael Tobias
authors.initials: RT
authors.lastname: Moretti Neto
authors.forename: Paulo Martins
authors.initials: PM
authors.lastname: Ferreira
authors.forename: José Henrique
authors.initials: JH
authors.lastname: Rubo
mesh_terms: D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported / Q000379:methods*; D055119:Elastic Modulus; D006801:Humans; D008422:Materials Testing; D008962:Models, Theoretical; D011140:Polyurethanes / Q000737:chemistry*; D013718:Tensile Strength
chemical_list: D015921:Dental Implants; D011140:Polyurethanes