Validation of an experimental polyurethane model for biomechanical studies on implant-supported prosthesis: compression tests

Abstract

ObjectivesThe complexity and heterogeneity of human bone, as well as ethical issues, most always hinder the performance of clinical trials. Thus, in vitro studies become an important source of information for the understanding of biomechanical events on implantsupported prostheses, although study results cannot be considered reliable unless validation studies are conducted. The purpose of this work was to validate an artificial experimental model based on its modulus of elasticity, to simulate the performance of human bone in vivo in biomechanical studies of implant-supported prostheses.Material and MethodsIn this study, fast-curing polyurethane (F16 polyurethane, Axson) was used to build 40 specimens that were divided into five groups. The following reagent ratios (part A/part B) were used: Group A (0.5/1.0), Group B (0.8/1.0), Group C (1.0/1.0), Group D (1.2/1.0), and Group E (1.5/1.0). A universal testing machine (Kratos model K – 2000 MP) was used to measure modulus of elasticity values by compression.ResultsMean modulus of elasticity values were: Group A – 389.72 MPa, Group B – 529.19 MPa, Group C – 571.11 MPa, Group D – 470.35 MPa, Group E – 437.36 MPa.ConclusionThe best mechanical characteristics and modulus of elasticity value comparable to that of human trabecular bone were obtained when A/B ratio was 1:1.

Validation of an experimental polyurethane model for biomechanical studies on implant supported prosthesis - tension tests

“…Moreover, fresh mandibular specimens have a natural viscosity that hinders the attachment of strain gauges. Because of these characteristics, the application of artificial test materials for in vitro biomechanical research has been reported in the literature 3 , 5 , 9 , 10 , 12 , 16 , 24 , 28 and mathematical models have been developed to simulate the bone remodeling process under mechanical stimulus in implant supported prosthesis 13 .…”

The effect of the mandibular plane angle on fracture line stability: An ex vivo experimental study

“…Polyurethane replicas have been used previously for this purpose. Their anatomical characteristics, isotropic properties, modulus of elasticity, and density have been claimed to be similar to those of the human mandible . However, they were not available for this study.…”

Biomechanics of Cantilevered Implant-Supported Prosthesis (Biomechanics in Implant Prosthodontics)

“…Therefore, studies have been conducted on simulated bone models. Polyurethane was found to present elastic modulus similar to human bone (Miyashiro et al, 2011;Moretti-Neto et al, 2011) and was chosen to verify the tension levels that are developed around implants during function (Figure 8) When prosthetic restorations were connected to the abutments, the tension levels on the bone located at the cervical area of the implant were very low, around 58 με to 100 με for single crowns and reaching 350 με to 400 με for multiple element restorations. What can be regarded as relevant in these studies is that the tension levels fall within physiologic limits, as proposed by Frost's minimal effective strain theory, between 50-200 με to 1500-2500 με.…”