Effect of Crown-to-Implant Ratio of Short Implants on Peri-Implant Stress: A Finite Element Analysis.

Purpose of this study was to evaluate the distribution of bone tension around single implants with different С/I ratio (1.5:1, 1.75:1, 2:1) according to the von Mises criterion. Stress analysis was performed using Invesalius 3.0, Rhinoceros 3D 4.0 software. Three 3D models of the mandibular segment of the bone block were developed: model A, a short implant (6 mm) C/I -1.5:1; model B, a short implant (6 mm) C/I -1.75:1; model C, a short implant (6 mm) C/I -2:1. The results were evaluated: the cumulative frequency of implant engraftment, MBL changes around the implant, follow up for 5 years. Under axial load, the highest stresses were concentrated at the abutment/implant junctions, the highest stresses were 67.94 MPa C/I -1.5:1, 68.09 MPa C/I -1.75:1 and 68.24 MPa C/ I -2:1, respectively. The results of the current study, indicate the increase in crown height showed little difference in load at the crown/implant interface with crown/implant ratios of 1.5:1, 1.75:1 and 2:1. In vivo finite element analysis (FEA) study showed that short implantats are successful regardless the C/I ratio. Use of shorts implants for prosthetic rehabilitation can be considered favorable and well substantiated.