Three-Dimensional Finite Element Analysis of Mandibular Overdentures Supported by Mini-Implants
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This study examined the effect of using two anterior denture-supporting mini implants (mIMP2) compared to four (two anterior and two posterior) denture-supporting mini-implants (mIMP4) on the stress experienced by the mini-implants and the strain experienced by the peri-implant and analogous posterior bone. The stress and strain values were also compared to known values of strength for the mini-implants and physiologic strain values. Finite element modeling was used to study the effects. Two models were created identically, with the exception of the number of denture-supporting mini-implants used, and contained modeled mucosa, cortical bone, cancellous bone, and the mini-implants. The models were loaded over one second with three 70N loads bilaterally and results with collected using a PostView program. The anterior mini-implants in both models showed stresses that would not put them at risk for fracture. The posterior mini-implants in mIMP4 experienced stresses above their yield point, indicating that they could be at risk for fracture. Strain in the peri-implant bone anteriorly and the posterior bone in mIMP2 was in the physiologic range. The posterior peri implant bone in mIMP4 showed strains that were above physiologic, which indicates this region could be at risk for bone resorption. Based on the limitations of this study, posterior mini-implants and posterior peri implant bone could be at risk for fracture and pathologic resorption. Dentists must weigh the risks and benefits of using mini-implants to support overdentures in each clinical case to determine if the treatment could be successful in light of the potential negative consequences.
Table of Contents
Introduction -- Materials and methods -- Results -- Discussion -- Conclusions.