Stress and displacement of mini-implants and appliance in Mini-implant Assisted Rapid Palatal Expansion: analysis by finite element method

Stress and displacement of mini-implants and appliance in Mini-implant Assisted Rapid Palatal Expansion: analysis by finite element method

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ABSTRACT Objective: In this study, simulations were performed by the finite element method (FEM) to determine the tension and displacement Ring Holder in mini-implants and in expander appliance during rapid maxillary expansion, by varying the number and location of the mini-implants.Methods: For the computational simulation, a three-dimensional mesh was used for the maxilla, mini-implants and expander appliance.Comparisons were made on six different Mini-implant Assisted Rapid Palatal Expander (MARPE) configurations, by varying the amount and location of mini-implants.

A closed suture was design and received two activations of 0.25 mm, and an open suture had a 0.5-mm aperture that received 20 activations, also of 0.

25 mm.Results: For the closed suture, the maximum displacement values in the mini-implants were between 0.253 and 0.

280 mm, and stress was between 1,348.9 and 2,948.2 MPa; in the expander appliance, the displacement values were between 0.

256 and 0.281 mm, and stress was between 738.52 and 1,207.

6 MPa.For the open suture, the maximum displacement values in the mini-implants were between 2.57 and 2.

79 mm, and stress was between 5,765.3 and 10,366 MPa; in the appliance, the maximum displacements was between 2.53 and 2.

89 mm, and stress was between 4,859.7 and 9,157.4 MPa.

Conclusions: There were higher stress concentrations in the mini-implant than in the expander arm.In the simulations with a configuration of three mini-implants, stress overload was observed in the isolated mini-implant.Displacements of the mini-implants and arms of the Theanine appliance were similar in all simulations.