Research of Maxillary Impacted Canine in Orthodontic Treatment Based on Nanoindentation Experiments

Abstract

This study selected the maxillary labial impacted canine as the research object to build the model of periodontal ligament (PDL) and simulate the process of orthodontic treatment. This paper obtained stress–strain curve by calculating and analyzing the data of nanoindentation experiments. The parameters were identified through curve fittings by ABAQUS. The fitting results show that the third-order Ogden model is in good agreement with the experimental data which demonstrate that the third-order Ogden model is able to reflect the material properties of the PDL. In this paper, orthodontic process of the maxillary labial impacted canine was simulated. The results show that inside and outside surfaces of PDL all have stress variation, the stress on the root apex and dental cervix of PDL is relatively large, the maximum appears at dental cervix and the minimum appears close to tooth impedance center.

An in vivo evaluation of clear aligners for optimal orthodontic force and movement to determine high-efficacy and periodontal-friendly aligner staging

“…The value of the preconditioning cycle was selected based on the repeatability of the mechanical response of the PDL. The specimens were subjected to a compressive force vertically to the dentin surface at a loading speed of 0.1 mN/s [ 26 ]. Then unloaded stress at the reduction rate of 0.25 mN/s until the indenter left the surface.…”