Effect of archwire plane and archwire size on anterior teeth movement in sliding mechanics in customized labial orthodontics: a 3D finite element study

Abstract

Background The aim of this study was to evaluate anterior teeth movement with different archwire planes and archwire sizes during space closure with and without miniscrew in sliding mechanics. Methods A 3D finite element method was applied to simulate anterior teeth retraction with and without miniscrew and power arm. Initial displacements and pressure stresses of periodontal tissue in anterior teeth were calculated after the teeth were applied with retraction forces with different archwire planes and archwire sizes. Results High archwire plane showed better torque control of anterior teeth in both sliding mechanics. With intramaxillary retraction, anterior teeth showed lingual tipping and extrusion movement, whereas larger-size archwires did not reduce it. In miniscrew sliding mechanics, anterior teeth showed labial tipping and intrusion movement. Compared with intramaxillary retraction, the retraction force produced less pressure stress on periodontal tissue in miniscrew sliding mechanics with long power arm. Conclusions Higher archwire plane is conducive to anterior teeth torque control. In order to achieve the bodily movement of the anterior teeth during space closure, it is more important to choose the appropriate method (miniscrew sliding mechanics with long power arm), instead of increasing the size of the archwire.

Leveling the curve of Spee using different sized archwires: a randomized clinical trial of blood flow changes

“…Thirty subjects (20 degrees in groups 1, 2, and 3, respectively (P > 0.05). The participants' flowchart is presented in Fig.…”

“…However, the effect of using larger AW dimension with high frictional forces on pulp tissues during orthodontic treatment is not known yet. Furthermore, Wu et al [ 20 ] reported that the use of larger dimension AWs increased the pressure stresses on the PDL and alveolar bone which might add the risk of root resorption and irreversible pulp changes. Therefore, it was assumed that the type and size of the AW might have different impact on the BF during COS leveling with intrusive and extrusive forces.…”

“…Similarly, they demonstrated a short-term regressive change in BF during continuous molar intrusion with mini-implants, which tended to return to baseline values by the end of the observation period (6 months) [ 15 ]. Furthermore, Wu et al [ 20 ] reported that the use of larger dimension AW increased the pressure stresses on the periodontal ligament and the alveolar bone, which might add to the risk of root resorption and irreversible pulp changes.…”