Finite element analysis of the effect of power arm locations on tooth movement in extraction space closure with miniscrew anchorage in customized lingual orthodontic treatment

Effects of Skeletally Supported Anterior en Masse Retraction with Varied Lever Arm Lengths and Locations in Lingual Orthodontic Treatment: A 3D Finite Element Study

“…Furthermore, in a systemic review by Ata-Ali et al [ 20 ], treatment with lingual appliances tended to tip incisors by generating a lingual crown torque. Feng et al [ 8 ] conducted a 3D finite element study comparing two different lever arm locations with a single miniscrew position and concluded that lever arms located between the lateral incisor and canine can yield better anterior tooth torque control than lever arms located distal to the canine but still cannot achieve reasonable torque of the anterior maxillary teeth without additional torque control methods. In agreement with our findings, when the lever arm location was distal to the canine, the maxillary incisors and canines showed lingual crown tipping and labial root tipping, which increased as the length of the lever arm increased from 6 mm to 10 mm, with no difference between the 4.5 and 8 mm miniscrew heights.…”

“…En masse retraction of the six maxillary anterior teeth as one unit to close an extraction space is a standard clinical practice procedure. To control the anchorage in the posterior teeth, miniscrews can be used to achieve maximal retraction of the anterior teeth during lingual orthodontic treatment [ 8 ]. Variations in the direction of the applied retraction will result in multiple movement patterns of the anterior teeth, which may lead to unfavorable outcomes.…”

“…Variations in the direction of the applied retraction will result in multiple movement patterns of the anterior teeth, which may lead to unfavorable outcomes. Thus, it is crucial to understand the resultant effects of the different movement patterns during en masse retraction of the anterior maxillary teeth with the use of miniscrews in lingual orthodontics [ 8 ].…”

“…A previous study [ 8 ] investigated the movement tendencies of the maxillary anterior teeth during lingual en masse retraction with a single miniscrew height and two varied lever arm locations using the finite element method. Applying retraction force from different miniscrew heights could generate new movement patterns which could be favorable for function and esthetics.…”

Análisis biomecánico en la zona para-radicular de primer molar con y sin la aplicación de micro-osteoperforaciones en mandíbula. Estudio en Elementos Finitos.

“…( Fig. 2 b, d, f) Feng y col. (17) Hueso trabecular 1.4 0.3 Ozdemir Dogan (18) Hueso cortical perforación 11.1 0.3 Zang y col. (19) Hueso trabecular perforación 1.11 0.3 Zang y col. (19) Diente 20.3 0.3 Feng y col. (17) Brackets y banda 205 0.3 Feng y col. (17) Tabla 1: Propiedades mecánicas de los materiales.…”