title: Analysis of a force system for upper molar distalization using a trans-palatal arch and mini-implant: a finite element analysis study.
abstract: The purpose of this study was to analyse distal movements of molars in a force system using a trans-palatal arch (TPA), fixed to the maxillary first molar, and mini-implants placed at the palatal midline, considering the diagnostic standard for placement site in association with variation in upper molar locations, using finite element (FE) analysis. Three-dimensional FE models, divided by the differing direction of traction force, mesiodistal locations of the left and right molars, and the lateral location of the mini-implant were constructed. (1) When a traction force was fixed from the height of alveolar crest to the mini-implant placed at the middle of palate, the molars underwent bodily movement. (2) When the location of the mini-implant was moved to the left of the midline, the amount of distal movement of the left molar increased. When the mesiodistal locations of the left and right molars differed, the amount of distal movement of the molar located mesially was larger than that of the contralateral molar, even when the mini-implant was located on the midline.
authors.affiliation: Department of Orthodontics and.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Ueno
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Motoyoshi
authors.forename: Kotoe
authors.initials: K
authors.lastname: Mayahara
authors.forename: Yoko
authors.initials: Y
authors.lastname: Saito
authors.forename: Yuko
authors.initials: Y
authors.lastname: Akiyama
authors.forename: Seil
authors.initials: S
authors.lastname: Son
authors.forename: Noriyoshi
authors.initials: N
authors.lastname: Shimizu
mesh_terms: D015921:Dental Implants; D020342:Finite Element Analysis; D006801:Humans; D008437:Maxilla / Q000601:surgery; D008963:Molar; D016382:Orthodontic Appliance Design; D010159:Palate / Q000601:surgery; D014087:Tooth Movement Techniques / Q000379:methods*
chemical_list: D015921:Dental Implants