Effect of bone-borne rapid maxillary expanders with and without surgical assistance on the craniofacial structures using finite element analysis
Document Type
Article
Publication Title
American Journal of Orthodontics and Dentofacial Orthopedics
Abstract
Introduction The aim of this study was to analyze stress distribution and displacement of the craniofacial structures resulting from bone-borne rapid maxillary expanders with and without surgical assistance using finite element analysis. Methods Five designs of rapid maxillary expanders were made: a tooth-borne hyrax expander (type A); a bone-borne expander (type B); and 3 bone-borne surgically assisted modalities: separation of the midpalatal suture (type C), added separation of the pterygomaxillary sutures (type D), and added LeFort I corticotomy (type E). The geometric nonlinear theory was applied to evaluate the Von Mises stress distribution and displacement. Results The surgical types C, D, and E demonstrated more transverse movement than did the nonsurgical types A and B. The amounts of expansion were greater in the posterior teeth in types A and B, but in types C, D, and E, the amounts of expansion were greater in the anterior teeth. At the midpalatal suture, the nonsurgical types showed more anterior expansion than did the posterior region, and higher stresses than with the surgical types. Type B showed the highest stresses at the infraorbital margin, anterior and posterior nasal spines, maxillary tuberosity, and pterygoid plate and hamulus. Conclusions The 3 surgical models showed similar amounts of stress and displacement along the teeth, midpalatal sutures, and craniofacial sutures. Therefore, when using a bone-borne rapid maxillary expander in an adult, it is recommended to assist it with midpalatal suture separation, which requires minimal surgical intervention. Copyright © 2014 by the American Association of Orthodontists.
First Page
638
Last Page
648
DOI
10.1016/j.ajodo.2013.12.029
Publication Date
1-1-2014
Recommended Citation
Lee, Seong Cheon; Park, Jae Hyun; Bayome, Mohamed; Kim, Ki Beom; Araujo, Eustaquio A.; and Kook, Yoon Ah, "Effect of bone-borne rapid maxillary expanders with and without surgical assistance on the craniofacial structures using finite element analysis" (2014). ASDOH Faculty Publications. 78.
https://scholarworks.atsu.edu/asdoh-faculty/78