Stress distribution and displacement by different bone-borne palatal expanders with micro-implants: a three-dimensional finite-element analysis

The aim of this study was to analyze stress distribution and displacement of the maxilla and teeth according to different designs of bone-borne palatal expanders using micro-implants. A three-dimensional (3D) finite-element (FE) model of the craniofacial bones and maxillary teeth was obtained. Four...

Full description

Saved in:
Bibliographic Details
Published in:European journal of orthodontics 2014-10, Vol.36 (5), p.531-540
Main Authors: Lee, Hye Kyung, Bayome, Mohamed, Ahn, Chee Soo, Kim, Seong-Hun, Kim, Ki Beom, Mo, Sung-Seo, Kook, Yoon-Ah
Format: Article
Language:English
Subjects:
Alveolar Process - pathology
Biomechanical Phenomena
Computer Simulation
Dental Implants
Dentistry
Facial Bones - pathology
Finite Element Analysis
Humans
Imaging, Three-Dimensional - methods
Incisor - pathology
Maxilla - surgery
Miniaturization
Models, Biological
Molar - pathology
Orthodontic Anchorage Procedures - instrumentation
Orthodontic Appliance Design
Palatal Expansion Technique - instrumentation
Palate - surgery
Rotation
Stress, Mechanical
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The aim of this study was to analyze stress distribution and displacement of the maxilla and teeth according to different designs of bone-borne palatal expanders using micro-implants. A three-dimensional (3D) finite-element (FE) model of the craniofacial bones and maxillary teeth was obtained. Four designs of rapid maxillary expanders: one with micro-implants placed lateral to mid-palatal suture (type 1), the second at the palatal slope (type 2), the third as in type 1 with additional conventional Hyrax arms (type 3), and the fourth surgically assisted tooth-borne expander (type 4) were added to the FE models. Expanders were activated transversely for 0.25mm. Geometric nonlinear theory was applied to evaluate Von-Mises Stress distribution and displacement. All types exhibited downward displacement and demonstrated more horizontal movement in the posterior area. Type 3 showed the most transverse displacement. The rotational movement of dentoalveolar unit was larger in types 1 and 3, whereas it was relatively parallel in types 2 and 4. The stresses were concentrated around the micro-implants in types 1 and 3 only. Type 2 had the least stress concentrations around the anchorage and showed alveolar expansion without buccal inclination. It is recommended to apply temporary anchorage devices to the palatal slopes to support expanders for efficient treatment of maxillary transverse deficiency.
ISSN:0141-5387
1460-2210
DOI:10.1093/ejo/cjs063