3-dimensional finite element analysis of the outcomes of Alexander, Gianelly, Roth and MBT bracket prescription

Int Orthod. 2019 Mar;17(1):45-52. doi: 10.1016/j.ortho.2019.01.010. Epub 2019 Feb 14.

Abstract

The purpose of this study was to compare the effect of a 4-bracket system including Alexander, Roth, MBT (Maxillary Transverse Bioadaptation), and Gianelly on the upper anterior tooth movement in sliding mechanics with the help of a 3-Dimensional (3D) Finite Element Method.

Methods: Displacement, stress, strain, centre of rotation and resistance on the incise edge and apex of the maxillary central incisor were calculated when 100, 200, 300, 400grams of retraction force were applied.

Results: The amount of incise edge displacement was 2.609×10-4mm 2.682×10-4mm 2.875×10-4mm and 2.881×10-4mm in Alexander, Gianelly, Roth and MBT respectively with 100gr of retraction force. The value of apex root movement was 3.485×10-4mm 3.547×10-4mm 3.852×10-4mm and 3.864×10-4mm in Alexander, Gianelly, Roth and MBT respectively with 400g of retraction force.

Conclusions: The MBT system had the maximum apex root and incisal edge movement in all 100, 200, 300, 400grams of retraction force. The Alexander system had the lowest apex and incisal edge movement in all retraction forces.

Keywords: Analyse par éléments finis; Attaches orthodontiques; Finite element analysis; Orthodontic brackets; Torque.

MeSH terms

  • Biomechanical Phenomena
  • Finite Element Analysis
  • Humans
  • Image Processing, Computer-Assisted / methods*
  • Imaging, Three-Dimensional / methods*
  • Incisor
  • Maxilla
  • Mechanical Phenomena
  • Orthodontic Anchorage Procedures / instrumentation
  • Orthodontic Anchorage Procedures / methods*
  • Orthodontic Appliance Design
  • Orthodontic Brackets*
  • Orthodontic Wires
  • Periodontal Ligament
  • Stress, Mechanical
  • Tooth Crown / pathology
  • Tooth Movement Techniques / instrumentation
  • Tooth Movement Techniques / methods*
  • Torque