Korean J Orthod.  2017 Sep;47(5):289-297. 10.4041/kjod.2017.47.5.289.

Biomechanical analysis of distalization of mandibular molars by placing a mini-plate: A finite element study

• Park M
• Na Y
• Park M
• Ahn J

• KMID: 2389144
• DOI: http://doi.org/10.4041/kjod.2017.47.5.289

Abstract

OBJECTIVE
The objective of this study was to analyze the patterns of tooth movements when distalization of mandibular molars using a mini-plate took place. A finite element analysis was applied to analyze patterns of tooth movements.
METHODS
The model of the mandible and teeth were used to build a finite element analysis model, and a mini-plate was inserted in the mandibular ramus. Two different orthodontic forces were established for displacement of mandibular molars. Orthodontic forces were applied at the level of the bracket and at the level of the cemento-enamel junction in the mandibular canine respectively.
RESULTS
orthodontic forces at the level of the cemento-enamel junction resulted in a greater biomechanical bodily movement in distalization of the mandibular molars compared to when the orthodontic forces were applied at the level of the bracket. Applying orthodontic forces to the cemento-enamel junction also resulted in unwanted greater extrusive movements in distalization of the mandibular molars compared to the bracket level.
CONCLUSIONS
With considering the mode of orthodontic teeth movement, applying different vertical orthodontic forces for distalization of mandibular molars can lead to more effective distalization of teeth.

Keyword

Finite element analysis; Distalization; Mandibular molars; Mini-plate

MeSH Terms

Finite Element Analysis
Mandible
Molar*
Tooth
Tooth Movement