Article information
Year 2018 Volume 68 Issue 4 Page 413-419
Title:
Effect of Corticotomy Patterns on the Center of Resistance Location of the Upper Six Anterior Teeth During En Masse Retraction: Finite Element Analysis
Keyword(s):
Center of resistance, Corticotomy pattern, En masse retraction, Finite element analysis
Abstract:
To determine the center of resistance location of six maxillary anterior teeth during en masse retraction
after combination with different corticotomy patterns. Five finite element models were constructed from CBCT.
Standard brackets were passively positioned on maxillary anterior teeth at the center in mesiodistal dimension and
3 mm vertically from the cusp tip. The power arm was set mesial to the canine bracket and the mini-implant was
placed between the upper second premolar and the first molar. Five decorticated bone patterns were created,
the patterns started at 1 mm above the crest of the alveolar bone of the upper first premolar to central incisor areas.
The upper anterior teeth were retracted from the power arm to the mini-implant. The center of the resistance
location was determined by varying the force locations parallel to the occlusal plane until bodily movement of the
upper anterior teeth was obtained. The center of resistance in all models was located at the same 10.8 mm distance
apically from the middle of the bracket slot in the mesiodistal dimension or 13.8 mm apically from the incisal edge.
Different corticotomy patterns did not change the center of resistance location of the upper anterior teeth in en
masse retraction.