Does the center of resistance depend on the direction of tooth movement?
BACKGROUND
The objective of this study was to compare the locations of the centers of resistance (CRes) in the buccolingual (BL) and mesiodistal (MD) directions of the mandibular central incisors of 6 dogs.


METHODS
Based on microcomputed tomography images of the teeth and their supporting tissues, solid models were used to build finite element models.


RESULTS
The CRes locations for the 6 specimens were determined for displacements in the BL and MD directions with finite element calculations. Measured from the alveolar crest, the BL and MD locations were 43% to 51% and 31% to 43% of root length, respectively. Their average locations, 46.2% and 38.3%, were statistically different at the 95% CI.


CONCLUSIONS
The CRes location for BL tooth movement is significantly more apical than its MD counterpart.
Meyer
Brandon N
BN
Department of Mechanical Engineering and Department of Orthodontics and Oral Facial Genetics, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, USA.
Chen
Jie
J
Katona
Thomas R
TR
D000818:Animals; D001696:Biomechanical Phenomena; D003799:Dental Stress Analysis / Q000379:methods; D004285:Dogs; D055119:Elastic Modulus; D020342:Finite Element Analysis; D007180:Incisor / Q000502:physiology; D008334:Mandible; D010513:Periodontal Ligament / Q000502:physiology*; D012399:Rotation; D014087:Tooth Movement Techniques; D014092:Tooth Root / Q000502:physiology*; D055114:X-Ray Microtomography