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Quintessence Publishing: Journals: ORTHODONTICS
The Art and Practice of Dentofacial Enhancement

Formerly World Journal of Orthodontics

Edited by
Rafi Romano, DMD, MSc (Editor-in-Chief)

ISSN 2160-2999 (print) / ISSN 2160-3006 (online)

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Winter 2011
Volume 12 , Issue 4

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Evaluation of the power arm in bringing about bodily movement using finite element analysis

Tariq Ajaz Ansari, BDS, MDS/Rohan Mascarenhas, BDS, MDS/Akhter Husain, BDS, MDS/Mohammed Salim, BDS, MDS

Pages: 318–329
PMID: 22299105

Aim: To evaluate the effectiveness of the power arm in bringing about bodily movement and to determine the ideal length and location of the power arm. Methods: A geometric model of the maxillary right canine was constructed and subsequently converted to a finite element model. Material property data were represented, boundary conditions were defined, and force was applied. Different situations were simulated in which a power arm of varying vertical lengths were attached at different locations on the tooth—namely, the incisal, middle, and cervical thirds. Results: The amount of bodily movement is maximum when the force is delivered directly at the cervical third. It decreases at the middle third and is least when attached at incisal third. The varying lengths of the power arm for a particular site of attachment does not bring about any change in the movement. Conclusion: The attachment of the power arm at the cervical third brought about maximum bodily movement, followed by the middle and incisal thirds. Variations in length of the power arm at different sites of attachment did not bring any change in the outcome. Thus, the point of attachment is critical in bringing about bodily movement. ORTHODONTICS (CHIC) 2011;12:318–329.

Key words: bodily movement, finite element analysis, power arm

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