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Chin J Dent Res. 2016 Jun;19(2):95-101. doi: 10.3290/j.cjdr.a36179.

Asymmetric Head Gear: A Comparison between Unilateral Outer Bow Expansion and Unilateral Outer Bow Shortening - an Energy Approach using the Finite Element Method.

Abstract

OBJECTIVE:

To compare the influence of outer bow length difference and unilateral outer bow expansion on the 'asymmetric effect' of the headgear.

METHODS:

Twelve 3D finite element models of a headgear with two tubes were designed, which were similar except for the outer bow length or the degree of unilateral expansion in Solid-Works 2011. A 3N force was applied to the outer bow ends in ANSYS Workbench 12.1 and the distalising, lateral forces to molars, moments and the energy of the system were evaluated.

RESULTS:

As the degree of unilateral expansion increased, the net differences in all findings were increased up to a point, and then changed. There was an increasing pattern in the length difference group. Buccal movement was observed in the intact/shorter side molar.

CONCLUSION:

Unilateral shortened outer bow asymmetric headgears are more efficient and more predictable in clinical application than the unilateral outer bow expansion.

PMID:
27379347
DOI:
10.3290/j.cjdr.a36179
[Indexed for MEDLINE]
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