PMID: 22332554Feb 16, 2012Paper

Biomechanical study of "mandible-temporomandibular joint" under different loading angles with forsus

Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition
Lihua LiNa Li

Abstract

To identify the best loading angle with Forsus for mandible-temporomandibular joint. The changes in stress, displacement and rotation of "mandible-temporomandibular joint" were tested under -30 degrees, -15 degrees, 0 degrees, 15 degrees and 25 degrees of loading angles using a primary three dimensional finite element model. From 0 degrees to 25 degrees, with the increases of loading angles the displacement gradually increased. The maximum displacement occurred at chin, with 1.692 mm, 3.456 mm and 4.630 mm displacement under 0 degrees, 15 degrees and 25 degrees respectively. The maximum displacement occurred at the alveolar ridge under -15 degrees loading, which was 0.069 mm. No special stress concentration region was identified. The displacements from infradentale to pogonion gradually increased under all conditions except for the -15 degrees loading. With the loading angles deviated from the baseline farther, the porrect displacements of chin and the counterclockwise rotation became more obvious. The loading angles of Forsus appliance should be controlled between 0 degrees and 25 degrees.

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