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Analysis of mandibular movements and chewing cycles in patients with Skeletal Class III: a preliminary study using 3D electromagnetic articulography

Ramón Fuentes, Constanza Farfán, Fernando J. Dias, Alain Arias, María Florencia Lezcano


Background. Study of mandibular movements (MM) was introduced into oral physiology
to increase knowledge of the stomatognathic system and achieve better results in
treatments. Electromagnetic Articulography (EMA), specifically the most recent
equipment, AG501, plays an important role in these objectives, since it permits description
of movements in 3 dimensions by recording the position of body parts at a high sampling
frequency. Aim. The aim of the present study was to report an exploratory analysis of the
geometrical characteristics (area, trajectory, ranges) and the velocity of border and
functional MM in patients with Skeletal Class III by the use of EMA AG501. Material and
methods. Two individuals with skeletal class III, patients at the Dental Teaching Clinic of
the Dental Faculty of Universidad de La Frontera, Chile, were assessed and the results were
processed with computer scripts developed specifically for this study. Results. The result
produced from border MM was Posselt's envelope in the frontal and sagittal planes,
allowing analysis of the morphology and area. The result obtained from the mastication
movements was an assessment of the area of each chewing cycle, which was compared
with the area of the envelopes in the various planes. We also analysed the number,
frequency and velocity of cycles, comparing them with available data.

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