Kinesiographic analysis of lateral excursive movement on the horizontal plane: the retrusive component

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Kinesiographic analysis of lateral excursive movement on the horizontal plane: the retrusive component

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Relation between the interincisal point movement and the working condyle movement. (Image: Drs. Andrea Papini, Gianfranco Cesaretti & Patrizia De Fabianis; JOSR 1/17)
Drs. Andrea Papini, Gianfranco Cesaretti & Patrizia De Fabianis

By Drs. Andrea Papini, Gianfranco Cesaretti & Patrizia De Fabianis

Sun. 9. April 2017

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The temporomandibular joint (TMJ) has a functionally complex articulation that during phylogeny underwent an adaptation also linked to posture change after the acquisition of upright posture and subsequent reduction of the postglenoid process. This articulation supports numerous functions of the stomatognathic apparatus, and the part physiologically designed to withstand greater loads associated with mastication is essentially the frontal one; the rear portion of the TMJ is unfit to absorb retrusive forces owing to the poor support of the thin bone component and the histological characteristics of the tissue component. The purpose of this article was to analyze the angles of lateral tracings both on the frontal plane and on the horizontal one through kinesiographic analysis (functional masticatory angle of Planas and functional horizontal masticatory angle) in seeking to observe their mutual relations with respect to those planes.

Materials and methods
The study was performed on 115 patients who presented with asymmetrical laterality movements. The sample was made up of 32 males and 85 females aged between 17 and 84.

Results
Ninety-eight (85%) of the lateral tracings examined showed a consistency between the inclination of the tracings on the frontal and horizontal planes. Seventeen (15%) showed an inconsistency between the inclination of the tracings on the horizontal and frontal planes.

Conclusion
The study found a correspondence on the working side between a steep laterality on the frontal plane and a posterior trajectory on the horizontal plane. The reduction of the steepness of the functional masticatory angle of Planas tends to reduce the posteriorization of the functional horizontal masticatory angle, promoting the recovery of alternating unilateral masticatory function.

Editorial note: The full article was published in the 1/2017 issue of the Journal of Oral Science and Rehabilitation. It can be accessed free of charge at www.dtscience.com.

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