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Journal of Oral Science & Rehabilitation No. 1, 2017

K i n e s i o g r a p h i c a n a l y s i s Kinesiographic analysis of lateral excursive movement on the horizontal plane: the retrusive component Andrea Papini,a Gianfranco Cesarettib & Patrizia De Fabianisc a Private practice in Prato, Italy b ARDEC Academy, Rimini, Italy c Turin University, Turin, Italy C o r r e s p o n d i n g a u t h o r : Dr. Gianfranco Cesaretti Via Maria Montessori 9 60022 Castelfidardo AN Italy T +39 071 782 2800 giancesa55@gmail.com H o w t o c i t e t h i s a r t i c l e : Papini A, Cesaretti G, De Fabianis P. Kinesiographic analysis of lateral excursive movement on the horizontal plane: the retrusive component. J Oral Science Rehabilitation. 2017 Mar;3(1):60–7. Abstract O b j e c t i v e 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 masticato- ry angle of Planas and functional horizontal masticatory angle) in seeking to observe their mutual relations with respect to those planes. M a t e r i a l s a n d m e t h o d s The study was performed on 115 patients who presented with asymmet- rical laterality movements. The sample was made up of 32 males and 85 females aged between 17 and 84. R e s u l t s Ninety-eight (85%) of the lateral tracings examined showed a consis- tency between the inclination of the tracings on the frontal and horizontal planes. Seventeen (15%) showed an inconsistency between the inclina- tion of the tracings on the horizontal and frontal planes. C o n c l u s i o n 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 horizon- tal masticatory angle, promoting the recovery of alternating unilateral masticatory function. K e y w o r d s Temporomandibular joint (TMJ), Gothic arch, functional masticatory angle of Planas (AFMP), functional horizontal masticatory angle (AFMO), masticatory cycle, lateral retrusion Posselt volume. 60 Volume 3 | Issue 1/2017 Journal of Oral Science & Rehabilitation

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