Muscular Activity Disorders in Relation to Intentional Occlusal Interferences

Abstract

The electromyographic activity (EMG) of the anterior temporal (AT), masseter (M), trapezius (T) muscles and anterior aspect of the digastric (D) was measured in 50 subjects, during six seconds of maximum contraction, bilaterally with and without unilateral premature contacts and individually for each tooth. Special occlusal interferences were designed to assess muscular activity. Muscular activity was measured simultaneously by placing premature contacts on each tooth, under T-Scan monitoring. Premature contacts reduced EMG activity during maximum contraction of the AT, D and M muscles, the highest disruption is in the AT muscle, at the level of upper right 2nd molar, with a 56% reduction in activity. Conversely, there was an increase of activity of the T muscle in all teeth when placing artificial occlusal premature contacts, with the highest difference in the upper right 1st bicuspid. Therefore, occlusal interferences can cause neuromuscular disruptions, thus inducing important muscular discrepancy. Both the EMG and T-Scan monitoring can be considered suitable methods to use in daily dental practice to identify premature contacts and to measure EMG activity.

Effect of different dental articulating papers on SEMG activity during maximum clenching

“…On the other hand, the presence of a skeletal malocclusion (Farronato et al , 2012), occlusal discrepancies or experimental balancing interferences produced variations of measured muscular activity with respect to control groups or between working and non-working sides (Ferrario et al , 1999;Learreta et al , 2007;Hugger et al , 2013).…”

“…Occlusal experimental interferences (obtained using different materials/thicknesses, placed on specific locations of the arch) can alter the function of jaw muscles and temporomandibular joints (Learreta et al , 2007;Hugger et al , 2013).…”

Temporomandibular joint dysfunction in Parkinson's Disease: an integrative literature review

“…Such asymmetry occurred in people with and without TMD, and according to the authors, this may have occurred due to the fact that individuals with PD have altered muscle and postural tonus that influence muscle activation and as a consequence of the position of the mandible 22 . Because constant contractions of the facial and neck muscles reflect on the number of occlusal contacts predominantly on the right side 30,31 . However, no significant difference was found in the distribution of right-to-left occlusal contacts in relation to the left between the groups with and without TMD (p = 0.883).…”

EMG spectral characteristics of masticatory muscles and upper trapezius during maximum voluntary teeth clenching

“…Current evidence underlines the existence of close interrelationships between the different components of the cranio-cervicalmandibular system, with coordinated activities of the mandibular, neck and trunk muscles (Armijo-Olivo and Magee, 2007;Ceneviz et al, 2006;Ferrario et al, 2003Ferrario et al, , 2006Ferrario et al, , 2007Learreta et al, 2007;Miralles et al, 2002;Pallegama et al, 2004;Tecco et al, 2007Tecco et al, , 2008Tecco et al, , 2011Zuniga et al, 1995). In healthy subjects, a quantitative assessment of these muscles during the performance of physiological jaw and neck movements may offer some knowledge about the normal mechanisms of their integrated action and nervous control (Armijo-Olivo and Magee, 2007;Ceneviz et al, 2006;Ferrario et al, 2003Ferrario et al, , 2006Forrester et al, 2010;Learreta et al, 2007;Miralles et al, 2002;Zuniga et al, 1995).…”

“…In healthy subjects, a quantitative assessment of these muscles during the performance of physiological jaw and neck movements may offer some knowledge about the normal mechanisms of their integrated action and nervous control (Armijo-Olivo and Magee, 2007;Ceneviz et al, 2006;Ferrario et al, 2003Ferrario et al, , 2006Forrester et al, 2010;Learreta et al, 2007;Miralles et al, 2002;Zuniga et al, 1995). For instance, in healthy subjects variations in the vertical dimension of occlusion have also effected the sternocleidomastoid and upper trapezius muscles (Ferrario et al, 2003;Miralles et al, 2002), and experimentally induced pain in the masseter muscle significantly modified neck muscular activity (Svensson et al, 2004).…”