ORAL REHABILITATION
STANDARDIZED ELECTROMYOGRAPHIC INDEXES ALLOW A RELIABLE MEASUREMENT OF MASTICATORY MUSCLES FUNCTION
Riccardo Rosati 1a * , Ekaterina Semelewa 2b , Elena Satygo 2c , Elena P . Ivanova 3d , Francesco Rosati 4e , Alexey Silin 2c , Virgilio F . Ferrario 1b
1
Università degli Studi di Milano , Milano , Italy
2
North-Western State Medical University named after I . I . Mechnikov , Saint-Petersburg , Russian Federation
3
Moscow State University of Medicine and Dentistry named after A . I . Evdokimov , Moscow , Russian Federation
4
Private Practice , Udine , Italy a
DDS , PhD b
MD , PhD c
MD , DMD d
DMD , PhD e
CDT , Private Practitioner
Received : March 15 , 2016 Accepted : Jun 4 , 2016
Available online : July 14 , 2016
Cite this article : Rosati R , Semelewa E , Satygo E , Ivanova EP , Rosati F , Silin A , Ferrario VF . Standardized electromyographic indexes allow a reliable measurement of masticatory muscles function . Stoma Edu J . 2016 ; 3 ( 2 ): 235-242 .
ABSTRACT
Introduction : Surface electromyography ( sEMG ) allows the quantitative and qualitative analysis of muscles recruitment and it is a method currently used in research and in the clinical practice . Considering that sEMG assesses the portion of muscular electrical activity that reaches cutaneous surface , a well-standardized protocol should be used , allowing to remove ( or reduce ) technical and biological artefacts . Methodology : To evaluate the repeatability of the normalized indexes describing masticatory muscles sEMG , the standardized cutaneous myoelectric activity of Temporalis Anterior and Masseter muscles was recorded twice during a one week interval ( Acquisition sessions T1 and T2 ) in 20 young healthy adults . The data obtained during T1 and T2 were compared . A clinical case was shown as an example of clinical sEMG application . Results : No significant differences in the standardized indexes elaborated by sEMG signals of T1 and T2 acquisition sessions were found , strengthening the effectiveness of the standardization procedure . Conclusion : sEMG indexes allow the evaluation of occlusal-induced proprioceptive mediated muscular recruitment in a reliable way . This measurement protocol can be clinically applied to estimate the muscular adaption to new occlusal conditions or to re-establish physiological muscular coordination . Keywords : sEMG , dental proprioception , occlusion , oral rehabilitation , overlay .
1 . Introduction Every day the stomatognathic apparatus constantly performs many physiologic activities , such as speech , mastication , suction , deglutition . The muscles responsible for the mandibular , tongue , hyoid , soft palate , lips movements generate mechanical forces that are dissipated by the hard tissues ( bones , temporomandibular joint , teeth ). In all these functions several muscle groups are involved and coordinated by the central nervous system under the influence of peripheral inputs . Surface electromyography ( sEMG ) is a low-cost , non-invasive method usable in research and in dental clinical practice for the quantitative and qualitative analysis of head and neck muscles 1-23 . As sEMG does not directly assess the muscular fibers , a well-standardized protocol should be used , allowing to remove ( or reduce ) technical and biological artefacts . Indeed , the thickness of the hypodermis , crosstalk from different muscles , the instrumental noise and the position of the electrodes relative to the muscle fibers and the motor point can influence the sEMG signal . Taking into account these technical features , a correct sEMG assessment should be performed only with a reproducible protocol , and with standardized ⁄ normalized potentials to remove most of biological and technical noise 2 , 3 , 8 , 9 , 10 , 13 . The aim of the present study was to evaluate the repeatability of masticatory muscles
* Corresponding author :
Riccardo Rosati , DDS , PhD , Università degli Studi di Milano , Via Luigi Mangiagalli 31 , I-20133 Milano , Italy Phone : + 39 02 50315390 , Fax : + 39 02 50315387 , e-mail : riccardo @ riccardorosati . eu
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