ABSTRACT
A principal block scheme of an apparatus complex is suggested and a method for examination of masticatory muscle function is described. The method is based on electrostimulation of masticatory nerve followed by registration and analysis of the masticatory muscle action evoked potentials. The block scheme of the apparatus complex includes a universal electrostimulator ESU-2. Examinations of 30 healthy volunteers and 30 patients with unilateral fractures of the mandible helped define the major parameters of stimulation electromyography. The patients were treated by splints applied on the teeth with fixation on both jaws. By day 28 of the investigation the M-response amplitude dropped more than twofold and its length by 1.5 times as against the mean parameters in health.
Subject(s)
Electric Stimulation Therapy/instrumentation , Electromyography/instrumentation , Masticatory Muscles/physiology , Action Potentials , Adult , Electric Stimulation Therapy/methods , Electrodes , Electromyography/methods , Equipment Design , Humans , Mandibular Fractures/physiopathology , Mandibular Fractures/therapyABSTRACT
Principal block-diagram and characteristics of devices recording the parameters of periodontal muscular reflex in humans are presented. Twenty healthy volunteers aged 20 to 30 years with full dentition and normal occlusion and temporomandibular articulations unchanged were studied. Parameters of periodontal muscular reflex showed no bilateral asymmetry. Temporal muscles displayed 15 +/- 0.87 s latencies, masseters 13 +/- 0.8 latencies. Silent periods in temporal muscles were 22 +/- 0.89 ms and in masseters 24 +/- 0.75 ms. In patients with mandibular fractures the time of periodontal muscular reflex was increased up to 3-4-fold as compared to that in normal subjects. The indices of the reflex are clearly different in normal and pathological conditions. This technique is useful both in scientific and diagnostic purposes.
