[Functional state of maxillofacial muscles in patients with dentition defects depending on the number of missing antagonist pairs]. / Funktsional'noe sostoianie myshts cheliustno-litsevoi oblasti pri defektakh zubnykh riadov v zavisimosti ot kolichestva otsutstvuiushchikh par antagonistov.

Changes in the functions of maxillofacial muscles were studied in patients with first-class defects of dentition. The mean biopotential of masticatory muscles in patients lacking 1 antagonist pair is 30.4% and in those lacking 4 pairs 59.5% lower vs. the norm. The bio-excess coefficient is 23.7% decreased in subjects lacking 1 antagonist pair and 52% decreased in those lacking 4 antagonist pairs. Hence, the function of maxillofacial muscles depends on the extent of dentition defect.

[The characteristics of the muscular activity of the maxillofacial area in persons with partial tooth loss depending on the extent of the dentition defect]. / Kharakteristika deiatel'nosti myshts cheliustno-litsevoi oblasti u lits s chastichnoi utratoi zubov v zavisimosti ot protiazhennosti defekta zubnogo riada.

The electromyogram (EMG) amplitude of the masticatory and temporal muscles is decreased and EMG amplitude of suprasublingual muscles increased during mastication or voluntary occlusion in patients with class I dentition defects in comparison with the controls. The changes were the greater, the more antagonist pairs were missing. The duration of masticatory period and the number of masticatory movements increased. The most notable changes in the muscular activity are observed in subjects with 4 antagonist pairs missing.