METHOD OF ESTIMATION OF DENTO-ALVEOLAR APPARATUS FUNCTIONAL STATE Russian patent published in 2009 - IPC A61C19/04 A61B5/488 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to dentistry, and can be used for estimation of functional state of dento-alveolar apparatus (DAA). During estimation of DAA electromiograms (EMG) from chewing muscles are registered. On registered EMG seven stages are determined, where at the first stage amplitude of EMG at rest stage is determined, at the second stage amplitude of EMG of maximal jaw pressure, at the third stage time of EMG amplitude stabilisation after maximal jaw pressure is determined, at the fourth stage EMG amplitude after maximal jaw pressure is determined, at the fifth stage EMG amplitude during test material grinding is determined, at the sixth stage time of EMG amplitude stabilisation after test material grinding is determined, at the seventh stage EMG amplitude after test material grinding is determined; at each stage EMG amplitudes and areas under EMG from left and right chewing muscles are analysed. At each stage asymmetry coefficient is determined as ratio of EMG amplitude values from left and right chewing muscles, and if asymmetry coefficient is less than 0.8 and higher than 1.2 DAA pathology caused by disorder of temporo-mandibular joint (TMJ) and, or muscle tone is diagnosed. If time of EMG amplitude stabilisation after maximal jaw pressure and, or performing twenty chewing movements is more than 2 seconds and EMG amplitude value at which signal stabilised is higher than 0.05 mV, pathologic state of chewing muscles is diagnosed. If ratio of EMG maximal amplitude during test material grinding and amplitude of EMG of maximal jaw pressure differs from values 60-75% pathology of chewing muscles and, or pathological afferentation from joint and, or disorder of neuro-humoral regulation of chewing muscle function is diagnosed. Registration of EMG at rest after maximal pressure and after performing 20 chewing movements is carried out during 25 seconds, criterion of quality registration being absence of artefacts during registration.

EFFECT: method ensures increase of quality of estimation of functional state of dento-alveolar apparatus due to clear quantitative evaluations.

11 cl, 2 ex