ABSTRACT
Occlusal vertical dimension (OVD) is the distance of the mandible from the maxilla determined by the length and position of teeth in central occlusion. In edentulous mouth OVD is not preserved. Tooth loss causes the loss of OVD, so that it must be determined in the appropriate way. In clinical practice, several methods and indicators are used, in making of full dentures that represents a dilemma for dentist practitian which methods to use for the establishment of appropriate OVD. The aim of this investigation was to compare the obtained results in application of physiological methods of phonation, deglutition and electromyography that were used for the determination of OVD. Investigation comprised 18 edentulous patients, of skeletal class I by Angle with healthy stomatognathic system. Estimation of results value of the applied methods was done electromyographically. Upon the obtained results of the investigation, it was concluded that the optimal accuracy was obtained by the method of electromyography, which was also confirmed by the measured OVD that was in average higher for 1.50-2.00 mm compared to OVD determined by the methods of phonation and deglutition. In the clinical practice, where possible, we recommend the method of electromyography in determination of OVD in edentulous patients, and subsequently the method of phonation and method of deglutition, respectively.
Subject(s)
Mouth, Edentulous/pathology , Vertical Dimension , Action Potentials , Deglutition , Dental Prosthesis Design , Electromyography , Female , Humans , Male , Masticatory Muscles/physiopathology , Middle Aged , Mouth, Edentulous/physiopathologyABSTRACT
The aim of the study was to determine the functional value of unrebased, rebased by Rehm and new complete dentures and compare the time of initial functional adaptation of patients to rebased and new complete dentures. The study included 72 subjects. The functional value of complete dentures was estimated by the test of masticatory muscles bioelectrical activity, by the test of masticatory efficiency and by the test of maximal physiological load. On the basis of the study it was concluded that the complete dentures rebased by Rehm were worthier in function than the unrebased ones, and the period of initial functional adaptation was missing. In the subjects with a pair of newly made complete dentures, functional tests revealed the reduction of the initial values after the new dentures were delivered. During the examination interval progressive dynamics with the tendency of establishing the optimal functional value and the initial functional adaptation was observed after 21 days.
Subject(s)
Denture Rebasing , Denture, Complete , Electromyography , Masticatory Muscles/physiology , Aged , Female , Humans , Male , MasticationABSTRACT
"Silent period" is the reflex pause or the period of suppressive activity that is subsequent to some sort of stimuli during or after the muscle contraction. In current dentistry, "silent period" registered by electromyography presents in functional diagnosis one of the parameters in revealing the functional disturbances of neuromuscular system. The aim of the study was to investigate the physiological duration of "silent period" in masticatory muscles. The group of examinees comprised 4 males and 4 females of average age 29 years. All the examinees were with healthy stomatognathic system and natural dentition. "Silent period" was registered by the apparatus "Medlec" Mystro-MS 20 using intramuscular electrodes. The results of the investigation indicated the different duration of physiological "silent period", depended on the type of investigated muscle.
Subject(s)
Electromyography , Masticatory Muscles/physiology , Adult , Electric Stimulation , Female , Humans , Male , Muscle ContractionABSTRACT
Silent period is reflex pause or period suppressed activity after some kind of simulation during or after muscular contraction. In dentistry electromyographically registered silent period has important place as method of functional diagnosis. The aim of this investigation was to establish duration of silent period in both masseter muscles of persons with complete dentures in normal increased and decreased occlusal vertical dimensions. Subjects of investigation were 4 men and 4 women, average of 65 years. Occlusal vertical dimensions were established electromyographically. For every subject tree sets of complete dentures were made: with normal, increased and decreased occlusal vertical dimension for 4 mm. Silent period was registered by "Medlec" Mystro-MS 20 apparatus with intramuscular leads. The differences of silent period duration were registered among all three vertical dimensions, especially between and increased occlusal vertical dimensions.
Subject(s)
Dental Occlusion , Denture, Complete , Electromyography , Masseter Muscle/physiology , Aged , Female , Humans , MaleABSTRACT
Adductor muscles muscular tone of new complete denture wearers in the period of initial functional adaptation was investigated as well as the use of visual feedback with EMG method for more efficient use of dentures. Thirteen persons of 63 years average were investigated. Action potential of masseter muscle surface layers and pterigoid muscles anterior layers on both sides were registered. Subjects were instructed how to adjust the mandible from the rest position to the full contact with upper denture teeth and to keep it that way for 5 minutes, 3 times a day. Intensity of measured muscle activity was controlled immediately after denture insertion as well as 7, 14 and 21 days after insertion. The greatest amplitude values of all of four examined muscles were registered after denture insertion. Expected changes due to the use of visual feedback had favorable effect on muscular tone lowering during the following period. Maximal therapeutic tone was reestablished.
