scholarly journals Functional analysis of the results of using Ufi Gel P elastic soft lining from VOCO (Germany) as a means to reduce the time of adaptation to removable plate prostheses in the process of prosthetic rehabilitation of patients with asymmetric distally unlimited defects of dental rows in the early stages

2020 ◽  
Vol 103 (4) ◽  
pp. 53-60
Author(s):  
R. Symonenko ◽  
◽  
L. Etnis ◽  
Keyword(s):  
High Efficiency ◽  
Study Groups ◽  
Masticatory Muscles ◽  
Control Group ◽  
Bioelectrical Activity ◽  
Clinical Group ◽  
Bioelectric Activity ◽  
Rest Periods ◽  
Masticatory Efficiency ◽  
Elastic Lining

Objectives. Study of ways to increase the efficiency of immediate prosthetic treatment of patients with asymmetric distally unlimited defects of dental rows by using clinical relining of partial removable dentures with Ufi Gel P material from VOCO (Germany) to reduce the time of adaptation to dentures and normalize the functional activity of the masticatory muscles. Materials and methods. The efficiency of clinical relining of partial removable dentures using an elastic lining with Ufi Gel P from VOCO (Germany) was evaluated by electromyographic examination with BioEMG III electromyograph from BioRESEARCH Associates, Inc. (USA). The bioelectrical activity of the temporal and masseter muscles was evaluated during maximum voluntary clenching and mastication. The quantitative indicators of the amplitude of biopotentials (μV) and the qualitative characteristics of the chewing cycles were evaluated. Results. Our study has revealed that patients with asymmetric distally unlimited defects of dental rows had shown a significant decrease in the amplitude of biopotentials of the masticatory muscles compared to patients in the control group during maximum voluntary clenching and chewing, as well as a significant asymmetry of the bioelectric activity of the masticatory muscles on the right and left. During mastication there were significant differences in the size and duration of chewing cycles, a decrease in the duration of rest periods and the average number of chewing movements increased almost two times compared with intact dentition. A month after prosthetics, the indicators of bioelectrical activity of the masticatory muscles improved in both study groups of patients, but the most significant increase in amplitude was observed in the second group with a soft lining. There was also revealed a significant increase in the symmetry of bioelectric activity of the masticatory muscles, an improvement in the characteristics of the masticatory cycles and normalization of the activity and rest periods duration ratio in patients of the second group, while in patients of the 1st clinical group the indicators of symmetry did not change significantly. The average number of chewing movements required to chew the hazelnut kernel decreased to 38.7±16.2 and 29.3±10.7 respectively, in groups 1 and 2, which indicates an increase of masticatory efficiency. Conclusions. In the framework of this study, the high efficiency of Ufi Gel P (VOCO) elastic lining for the successful rehabilitation of patients with asymmetric distally unlimited defects in case of early prosthodontic interventions was proved. Our observations have shown that the use of the Ufi Gel P (VOCO) soft lining significantly increases the functional parameters of the masticatory system, shortens the period of adaptation to removable dentures and supports the formation of the alveolar processes relief without irregularities.

scholarly journals Analysis of the results of using elastic soft lining as a means to reduce the time of adaptation to removable plate prostheses in the process of the early prosthetic rehabilitation of patients

2020 ◽  
Vol 104 (5) ◽  
pp. 44-51
Author(s):  
R. Symonenko ◽  
◽  
L. Etnis ◽  
T. Kostiuk ◽  
◽  
...  
Keyword(s):  
High Efficiency ◽  
Study Groups ◽  
Masticatory Muscles ◽  
Control Group ◽  
Bioelectrical Activity ◽  
Clinical Group ◽  
Bioelectric Activity ◽  
Rest Periods ◽  
Masticatory Efficiency ◽  
Elastic Lining

Objectives. Study of ways to increase the efficiency of immediate prosthetic treatment of patients with asymmetric distally unlimited defects of dental rows by using clinical relining of partial removable dentures with elastic material to reduce the time of adaptation to dentures and normalize the functional activity of the masticatory muscles. Materials and methods. The efficiency of clinical relining of partial removable dentures using an elastic lining with Ufi Gel P from VOCO (Germany) was evaluated by electromyographic examination with BioEMG III electromyograph from BioRESEARCH Associates, Inc. (USA). The bioelectrical activity of the temporal and masseter muscles was evaluated during maximum voluntary clenching and mastication. The quantitative indicators of the amplitude of biopotentials (μV) and the qualitative characteristics of the chewing cycles were evaluated. Results. Our study has revealed that patients with asymmetric distally unlimited defects of dental rows had shown a significant decrease in the amplitude of biopotentials of the masticatory muscles compared to patients in the control group during maximum voluntary clenching and chewing, as well as a significant asymmetry of the bioelectric activity of the masticatory muscles on the right and left. During mastication there were significant differences in the size and duration of chewing cycles, a decrease in the duration of rest periods and the average number of chewing movements increased almost two times compared with intact dentition. A month after prosthetics, the indicators of bioelectrical activity of the masticatory muscles improved in both study groups of patients, but the most significant increase in amplitude was observed in the second group with a soft lining. There was also revealed a significant increase in the symmetry of bioelectric activity of the masticatory muscles, an improvement in the characteristics of the masticatory cycles and normalization of the activity and rest periods duration ratio in patients of the second group, while in patients of the 1st clinical group the indicators of symmetry did not change significantly. The average number of chewing movements required to chew the hazelnut kernel decreased to 38.7±16.2 and 29.3±10.7 respectively, in groups 1 and 2, which indicates an increase of masticatory efficiency. Conclusions. In the framework of this study, the high efficiency of elastic lining for the successful rehabilitation of patients with asymmetric distally unlimited defects in case of early prosthodontic interventions was proved. Our observations have shown that the use of the soft lining significantly increases the functional parameters of the masticatory system, shortens the period of adaptation to removable dentures and supports the formation of the alveolar processes relief without irregularities.

scholarly journals Assessment of the bioelectric activity of the masticatory muscles in orthopedic treatment with partial removable plate prostheses

2021 ◽  
Author(s):  
A. V. Ivaschenko ◽  
A. E. Yablokov ◽  
M. V. Shcherbakov ◽  
I. V. Bazhutova ◽  
S. V. Vinnik
Keyword(s):  
Masticatory Muscles ◽  
Control Group ◽  
Bioelectrical Activity ◽  
Main Criterion ◽  
Orthopedic Treatment ◽  
Bioelectric Activity ◽  
Removable Plate ◽  
The Right ◽  
Full Adaptation ◽  
Number Of Authors

Relevance. According to a number of authors, it is known that full adaptation to complete removable dentures occurs within 3 months [3–5, 9]. The main criterion for patients getting used to removable dentures is the synchronization of the work of the masticatory muscles and, as a consequence, the normalization of the chewing function.The aim of the study was to evaluate the bioelectrical activity of the masticatory muscles in patients using the CSPP.Materials and methods. In patients of the control (n = 23) and main (n = 63) groups, electromyographic examination was performed using the electroneuromyographic system "Synapsis" (Neurotechnology, Russia). Registration of the bioelectric activity of the chewing muscles was carried out directly on the day of applying the prostheses, after 1 and 3 months, respectively.Results and discussion. The electromyographic indices of the masticatory muscles in the patients of the control group decreased within one month after the treatment and amounted to 231 ± 18.2 μV for the right and 229 ± 16.1 μV for the left proper chewing muscles. The values were also reduced for the right and left temporal muscles – 228 ± 15.2 μV and 225 ± 24.1 μV (p < 0.05). It should be noted that the electromyographic parameters in patients of the main group were comparable to the lower limit of the norm and amounted to 269 ± 16.5 μV and 256 ± 20.4 μV, respectively, after one month of treatment.Conclusions. In the treatment of dysfunction of the temporomandibular joint with the use of thermoplastic prostheses, an increase in the biopotentials of the masticatory muscles is observed. In the orthopedic treatment of patients with terminal dentition defects using thermoplastic prostheses, the electromyographic parameters of the masticatory muscles are most close to normal after 3 months of using these prostheses.

scholarly journals Therapeutic and rehabilitation complex for the treatment of patients with chronic generalized periodontitis and bruxism

2020 ◽  
Vol 17 (5) ◽  
pp. 252-257
Author(s):  
Rasima R. Khaybullina ◽  
Larisa P. Gerasimova ◽  
Lira T. Gilmutdinova ◽  
Marina Yu. Gerasimenko
Keyword(s):  
High Efficiency ◽  
Clinical Symptoms ◽  
Blood Perfusion ◽  
Control Group ◽  
Bioelectric Activity ◽  
Temporal Muscle ◽  
Doppler Flowmetry ◽  
Flow Perfusion ◽  
Therapeutic Procedures ◽  
Relationship Of

Background. The article discusses modern concepts of the relationship of periodontal disease and bruxism. Aim: to study the efficiency of the proposed therapeutic and rehabilitation complex for patients with chronic generalized periodontitis and bruxism. Methods. 73 patients aged 3045 years with a diagnosis of chronic generalized periodontitis of moderate severity and bruxism were examined. The control group consisted of 15 apparently healthy individuals of the same age to clarify the functional parameters of the norm. To assess the effectiveness of the proposed therapeutic and rehabilitation complex, clinical, Doppler flowmetric and electromyographic research methods were used. Results. High efficiency of the therapeutic and rehabilitation complex in the treatment of chronic generalized moderate periodontitis and bruxism has been revealed. An analysis of changes in time of clinical symptoms revealed that when using this program, which includes basic therapy, laser phoresis, ozone irrigation of the gums, the intake of phyto-complex and local-mineral complexes, the use of dental pins with propolis and phytocomplex, physiotherapy exercises and fluctuorization, positive changes were pronounced. Under the influence of the course effect of therapeutic procedures, patients showed an increase in blood perfusion volume by 37.7% (p 0.05), blood flow perfusion rate by 58.2% (p 0.05) from the initial values. At the same time, a decrease by 51.82% (p 0.05) from the initial indices of bioelectric activity of the temporal muscle at rest was registered, as well as by 40.4% (p 0.05) with voluntary constriction, and a decrease in the bioelectric activity of the mastication muscle at rest by 47.4% (p 0.05), and with voluntary constriction by 35.12% (p 0.05). Conclusion. The data obtained based on electromyography and laser Doppler flowmetry indicate that the developed treatment and rehabilitation complex is an effective method for correcting the microcirculation of periodontal vessels, the functional activity of the maxillofacial muscles.

scholarly journals FEATURES OF MANUFACTURE OF ADVANCED PROVISIONAL BRIDGE-BASED PROSTHESES

2021 ◽  
pp. 33-37
Author(s):  
А. В. Kostyshyn
Keyword(s):  
High Efficiency ◽  
Age Groups ◽  
Masticatory Muscles ◽  
Pathological Process ◽  
Muscle Group ◽  
Control Group ◽  
Masticatory Muscle ◽  
Orthopedic Treatment ◽  
Group 2 ◽  
Reinforcement Model

Abstract. The relevance of the topic is related to the need to improve methods of preparation of dentitions for orthopedic treatment, taking into account the defects of dentitions in patients with reduced occlusion height, taking into account the condition of the masticatory muscles and temporary use of plastic dentures, which provide gradual lifting of occlusion to normalize the masticatory group muscles and reorganization of myostatic reflexes. The aim of the research. Improving the effectiveness of preparation for orthopedic treatment of patients with partial tooth loss, with reduced occlusion height, by improving the design of a temporary bridge-based prosthesis. Materials and methods of research. We examined, treated and conducted clinical observation of 93 patients, who were divided into three groups according to the height of the reduction in occlusion, to achieve this goal and solve problems during the dissertation. Group 1 consisted of 32 patients with included dentition defects with reduced occlusion height up to 2 mm (n=32), group 2 - patients with included dentition defects with reduced occlusion height up to 2-4 mm (n=31), group 3 - these are patients with included dentition defects with reduced occlusion height up to 4-6 mm (n=30). All patients of the main groups belonged to the second and third age groups according to the WHO, aged 35-55 years. The control group (n=30) are young people who belonged to the 1st age group according to the WHO with intact dentition, without concomitant somatic and dental pathology, were admitted in one visit. Also, 123 fiberglass-reinforced plastic prostheses were made. Research results. When drawing up a plan for orthopedic treatment of patients with reduced occlusion height, we took into account possible complications, which are characterized by chipping of the facing material, pathological changes in the temporomandibular joint and masticatory muscle group. We have improved the method of manufacturing non-removable temporary plastic orthopedic constructions by reinforcing with fiberglass tapes and beams, to prevent them and gradually raise the bite. Expanded data on the dynamics of changes in myostatic reflexes and the effectiveness of the use of fixed orthopedic constructions, depending on the pathological process, the timing of adaptation of the masticatory muscle group to orthopedic constructions, according to the degree of reduction in occlusion height. The absence of complaints of breakage and other technical defects of the proposed temporary orthopedic constructions in 100% of cases, successfully allows to use it in the clinic of orthopedic dentistry. A new method of preparing patients for permanent orthopedic treatment by combined reinforcement of temporary non-removable bridge constructions with fiberglass tapes and beams is proposed, which differ in that after preliminary modeling of the frame of the bridge constructions, the technology of double reinforcement, model two support platforms with a step-like transition between them, in which fiberglass tapes and beams are fitted with dental tweezers, after which they are polymerized by the generally accepted method with a photopolymer lamp. Complete the modeling of the constructions and polymerize the prosthesis in the pneumopolymerizer with subsequent grinding and polymerize the prosthesis. Conclusion. The results of the research revealed the high efficiency of the improved method of manufacturing non-removable makeshift plastic of orthopedic constructions.

scholarly journals THE ANALYSIS OF EMG VALUES IN PATIENTS USING REMOVABLE IMPLANT-RETAINED OVERDENTURES FOR A LONG PERIOD OF TIME

2019 ◽  
Vol 15 (3) ◽  
pp. 139-145 ◽  
Author(s):  
Любовь Дубова ◽  
Lyubov Dubova ◽  
Евгений Ожигов ◽  
Evgeniy Ozhigov ◽  
Алексей Ступников ◽  
...  
Keyword(s):  
Normal Level ◽  
Clinical Studies ◽  
Masticatory Muscles ◽  
Dynamic State ◽  
Bioelectrical Activity ◽  
Dynamic Parameters ◽  
Bioelectric Activity ◽  
Long Period ◽  
Stomatognathic System

Subject. The state of the stomatognathic system in patients who used removable implant-retained overdentures for a period more than 4 years was analyzed by evaluating the bioelectrical activity of temporal and masticatory muscles. Objectives ― to analyze the influence of long-term usage of removable implant-retained overdentures on the dynamic parameters of the stomatognathic system by evaluating the bioelectrical activity of temporal and masticatory muscles. Methods. Clinical studies of bioelectrical activity and symmetry of the temporal and masticatory muscles using surface electromyography were carried out. Electromyography was carried out in five probes: physiological rest, occlusion, natural swallowing, clench and clench on rolls. Results. It was revealed that in a state of physiological rest and occlusion, the absolute electromyography indicators were elevated. During natural swallowing, the bioelectric activity of the muscles in patients who used removable implant-retained overdentures was characterized as reduced. During clenching and clenching on rolls, the indicators were at the level of the lower limit of the norm. It was also found that the symmetry of the temporal and masticatory muscles was below the normal level. Conclusions. The obtained data is a sign of the modified dynamic state of the stomatognathic system in patients who used removable implant-retained overdentures. In addition to changes of the bioelectric activity of the muscles, a significant violation of the symmetry of the muscles has been revealed.

scholarly journals Therapeutic and rehabilitation complex for the treatment of patients with chronic generalized periodontitis and bruxism

2020 ◽  
Vol 17 (5) ◽  
pp. 252-257
Author(s):  
Rasima R. Khaybullina ◽  
Larisa P. Gerasimova ◽  
Lira T. Gilmutdinova ◽  
Marina Yu. Gerasimenko
Keyword(s):  
High Efficiency ◽  
Clinical Symptoms ◽  
Blood Perfusion ◽  
Control Group ◽  
Bioelectric Activity ◽  
Temporal Muscle ◽  
Doppler Flowmetry ◽  
Flow Perfusion ◽  
Therapeutic Procedures ◽  
Relationship Of

Background. The article discusses modern concepts of the relationship of periodontal disease and bruxism. Aim: to study the efficiency of the proposed therapeutic and rehabilitation complex for patients with chronic generalized periodontitis and bruxism. Methods. 73 patients aged 3045 years with a diagnosis of chronic generalized periodontitis of moderate severity and bruxism were examined. The control group consisted of 15 apparently healthy individuals of the same age to clarify the functional parameters of the norm. To assess the effectiveness of the proposed therapeutic and rehabilitation complex, clinical, Doppler flowmetric and electromyographic research methods were used. Results. High efficiency of the therapeutic and rehabilitation complex in the treatment of chronic generalized moderate periodontitis and bruxism has been revealed. An analysis of changes in time of clinical symptoms revealed that when using this program, which includes basic therapy, laser phoresis, ozone irrigation of the gums, the intake of phyto-complex and local-mineral complexes, the use of dental pins with propolis and phytocomplex, physiotherapy exercises and fluctuorization, positive changes were pronounced. Under the influence of the course effect of therapeutic procedures, patients showed an increase in blood perfusion volume by 37.7% (p 0.05), blood flow perfusion rate by 58.2% (p 0.05) from the initial values. At the same time, a decrease by 51.82% (p 0.05) from the initial indices of bioelectric activity of the temporal muscle at rest was registered, as well as by 40.4% (p 0.05) with voluntary constriction, and a decrease in the bioelectric activity of the mastication muscle at rest by 47.4% (p 0.05), and with voluntary constriction by 35.12% (p 0.05). Conclusion. The data obtained based on electromyography and laser Doppler flowmetry indicate that the developed treatment and rehabilitation complex is an effective method for correcting the microcirculation of periodontal vessels, the functional activity of the maxillofacial muscles.

scholarly journals The role of interleukins 17, 23 and antibodies to the thyroid-stimulating hormone receptor in the pathogenesis of endocrine ophthalmopathy

2018 ◽  
Vol 14 (2) ◽  
pp. 72-80
Author(s):  
Svetlana V. Charinzeva ◽  
Elizaveta S. Taskina
Keyword(s):  
Hormone Receptor ◽  
Comparison Group ◽  
Study Groups ◽  
Thyroid Stimulating Hormone ◽  
Control Group ◽  
Clinical Activity ◽  
Clinical Group ◽  
Endocrine Ophthalmopathy ◽  
Stimulating Hormone

Background. Endocrine ophthalmopathy (EOP) is an autoimmune orbit disease characterized by soft retrobulbar tissues damage. The level of antibodies to the thyroid-stimulating hormone receptor (TSHRAbs) is considered as a laboratory marker of EOP activity. Interleukins 17 (IL-17) and 23 (IL-23) play an important role in the pathogenesis of some autoimmune diseases and directly correlate with clinical activity. At present, there is an open question about the role of these cytokines in EOP and their relationship with TSHRAbs. Aims. To assess pathogenetic role of IL-17, IL-23 and TSHRAbs in patients with EOP. Materials and methods. The study included 50 people (100 eyes) at the age of 43 [35; 50] years. Three study groups were formed: 32 patients with moderate severity of EOP (clinical group), 18 patients with thyroid pathology without EOP (comparison group) and 15 healthy subjects (control group). All groups were comparable in age and sex. The diagnosis was verified clinically, laboratory and instrumentally. A comprehensive ophthalmologic examination and blood sampling were performed to determine the concentrations of IL-17, IL-23 and TSHRAbs. Statistical processing of the data was carried out in the program “Statistica 10.0”, StatSoft, Inc. Results. An increase in the level of TSHRAbs was observed in all phases of EOP activity in comparison with both comparison group and control (p < 0.05). But in the active phase TSHRAbs level reached the maximum values in 100% of patients. An increase in the IL-17 concentration in 5,3 times was found in the active EOP in comparison with the control group (p < 0.05). Concentration of TSHRAbs and IL-17 in blood serum directly correlates with EOP activity (p < 0.001). After carrying out pulse therapy with glucocorticosteroids, the consentration of IL-17 decreased almost to zero. There were no significant differences in the level of IL-23 in the groups (p = 0.56). Conclusions. Determination of TSHRAbs and IL-17 levels in serum can be used as a laboratory diagnostic marker of EOP activity.  

Trajectories of stress reactions and somatization symptoms among war veterans: a 20-year longitudinal study

2010 ◽  
Vol 41 (2) ◽  
pp. 353-362 ◽  
Author(s):  
K. Ginzburg ◽  
Z. Solomon
Keyword(s):  
Study Groups ◽  
Stress Reaction ◽  
Control Group ◽  
Clinical Group ◽  
Stress Reactions ◽  
Post Traumatic Stress ◽  
War Stress ◽  
Post Traumatic ◽  
Mutual Change

BackgroundThere is considerable evidence that immediate and long-term stress reactions are associated with increased somatic symptomatology. However, because of the scarcity of long-term longitudinal studies, the trend of mutual change of these factors has not been assessed. This study examined the chronological inter-relationships between post-traumatic stress reactions and somatization symptoms among combatants over a 20-year period.MethodTwo groups of veterans were assessed 1, 2, 3 and 20 years after their participation in the 1982 Lebanon War: a clinical group of veterans who had been diagnosed with combat stress reaction (CSR) on the battlefield (n=363), and a matched control group of veterans (n=301).ResultsThe CSR veterans reported higher initial levels of intrusion and avoidance and a steeper decline in those symptoms over time in comparison to the control group. The former also reported higher initial levels of somatization symptoms than the latter. In addition, over the years, stress reactions were positively associated with somatization symptoms. For both study groups, in the first years after the war, stress reaction symptoms predicted somatization symptoms. However, with time, the trend was reversed and somatization symptoms predicted stress reactions.ConclusionsThe findings suggest that CSR is a marker for future stress reactions and somatization symptoms, and indicate a long-term role for these symptoms in veterans' psychological distress.

scholarly journals CHARACTERISTICS OF THE BIOELECTRIC ACTIVITY OF THE MASTICATORY MUSCLES IN PATIENTS WITH HEARING DEPRIVATION IN PERMANENT OCCLUSION IN THE PHYSIOLOGICAL STATE

2020 ◽  
pp. 64-68
Author(s):  
V.D. Kuroiedova ◽  
Yu.K. Sokolohorska-Nykina
Keyword(s):  
Hearing Loss ◽  
Physiological State ◽  
Masticatory Muscles ◽  
Normal Hearing ◽  
Hearing Impaired ◽  
Control Group ◽  
Bioelectric Activity ◽  
Temporal Muscle ◽  
Functional Relationships ◽  
Functional Features

The study of the muscles of the maxillofacial area both in normal and pathological occlusions is the area of great interest, since muscle function is an indicator of complex functional relationships of the dento-mandibular system. Hearing impaired patients have many features related to the functional features of the maxillofacial area due to the slight or complete lack of use of facial muscles during speech or through the use of sign language. Hearing impaired children have 100% of bite pathology. The functional state of chewing and temporal muscles in schoolchildren with hearing loss in constant bite at rest was studied. Twenty-five hearing impaired students with permanent dentistry were studied at Poltava Special Boarding School for Deaf Children, who formed the study group. Among them, there were 13 women (62.5%) and 12 men (37.5%). The mean age was 18.7 ± 1.31 years. The control group used the data of the study of patients with constant physiological bite without hearing disorders, determined by M. I. Dmytrenko. The average age was 21.3 ± 1.25 years. The bioelectric activity of the chewing muscles was examined on an electromyographic complex. The average values of oscillation amplitude (μV) of muscle biopotential on both sides were determined. Muscle biopotentials were recorded for five seconds in a state of physiological calm with closed lips. The results show that all indicators of PD of chewing muscles in a state of physiological rest are almost 2 times higher (p˂0,05) in comparison with those of patients with normal hearing and physiological bite. The work of the temporal muscles in schoolchildren with hearing loss is characterized by symmetry. There is also greater electrical activity of the temporal muscle than the masticatory muscles at rest, unlike normal hearing patients. All patients with hearing impairment had 100% prevalence of dental anomalies. Biopotential of chewing muscle of I class. for angle was 2.7 times higher than in patients with the control group. The biopotential of the temporalis muscle in the ICE was 1.8 times higher (p˂0.05), which indicates a constant tension or insufficient muscle relaxation in patients with ICE. In patients with hearing loss of II class. for angle, the average value of the biopotential of the chewing muscle was 2.3 times higher than in patients in 2 group, the temporal muscle was 1.5 times higher.

scholarly journals Masticatory Muscles Activity in Sport Climbers

2020 ◽  
Vol 17 (4) ◽  
pp. 1378 ◽  
Author(s):  
Michał Ginszt ◽  
Grzegorz Zieliński ◽  
Aleksandra Byś ◽  
Piotr Gawda ◽  
Piotr Majcher
Keyword(s):  
Muscle Activity ◽  
Masticatory Muscles ◽  
The Body ◽  
Control Group ◽  
Bioelectrical Activity ◽  
Masticatory Muscle ◽  
Sports Activity ◽  
Sport Climbing ◽  
Teeth Clenching ◽  
Masticatory Muscle Activity

Masticatory muscle activity during teeth clenching is associated with changes in many physiological parameters throughout the body. Clenching can improve muscle activity, force production, rate of force development, and joint fixation. Hence, teeth clenching and masticatory muscle activity can be important in competitive sports activities. Sport climbing is becoming increasingly popular and will be included for the first time in the Summer Olympic Games, Tokyo, 2020. However, masticatory muscle activity in sport climbers has not yet been studied. The aim of the presented study is to compare the bioelectrical activity of the masticatory muscles in sport climbers and non-climbers in order to determine the relationship between these muscles and climbing activity. 44 subjects without masticatory system disorders (16 women and 28 men, average age 26.3) were divided into two groups of 22 sport climbers (8 women, 14 men, climbing experience >4 years), while 22 people (8 women, 14 men, with no regular sports activity) were assigned to the control group. Electromyographic examination of temporalis anterior (TA) and masseter muscle (MM) was evaluated in three conditions: during resting mandibular position, during maximum intercuspation clenching, and during maximum voluntary clenching with cotton rolls between teeth. For statistical analysis, the W Shapiro-Wilk test and the Mann-Whitney U test were used. Sport climbers showed significantly higher bioelectrical activities of MM during maximum intercuspation clenching (238.45 μV vs. 83.87 μV, p = 0.002), and during maximum voluntary clenching with cotton rolls between teeth (300.01 μV vs. 101.38 μV, p = 0.001) compared to controls. The differences between groups in relation to the resting bioelectrical activity of the MM muscles, and TA muscles in all conditions were not statistically significant (p > 0.05). Higher bioelectrical activity of masseter muscles during clenching in climbers can be associated with this sports activity. However, the mechanism remains unknown and requires future research.

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