AGE-RELATED AND POST-EXTRACTION ATROPHY OF THE JAWS AND MODERN POSSIBILITIES FOR RESTORING THE MASTICATORY APPARATUS IN THE ELDERLY PEOPLE

Представлены данные клинического обследования 3 329 человек (1 760 мужчин и 1 569 женщин), проживающих в различных регионах РФ (Санкт-Петербург и Ленинградская обл., Москва и Московская обл., Краснодарский край). Цель работы заключалась в изучении частоты утраты зубов и клинических проявлений атрофии альвеолярных отростков (частей) челюстей у пациентов старших возрастных групп для оценки возможности стоматологической реабилитации с использованием ортопедических конструкций на дентальных имплантатах. Изучение распространенности и степени атрофии показало, что в старшей возрастной группе у пациентов в большей мере преобладала 4-я и 5-я степень атрофии, частота встречаемости составила около 20-30 %. Встречаемость 6-й степени атрофии также была выше, чем в других возрастных группах, - она была обнаружена у 17,22 % мужчин и 17,81 % женщин на верхней челюсти и у 22,18 и 15,79 % - на нижней челюсти соответственно. Несмотря на то, что количество пожилых пациентов с полной или частичной утратой зубов не имеет тенденции к снижению, на современном этапе развития стоматологии и дентальной имплантологии восстановление целостности жевательного аппарата с применением искусственных опор возможно фактически во всех клинических случаях. Наличие коморбидной или мультиморбидной патологии не является абсолютным противопоказанием, а является лишь временны΄м фактором, откладывающим стоматологическую реабилитацию до стабилизации общесоматического статуса пациента. The data of clinical examination of 3 329 people (1 760 men and 1 569 women) living in various regions of the Russian Federation (St. Petersburg and Leningrad region, Moscow and Moscow region, Krasnodar Territory) are presented. The aim of the investigation was to study the frequency of tooth loss and clinical manifestations of atrophy of the alveolar processes (parts) of the jaws in patients of older age groups to assess the possibility of dental rehabilitation using orthopedic structures on dental implants. The study of the prevalence and degree of atrophy showed that in the older age group, patients of senile age were more dominated by 4 and 5 degrees of atrophy, the frequency of their occurrence was about 20-30 %. The incidence of grade 6 atrophy was also higher than in other age groups, it was found in 17,22 % of men and 17,81 % of women in the upper jaw and 22,18 % and 15,79 % in the lower jaw, respectively. Despite the fact that the number of patients in older age groups with complete or partial loss of teeth does not tend to decrease, at the present stage of development of dentistry and dental implantology, the possibility of restoring the integrity of the masticatory apparatus with the use of artificial supports is possible in virtually all clinical cases. The presence of comorbid or multimorbid pathology is not an absolute contraindication, but is only a temporary factor that postpones dental rehabilitation until the general somatic status of the patient is stabilized.

ELECTROMYOGRAPHY OF MUSCULOFACIAL REGION MUSCLES AND RESULTS OF PSYCHOLOGICAL EXAMINATIONS IN WORKERS WITH HAZARDOUS WORKING CONDITIONS

According to the data of targeted examinations of workers with hazardous working conditions, in particular, in the presence of a radiation factor, the dental status in terms of the prevalence and intensity of major dental diseases does not differ significantly from those working in normal working conditions. At the same time, during interviews and clinical examination, workers in hazardous industries often reveal hypertonicity of the muscles of the maxillofacial region, which is especially noticeable in people with long work experience. One of the reasons for the hypertonicity of the muscles of the maxillofacial region can be chronic stressful loads associated with hazardous working conditions. However, this section of functional dentistry has not been sufficiently studied in relation to workers in hazardous industries. It is required to compare the results of electromyography of the muscles of the maxillofacial region and the data of psychological examination of workers. The aim of the study is to compare the psychological characteristics and the results of electromyography of the muscles of the maxillofacial region in workers with hazardous working conditions and normal working conditions in the 45-55 age group. Material and Methods: A comparative analysis of electromyography data of masticatory and temporal muscles, "Hamburg testing" of the masticatory apparatus and psychological characteristics was carried out in 50 workers of hazardous industries (radiation production factor) and in 53 workers in normal working conditions. Results of the study: the study revealed differences in the results of psychophysiological examination, "Hamburg testing" of the chewing apparatus and electromyography of the muscles of the maxillofacial region in workers with hazardous working conditions and working in normal conditions. Employees of hazardous industries, according to psychological examination, are subject to chronic stress, which leads to a distortion of the tone of the muscles of the maxillofacial region, which, in turn, causes more frequent detection of dysfunction of the masticatory apparatus in workers. Conclusion: the results of the study should be taken into account in the complex dental rehabilitation of workers in hazardous industries, including measures aimed at normalizing the muscle tone of the maxillofacial region.

Dental health of civil aviation flight personnel

BACKGROUND: Preservation and strengthening of the health of civil aviation flight personnel is an extremely urgent problem and is associated with ensuring flight safety. AIM: This study aimed to determine the structure and analyze the organs and tissues of the masticatory apparatus among civil aviation flight personnel. MATERIALS AND METHODS: To determine the incidence and intensity of main dental diseases and the morbidity structure of organs and tissues of the masticatory apparatus in civil aviation pilots, an in-depth examination was carried out in 120 men aged 2545 years (study group 1) working on various modern passenger and transport aircrafts. The duration of flight operations ranged from 2 to 17 years, with a total flight duration of 140 to 5580 h. The comparison group consisted of 146 men (aged 2545 years) of non-flying specialties (study group 2). The generally accepted methods for assessing the prevalence and intensity of the course of major dental diseases were used. RESULTS: The incidence and intensity of dental disorders, periodontal disease, temporomandibular joint disorders, and parafunctions of the masticatory muscles were defined. The incidence and intensity of major dental diseases among civil aviation flight personnel were clearly directly proportional to their flight time (r=0.547) and duration of work in civil aviation (r=0.482) but to a lesser extent to their age (r=0.416). CONCLUSIONS: Non-carious lesions of the teeth, inflammatory and dystrophic diseases of the periodontal and oral mucosa, painful dysfunction of the temporomandibular joint, and bruxism are more common among civil aviation flight personnel than among non-flying personnel, which is due to the unfavorable effect of air flight factors on organs and tissues of the mastication apparatus and the body of the pilots as a whole.

Efficiency of the concept of prevention and treatment of dental diseases in persons with occupational stressful loads

Workers in stressful industries include workers with hazardous working conditions (HWC), in particular, with a radiation production factor. Clinical and X-ray dental examination of workers with OUT was carried out, Hamburg testing of the chewing apparatus, electromyography of the masticatory muscles, computer analysis of occlusion were carried out. Based on the identified need for treatment and prosthetics, the Concept for the Prevention and Treatment of Dental Diseases in Persons with Occupational Stressful Stress was developed, which includes comprehensive dental rehabilitation of workers using electromyographic, occlusive control during treatment, followed by dispensary control at least twice a year. After a year of implementation of the Concept, re-examination showed a significant decrease in the prevalence of non-carious lesions, gingivitis, secondary deformities of the dentition; detectability of teeth affected by caries, unsatisfactory oral hygiene, inadequate quality of fillings and endodontic treatment, as well as normalization of the tone and symmetry of the activity of the masticatory muscles, indicators of the Hamburg express test of the masticatory apparatus and indicators of computer analysis of occlusion.

Can Coronavirus Disease-19 Lead to Temporomandibular Joint Disease?

BACKGROUND: The coronavirus disease (COVID-19) has become pandemic spreading globally. The outbreak of COVID-19 has led to psychological problems and compromised the mental health of the people. Temporomandibular disorder (TMD) shows the pain and dysfunction of the masticatory apparatus. History of trauma, stress, psychosocial impairment, drinking alcohol, and catastrophizing are related to the TMD. AIM: We aimed to present some background information, in which COVID-19 may be correlated with TMD. METHODS: The outbreak of COVID-19 has led to psychological problems and compromised the mental health of the people. RESULTS: The outbreak of COVID-19 has led to psychological problems and compromised the mental health of the people, not those only who suffered from coronavirus but also to those in self-isolation, social-distancing, and quarantined. TMD shows the pain and dysfunction of the masticatory apparatus, and one of the major causes of TMD is stress and psychosocial impairment apart from drinking alcohol and history of trauma. Hence, TMD may be correlated with COVID-19. The consequences of anxiety, depression, and stress in people from the outbreak of COVID-19 may lead to TMD. CONCLUSION: Hence, COVID-19 may be correlated with TMD as one of the major causes of TMD is stress and psychosocial impairment.

Effect of treatment with a full-occlusion biofeedback splint on sleep bruxism and TMD pain: a randomized controlled clinical trial

Objectives The purpose of the present study was to analyze treatment outcome with a full-occlusion biofeedback (BFB) splint on sleep bruxism (SB) and TMD pain compared with treatment with an adjusted occlusal splint (AOS). Materials and methods Forty-one patients were randomly allocated to a test (BFB) or a control (AOS) group and monitored over a 3-month period. Output variables were frequency and duration of bruxing events (bursts) and various pain symptoms. Results The BFB group showed a statistically significant reduction in the frequency and duration of bursts and a statistically significant improvement in the patients’ global well-being and the facial muscle pain parameter. After the treatment was stopped, the BFB group showed a statistically significant reduction in the average and maximum duration but no statistically significant change in the frequency of bursts. Conclusions The tested BFB splint is highly effective in reducing SB at the subconscious level, i.e., without waking the patient, and in achieving improvements in global pain perception. The results suggest that the BFB splint also provides a better treatment option for bruxism-related pain than an AOS. However, further research is needed, and specifically studies with a larger patient population displaying higher levels of pain at baseline. Clinical relevance By reducing burst duration and therefore the pathological load on the masticatory apparatus, the BFB splint reduces TMD and bruxism-related symptoms and improves patients’ physical well-being. In the long term, this could prevent damage to the TMJ. This study confirms the effectiveness and safety of this splint. The universal trial number U1111-1239-2450 DRKS-ID registration DRKS00018092

Australian rodents reveal conserved Cranial Evolutionary Allometry across 10 million years of murid evolution

ABSTRACTAmong vertebrates, placental mammals are particularly variable in the covariance between their cranial shapes and body size (allometry), with the notable exception of rodents. Australian murid rodents present an opportunity to assess the cause of this anomaly because they radiated on an ecologically diverse continent unique for lacking other terrestrial placentals. Here we used 3D geometric morphometrics to quantify species-level and evolutionary allometries in 38 species (317 crania) from all Australian murid genera. We ask if ecological opportunity resulted in greater allometric diversity; conversely, we test if intrinsic constraints and/or stabilizing selection conserved allometry. To increase confidence in species-level allometric slopes, we introduce a new phylogeny-based method of bootstrapping and randomly resampling across the whole sample. We found exceedingly conserved allometry across the 10 million year split between Mus and the clade containing Australian murids. Cranial shapes followed craniofacial evolutionary allometry (CREA) patterns, with larger species having relatively longer snouts and smaller braincases. CREA is consistent with both intrinsic constraints and stabilizing selection hypotheses for conserved allometry. However, large-bodied frugivores evolved faster, while carnivorous specialists showed skull modifications known to conflict with masticatory efficiency. These results suggest a strong role of stabilizing selection on the masticatory apparatus of murid rodents.