Functional interaction of chewing muscles in children with dentoalveolar system anomalies

Relevance. The focus of modern dental treatment not only on the elimination of aesthetic, but also functional disorders requires an understanding of the functional conjugation of the chewing muscles, the possibility of interprognosis of parameters. Objective. Assess the functional relationship between the tone of the chewing muscles proper and the bioelectric activity of the temporal and sublingual muscle groups in children with anomalies of the dentoalveolar system. Materials and Methods. The study involved 36 patients of Childrens Clinical Dental Clinic No. 2 of Voronezh, aged 6 to 12 years, who had not previously received orthodontic treatment and had distal occlusion anomalies. Evaluation of the bioelectric activity of temporal and sublingual muscles was carried out using surface electromyography on the Electromyograph Dental apparatus (Taganrog, Russia), the Chewing General sample. Evaluation of the tone of the chewing muscles proper was carried out using the Mioton-3C device in a state of physiological rest of the lower jaw. Statistical processing was carried out using Microsoft Excel, version 7.0 and the statistical programs SPSS Statistics 21 and STATISTICA 7. Results and Discussion. Correlation analysis revealed the presence of 4 weak positive, 2 weak negative, 14 moderate positive, 3 moderate negative, and 1 noticeable positive correlation between the tone of the right chewing muscle proper and the parameters of the bioelectric activity of the right and left temporal and sublingual muscles. Correlation analysis revealed the presence of 5 weak positive, 7 weak negative, 9 moderate negative correlations between the tone of the left chewing muscle proper and the parameters of bioelectric activity of the right and left temporal and sublingual muscles. Conclusion. A greater effect of the tone of the right chewing muscle on the bioelectric activity of temporal and sublingual muscles was found compared to the tone of the left chewing muscle itself. 27 equations have been derived that can be used as predictive models for calculating the tone of right and left chewing muscles proper depending on the indicators of bioelectric activity of temporal and sublingual muscles.

DEVELOPMENT OF OCCLUSION

There are several reasons why pediatric dentist should understand the development of dental occlusion. One of the major objectives of orthodontic treatment is to correct occlusal problems. Much of the need for this treatment could be avoided if children received the proper dental care at earlier ages. Development of occlusion is a genetically and environmentally conditioned process, which shows a great deal of individual variations, and consequently, for the development of an acceptable occlusion, quite a remarkable co-ordination of different events is necessary. The development of occlusion depends on a number of conditions, like muscular pressure, habits, availability of space, etc. This development is coincident with the growth of all tissues associated with the dental apparatus, including the nose, maxillary sinuses, facial bones and muscles. Failure in one part of the development process may lead to anomalies, or else may be compensated for by other developmental processes. Thus Proper care of the developing deciduous and permanent teeth, both at the dental office and at home, is important for the appropriate development of occlusion. and timely diagnosis followed by appropriate interception can prevent any developing malocclusion. This article is an overview which depicts (1) periods of development of occlusion, (2) outline the development of normal occlusion in the pediatric patient and (3) explain what occlusion of the teeth is and why it is important.

Modeling stress-strain state of the section of human dental apparatus with the account of contact interaction between the teeth and their partial absence

Complex interaction of incisors of the multi-element system “jaw – tooth – periodontium – enamel – dentinˮ is considered in the present work. The model was created on the basis of tomographic images taking into account previous studies of the human dental apparatus for a simplified model of three molars. The aim of the work is to determine the stress-strain states of the “jaw – periodontium – tooth – dentinˮ system for a different number of incisors and their location using three-dimensional computer finite-element modeling. The results of the study allow obtaining a more complete and accurate assessment of the state of the human dentofacial apparatus as a whole and each of its elements separately in order to improve the technologies and methods of prosthetics.

Early Pleistocene faunivorous hominins were not kleptoparasitic, and this impacted the evolution of human anatomy and socio-ecology

Humans are unique in their diet, physiology and socio-reproductive behavior compared to other primates. They are also unique in the ubiquitous adaptation to all biomes and habitats. From an evolutionary perspective, these trends seem to have started about two million years ago, coinciding with the emergence of encephalization, the reduction of the dental apparatus, the adoption of a fully terrestrial lifestyle, resulting in the emergence of the modern anatomical bauplan, the focalization of certain activities in the landscape, the use of stone tools, and the exit from Africa. It is in this period that clear taphonomic evidence of a switch in diet with respect to Pliocene hominins occurred, with the adoption of carnivory. Until now, the degree of carnivorism in early humans remained controversial. A persistent hypothesis is that hominins acquired meat irregularly (potentially as fallback food) and opportunistically through klepto-foraging. Here, we test this hypothesis and show, in contrast, that the butchery practices of early Pleistocene hominins (unveiled through systematic study of the patterning and intensity of cut marks on their prey) could not have resulted from having frequent secondary access to carcasses. We provide evidence of hominin primary access to animal resources and emphasize the role that meat played in their diets, their ecology and their anatomical evolution, ultimately resulting in the ecologically unrestricted terrestrial adaptation of our species. This has major implications to the evolution of human physiology and potentially for the evolution of the human brain.

RELATIONSHIP BETWEEN PARAMETERS OF THE DENTAL APPARATUS AND RESPIRATORY ORGANS IN ORTHODONTIC TREATMENT

The dental apparatus and the respiratory organs of the skull are closely related. Respiratory tract defects lead to mouth breathing and abnormalities in the development of the dental apparatus. Elimination of dental anomalies does not guarantee against recurrence of dental diseases and encourages the improvement of methods of comprehensive examination and diagnosis. There are many methods for determining the transverse parameters of the facial skull: by diagnostic models or by frontal teleradiography. These methods do not always reflect the true position of the facial skull. We have proposed a method of measuring the transverse dimensions of the upper jaw and upper respiratory tract using computed tomography, which through the use of appropriate mathematical modeling can improve the diagnosis of respiratory organs and dental apparatus during orthodontic treatment. In the clinic of the dental medical center of the National Medical University. O.O. Bogomolets underwent orthodontic treatment of children with the first form of gnatal mesial occlusion according to Betelman. Treatment of mesial occlusion was performed using a fixed device for transverse dilation of the upper jaw. From the patients treated, we selected a group of 17 boys and 20 girls. Children aged 7 to 12 years had the first molars, clinically established 3rd or 2nd grade molar defects, congestion of more than 3 millimeters and nasal breathing problems. Before and after treatment with computed tomography, three distances of the upper jaw were measured: between the medial-palatine mounds of the first permanent molars, between the bones of the alveolar arch at the level of the resistance center of the first permanent molar, and between the cortical plates of the basal arch at the resistance center of the first permanent molars. In addition, three distances of the upper respiratory tract were measured: between the lateral points of the nasal walls at the level of the large palatal canals, between the lateral points of the nasal walls at the level of the large palatal canals and between the rudiments of the canines at the level of the pear-shaped opening. The results of changes in these parameters of the facial skeleton were subjected to statistical processing to determine the maximum and minimum values, mean, confidence interval. Testing the hypothesis of the normal distribution of sample data by the Shapiro-Wilk test showed that the frequency distribution of measurement data in the samples is close to normal. The closeness of the relationship between the parameters of the facial skeleton was assessed by the correlation coefficient and the adequacy of these coefficients - by Student’s criterion. As a result, there was no statistically significant dependence of the change in the distance between the medial palatine mounds of the first permanent molars on changes in the distances between the bones of the alveolar arch at the resistance center of the first permanent molar, between the cortical plates of the basal arch at the level of the center of resistance of the first permanent molars and the lateral points of the nasal walls at the level of the large palatal canals. It is shown that the change in the distance between the lateral points of the nasal walls at the level of the large palatal canals is statistically weakly related to the change in the distance between the medial palatal mounds of the first permanent molars and is not related to other parameters considered. Linear regression equations were constructed between the parameters of the change in the transverse dimensions of the facial skeleton. Verification of these models by Fisher's parameter showed their adequacy in general. Additional verification of the adequacy of the constant coefficients included in these models, according to Student's test, showed that the free member in the model changes the distance of the upper respiratory tract between the lateral points of the nasal walls at the level of the large palatal canals from the change in the distance between the cortical plates of the basal arch at the level of the center of resistance of the first permanent molars is not statistically significant. The rejection of the free term in this regression dependence led to an increase in the Fisher and Student criteria, which indicates an increase in the adequacy of this equation. The obtained regression equations allow predicting the change of some transverse dimensions of the facial skeleton depending on the change of others in the treatment of mesial occlusion and thus can improve the diagnosis of patients.

Causes and Severity of Dentophobia in Polish Adults—A Questionnaire Study

Introduction: A phobia is defined as an irrational fear, the intensity of which is inadequate to the circumstances, and it leads to the avoidance of situations that trigger it. A person with dentophobia avoids dental treatment, even when the pain in the teeth or oral cavity exceeds their fear. Fear and anxiety are the most common emotional states experienced by patients in dental offices. The aim of the study was to determine the following: the probable causes of dentophobia, which procedures patients fear the most, and the subjective feeling of fear on a point scale. Materials and Methods: The research was conducted in the form of an anonymous online questionnaire and its printed equivalent. The survey was available from 23 January to 16 March 2020, and it was addressed to adult respondents. In total, 130 respondents and 102 dental students took part in the survey. Results: It is worthwhile emphasizing that the main reason for dentist visits (for almost one-third of men and almost one-fifth of women surveyed) is a toothache. Periodontal problems (2.2%), tooth extractions (1.8%), and prosthetic consultations (0.9%) were relatively rare reasons for the respondents to visit a dentist. The vast majority of respondents see the cause of dentophobia as being related to their previous bad experiences. The second most frequently chosen answer is anxiety, which is caused by the sounds of dental apparatus. Conclusions: Pain is the most common reason given for fear of visiting a dentist, as well as the cause of dentophobia. Pain reduction can positively affect the frequency of visits to a dentist, thus, improving the condition of the oral cavity of patients.

Discrete-Event Simulation of the Triangular Relations of the Components of the Working Process of a Dentist Doctor in Endodontic Manipulations

Today in modern dentistry one of the urgent tasks is to increase the level of productivity of the dentist, while maintaining his or her mental and physical health. To find a rational solution to this issue, much attention is paid to ergonomics, which is aimed at protecting the work of doctors, improving the efficiency and quality of their work, creating optimal working conditions for them, ensuring safety and comfort for patients, and developing the latest dental equipment. The purpose of the study is to describe the clinical and experimental forecasting of the influence of ergonomics derivatives of dentists on the result of endodontic manipulations. Materials and methods. The methods, which were used, are targeted research methods, in particular Rapid Entire Body Assessment and Rapid Upper Limb Assessment, software Tecnomatix Jack (Siemens), StatPlusPro for Windows. The subject of research: a sample of 32 dentists (17 male dentists) (53.13%) and 15 female dentists (46.88%), who provide dental care on the basis of the University Dental Clinic, as well as in within other clinical bases of the dental faculty of Uzhhorod National University. Results and discussion. Analyzing the final results of iatrogenic interventions, there is a direct impact of ergonomics, justified by the presence of proven relationships between the integrated quality indicator of dental rehabilitation and procedural-manual-associated components of the treatment process. Non-compliance with the basic principles of ergonomics during various dental manipulations is evidence of changes in the pathological nature of the musculoskeletal system of the dentist, but there is still lack of data on the impact of the above changes on quantitative and qualitative indicators of effectiveness and predictability of treatment. Considerable attention needs to be paid to the analysis of the influence of ergonomic features of dentists' work on the result of endodontic treatment of teeth and their post-endodontic restoration, taking into account the initial complexity of this type of manipulation. As this is significantly influenced by anatomical variations in the structure of the endodontic, limited visualization of the working field, the need to ensure mandatory isolation of the intervention and permanent control over the absence of contamination of endodontic structures during treatment, topographic features of individual teeth (molars, in particular), features and physical characteristics of mechanical (rotational) and manual endodontic instruments. Conclusion. Occurrence of complications arising from endodontic treatment directly affect the prognosis of the dentition as a complex biomechanical system of the dental apparatus in cases of further post-endodontic restoration of teeth by direct or indirect restorations, as well as when using them as supports for future crowns, and also removable and non-removable types of orthopedic structures. In cases of fixation of bridges on endodontically treated teeth, the emergence of iatrogenic-associated complications due to biomechanical and biological properties of the endodontic, is associated with a decrease in the prognosis of success and survival of the entire prosthetic structure as a whole, rather than one independent unit of the tooth. Based on this, predicting the risks associated with the development of errors and complications during endodontic treatment, as well as their minimization through the use of various types of preventive measures remains an important scientific and practical issue not only therapeutic but also orthopedic dentistry

Regression models of teleradiographic indicators of the position of teeth and the profile of face soft tissues in ukrainian young men and young women with different face profiles according to Schwarz A. M.

Annotation. The needs of modern dentistry require constant improvement of research methods of human dental apparatus, parameters of craniofacial structures, determination of congenital and acquired deformities of the dental apparatus and improving the consequences of treatment. Diagnosis of orthodontic pathology is based on the identification of a large number of different indicators, which requires the use of mathematical analysis not only to processing of received parameters, but also to mathematical modelling individual cephalometric, gnatometric indicators, facial soft tissue parameters that affect its profile and aesthetics. The aim of the work is to develop and analyze regression models of teleradiographic indicators of tooth position and facial soft tissue profile indices according to A. M. Schwarz in Ukrainian boys and girls with orthognathic occlusion and with different facial profiles. Lateral teleroentgenograms (TRG) of 49 young men aged 17 to 21 years and 76 young women aged 16 to 20 years with a physiological bite as close as possible to orthognathic were analyzed. In the licensed package “Statistica 6.0” regression models of teeth position and soft tissue profile according to the A. M. Schwarz method are built depending on the basic cephalometric (1st group) and gnatometric (2nd group) indicators separately for young men and young women with different facial profiles according to A. M. Schwarz In young men, 21 of the 24 possible reliable regression models with coefficients of determination greater than 0.6 (R2 = from 0.736 to 0.999) were constructed. For young men with 2 face profile (straight face profile), the following models of all 8 indicators were built, and the coefficients of determination in the models of this group of persons (R2 = from 0.966 to 0.999) were the highest compared to the models of other groups of young men or young women. For young men with 3 face profile (front face profile), models were built for 7 indicators (except for the SnPog'-Pn angle indicator) with R2 from 0.736 to 0.983. For young men with 1 face profile (back face profile), such models were created for 6 indicators (R2 from 0.815 to 0.993) – in addition to the angle II and the angle SnPog'-Pn. A total of 18 models out of 24 possible were built for young women (R2 = from 0.736 to 0.999). In young women with 2 face profile, as well as in young men with this profile, models were constructed for all 8 studied TRG-indicators of tooth position and facial soft tissue indicators according to A.M. Schwarz (R2 = from 0.736 to 0.982), and for young women with 3 face profile – for 7 indicators (except for angle II) with R2 from 0.604 to 0.740. For young women with 1 face profile, the smallest number of models of the studied indicators was constructed in comparison with all groups of young men or young women with different face profiles – only 3 models out of 8 possible: for Sn-Pn distance (R2 = 0.828), Pog'-Por distance (R2 = 0.844) and the angle SnPog'-Pn (R2 = 0.982). Both young men and young women in the created models more often include indicators of 2nd group.

METHOD FOR DETERMINING THE DEGREE OF GINGIVAL INFLAMMATION IN THE UPPER AND LOWER JAW USING THE PMA INDEX IN CHRONIC GENERALIZED PERIODONTITIS IN PATIENTS WITH TYPE 2 DIABETES MELLITUS COMPLICATED BY PARTIAL SECONDARY ADENTIA

Особое место в структуре стоматологической заболеваемости занимает патология пародонтального комплекса, в частности - хронический генерализованный пародонтит, который по данным ВОЗ находится на втором месте по частоте распространения среди всех стоматологических заболеваний, уступая лишь кариесу. Первые признаки воспаления пародонта начинают проявляться уже в молодые годы, а к пожилому периоду - распространенность заболеваний пародонта достигает значений, стремящихся к 100%. Решение проблемы своевременной диагностики, профилактики и лечения патологии пародонта по-прежнему является актуальнейшей задачей современной стоматологии. Генерализованный пародонтит - это не только очаг хронической инфекции и источник сенсибилизации организма, но также ведущая причина потери зубов (особенно в старших возрастных группах), приводящая к серьезным деструктивным последствиям, дезорганизующим зубочелюстной аппарат. Данный факт способен серьезным образом повлиять на качество жизни человека, делая пародонтологическую проблему не только медицинской, но и социальной. Несмотря на очевидную актуальность данного вопроса, а также большой интерес к научным исследованиям в области пародонтологии, стоит признать, что уровень стоматологического здоровья, а также оказания пародонтологической помощи, в том числе пожилому населению - далеки от идеала. Во многом это объясняется сложностью этиологии и патогенеза заболеваний пародонта, а также, нередко, отсутствием комплексного понимания данной патологии при ее терапии A special place in the structure of dental morbidity is occupied by the pathology of the periodontal complex, in particular, chronic generalized periodontitis, which, according to the WHO, is in second place in terms of prevalence among all dental diseases, second only to caries. The first signs of periodontal inflammation begin to appear already in the young years, and by the old age the prevalence of periodontal diseases reaches values tending to 100%. Solving the problem of timely diagnosis, prevention and treatment of periodontal pathology is still the most urgent task of modern dentistry. Generalized periodontitis is not only a source of chronic infection and a source of sensitization of the body, but also a leading cause of tooth loss (especially in older age groups), leading to serious destructive consequences that disorganize the dental apparatus. This fact can seriously affect the quality of life, making periodontal problems not only medical, but also social. Despite the obvious relevance of this issue, as well as the great interest in scientific research in the field of periodontology, it is worth recognizing that the level of dental health, as well as the provision of periodontal care, including the elderly population, is far from ideal. This is largely due to the complexity of the etiology and pathogenesis of periodontal diseases, as well as, often, the lack of a comprehensive understanding of this pathology during its therapy

Management of the Sequelae of a Sport-Related Traumatic Dental Injury Using Ultrasound Examination in the Diagnosis and Follow-Up

About a quarter of all oral pathologies involving the oral cavity and dental apparatus are traumatic injuries, and a substantial number of these cases are the result of sports injuries affecting adolescents and young adults. Here, we report the case of a 25-year-old healthy female referred to the department of Endodontics for the evaluation and management of teeth 1.2 and 1.1 because of a chronic apical abscess in an area involved in a sport-related dental trauma in the past. A multi-modular diagnostic assessment, comprising conventional periapical radiographs, CBCT imaging, ultrasound, and histopathologic examination, led to a final diagnosis of an apical granulomatous lesion connected to both teeth, and an associated sinus tract. During the follow-up period of three years, the patient was reviewed twice a year and showed progressive healing of the bone and absence of the sinus tract. The present report shows the challenges of diagnosing complications arising from past dental trauma. Furthermore, it is the first documented traumatic case where ultrasound examination was fruitfully used. Emphasis should be put on introducing diagnostic ultrasound for the management of both apical periodontitis and the related sinus tract.