Relevance. The majority of elderly and senile patients in the Russian Federation still use removable acrylic dentures, which is associated with the economic problems of the elderly. However, there are few studies devoted to the study of the effect of such dentures on the quality of speech function.
   Objective. Evaluation of quality of speech function in the patients with partial and complete tooth loss during the adaptation to the removable dentures including using by patients new home-made adhesive cream for denture fixation.
   Materials and methods. Overall 111 (33 male and 78 female) elderly patients with partial (63) and complete (48) tooth loss were examined and were divided into 4 study groups. Groups 1 and 2 included patients with partial tooth loss and groups 3 and 4 included patients with total tooth loss. There were also examined 17 elderly people who had no defects of dentition and formed a control group. The defects of dental rows in the patients of groups 1–4 were eliminated by making removable dentures. At the same time, during the adaptation period, patients in groups 2 and 4 of the study used a new domestic adhesive cream for fixing dentures. Before treatment and during the adaptation period, the quality of speech function of the patients was studied.
   Results. It was found that with preservation of the integrity of the dental rows in the elderly people a high quality of speech is observed. Loss of teeth leads to a decrease in the quality of speech function, especially in patients with partial loss of teeth in the anterior part of the jaw or front teeth on both jaws. By the middle of the adaptation period, the quality of speech function had improved in all patients examined, both with partial and total tooth loss. Use of the adhesive cream by patients provided a reliably better quality of speech function with partial and full removable acrylic dentures, which was characterised as «high» at the end of the adaptation period.
   Conclusion. On the basis of the conducted research, home-made adhesive cream for denture fixation can be recommended to patients with the purpose of optimization of the adaptation period to removable acrylic dentures as well as for permanent use, which will improve not only fixation and stabilization of dentures, state of the prosthetic bed mucosa, but also the quality of speech function.

   Competent oral care in a regular format with properly selected hygiene products reduces the risk of dental caries and leads to a decrease in the incidence of common diseases. A large number of different hygiene products from many countries and manufacturers are represented on the dental market. In the scientific literature there is a confirmation of their action, advantages or disadvantages. However, much less attention has been paid to their correct and timely use, especially in childhood.

   The aim of our work was a clinical evaluation of the anti-caries efficacy of commercial samples of toothpastes with various active substances (fluoride-free mineralizing complex and NaF).

   A year and a half program of controlled, motivated brushing of teeth involved 90 students of the 1st grade of schools in Izhevsk, the seventh year of life (from 7 to 11–12 years old junior schoolchildren). The number of boys and girls was equal. The use of PRESIDENT children’s toothpastes in a one and a half year program of controlled brushing of teeth led to a decrease in the OHI-S index by 59–63 %, a decrease in the GI index by 53–58 % and a reduction in the increase in the intensity of dental caries by 28–44%.

   Introduction. The development of new dental implants in the context of the booming domestic industry makes it possible to find alternative options in the treatment of clinically difficult situations, to select the necessary individual solution during dental implant surgery, and consequently, to perform the surgery in an error-free manner and achieve the desired results. The development of a dental implant is a multistep process, and the characteristics of the implant material and its biophysical characteristics must be studied in detail until the implant is integrated into the bone tissue.
   The aim of the study: to estimate the opportunities and prospects of applying the finite elements method by developing the new systems of dental implants according to the literature data.
   Material and methods. A search was carried out in the national digital libraries e-library, CyberLeninka, as well as PubMed, Medline, Web of Science and Google Scholar using the following keywords: dental implant, finite-element analysis, mathematical model. Sixty-nine papers were selected and analysed.
   Results. The finite element method is an accurate method to analyse the implant being developed, but it has certain limits, because in the finite element mesh, the implant-bone interface is a continuous relationship. The absence of micro-movement at the implant-bone interface during loading is different from the actual clinical situation. The expected 100 % osseointegration based on 3D-modelling can’t be an ideal option and never corresponds to the reality in the clinical situation. However, the use of the finite element method makes it possible to test single loads and inclination angles, which in the clinical situation is very rare.

   The profession of ballet dancers is always associated with excessive physical exertion, which in turn leads to increased muscle tension in all parts of the body, including the muscles of the facial skeleton. This, in turn, can lead to injuries and increased abrasion of the hard tissues of the teeth and, as a result, to various occlusive disorders. Against the background of an excessively busy training schedule, a ballet dancer may lack time for oral hygiene. All of the above can affect the level of oral hygiene and the condition of the hard tissues of the teeth.
   The purpose of the study is to improve the efficiency and quality of dental care for ballet dancers of various age groups based on the identified features of oral hygiene and the condition of hard dental tissues and the need for dental treatment.

   Materials and methods: 75 ballet dancers were assessed for oral hygiene OHI-S and tooth erasability, determination of the area of occlusal contacts and registration of supracontacts.
   Results and conclusions: the age and work experience of a ballet dancer directly affects the level of oral hygiene and the condition of the hard tissues of the teeth. Ballet dancers have average satisfactory and high unsatisfactory indicators of the level of oral hygiene, as well as increased tooth abrasion and occlusive disorders of varying severity.

   The aim of the work was to study the antioxidant efficiency of anodic dissolution of silver-copper and copper electrodes, cases of near-canal endodontic effects in Tocom disease, in relation to mixed cultural transgenic pathogens infected with root diseases when examining chronic forms of pulpitis.
   The results of the study showed that the anodic dissolution of both silver-copper and copper electrodes has a pronounced and, in general, unidirectional antibacterial effect. It was found that the anodic dissolution of the copper electrode showed a more pronounced effect on mixed cultures of pathogenic microorganisms S. constellatus + F. nucleatum and Streptococcus sanguis + Enterococcus faecium. The data obtained indicate that in apex-phoresis in teeth with partially obliterated root canals, along with anodic dissolution of silver-copper electrodes, anodic dissolution of copper electrodes can be used.

   Neuropathy of the inferior alveolar nerve (IAN) is one of the urgent problems of dentistry and neurology. The article is devoted to the issues of early and late diagnosis of neuropathy IAN by clinical, radiological and functional diagnostic methods. Evaluating the study of 22 patients over the course of a year, we came to the conclusion that early diagnosis is the most informative and qualitative. In this regard, the development of a diagnostic technique for neuropathy IAN will reduce the time and improve the quality of treatment, as well as significantly reduce the consequences of complications.

   Relevance. Currently, a significant increase in diseases of the oral mucosa, manifested by inflammatory and destructive lesions, has been revealed. To determine the correct tactics for the treatment of inflammatory and destructive lesions in lichen planus, it is necessary to comprehensively assess the situation in the oral cavity, taking into account planimetry data, the size of the inflammatory background, the presence of exudate, the severity of pain syndrome, and also include criteria for the stages of the lesion in the evaluation system, which requires a personalized and differentiated approach to patient management tactics.

   The purpose of this work was to develop and substantiate a hardware and software complex for the diagnosis of diseases of the oral mucosa.

   Materials and methods. The study involved 34 patients with erosive and ulcerative form of lichen planus. The patients were diagnosed with pathological elements of the oral mucosa using the developed hardware and soft-ware complex. Pain was determined (in points), the area of inflammation, the area of fibrinous plaque, the total area of the lesion for 14 days. Assessment of the stages of the pathological process contributed to the differentiated appointment of pharmaceuticals. According to the results of the clinical examination, the effectiveness of the hardware and software complex for the diagnosis of diseases of the oral mucosa has been proved and justified.

   Conclusion. During the study, it was reliably proved that the use of a hardware and software complex is advisable to include in the algorithm of examination of patients with diseases of the oral mucosa. No side effects and complications were detected. When drawing up a treatment plan, it is necessary to approach each patient individually, depending on the clinical situation.

   The article presents a study of bone mineral density by DEXA and evaluated the effectiveness of correcting therapy using vitamin D by quantitative ultrasound densitometry to increase the effectiveness of the treatment of patients with dental defects in the background of systemic osteoporosis by dental implantation.
   Materials and methods: 619 people were examined by quantitative ultrasonic densitometry. The dynamics of changes in bone mineralization was studied with an interval of six months and 1 year. A comparative analysis of the average values of quantitative ultrasonic densitometry was carried out at various times after the installation of dental implants in the control and main groups.
   Results. Sound velocity values in patients with normal bone mass were (4203,3 ± 7,9). In patients with osteopenia, the rate of ultrasound in bone tissue was 3992,2 ± 3,6 (p < 0.001); in patients with osteoporosis 3802,7 ± 14,9 (p < 0.001). All these parameters were obtained after the use of corrective therapy with vitamin D3.
   Conclusions. The analysis of the results of quantitative ultrasound densitometry revealed that in the group of patients with osteoporosis, the indicators were reduced by an average of 9.5 % compared with patients with normal bone indicators (p < 0.001).

   Promising scientific research in modern dentistry and maxillofacial surgery is focused on solving the issues of long-term and stable results of implant treatment in the rehabilitation of patients with partial or complete absence of teeth in conditions of deficiency of the soft tissue component of the alveolar ridge. Clinicians have proposed a variety of plastic surgery techniques, in which soft tissue defects are simultaneously replaced with a vascularized flap, a revascularized autograft, or by stage-by-stage replacement of a defect with a pedunculated flap, followed by its cut-ting off and modeling, taking into account the individual characteristics of the formed area. The long-term clinical success of dental implantation is largely determined by the functional state and reactive properties of the soft tissues surrounding the implant, which play an important role not only in achieving a highly aesthetic result, but also in preventing complications of implant treatment. The use of an operative multi-stage method for reconstructing the soft tissue component of the alveolar ridge with a mu-coperiosteal vascularized flap from the bone palate, developed on animal biological dummies (pigs), allows you to pre-plan the volume of surgical intervention, as well as the shape of the donor and recipient zones. Topographic and anatomical substantia-tion of the optimal modeling of the mucoperiosteal flap from the bone palate will al-low avoiding excessive donor tissue sampling, minimizing the invasiveness and trauma of surgical intervention, forming a soft tissue buffer zone of the required vol-ume to prevent bone resorption in the peri-implant area, increase the service life of dental implants, increase the reliability of prosthetic designs and long-term operation.

   In surgical dentistry, the sampling of the biomaterial of the jaws is usually carried out with the help of dental trepans. As a result of osteotomy, a friction force inevitably arises during trepan biopsy, which can lead to local hyperthermia and, as a consequence, coagulation necrosis of both the bone tissue of the jaw itself and damage to the resulting biopsy. Local overheating can lead to complicated healing of a bone wound in the area of a trepan biopsy, lead to difficulties in verifying the morphological picture of the disease and, as a consequence, further treatment of the patient. When conducting a navigational trepan biopsy using a surgical template, the risk of hyperthermic exposure increases, and the question of choosing the rotation speed becomes obvious. The literature presents limited data on osteotomy regimes using a trepan cutter during jaw bone biopsy, including using a navigational surgical template, which determined the relevance of the study.
   The purpose of the study: to determine the permissible speed of rotation of the trepan cutter during the navigation trepan biopsy of the jaw bones.
   Materials and methods: 20 (5) micro-preparations were made from trepan biopsies of the femur of cattle, obtained at speeds of 800 rpm, 500 rpm, 250 rpm, 50 rpm in the classical way; 15 (5) micro-preparations were also made from trepan biopsies obtained at speeds of 350 rpm, 200 rpm, 50 rpm using a surgical navigation template. The width of pathological changes in the tectorial properties of ostein due to coagulation damage of the bone matrix in microns was measured using SlideViewer (3DHISTECH), a built-in tool for measuring linear parameters in microns. The statistical significance of the obtained values was determined using the Kraskel – Wallis H-test.
   Results: with osteotomy at a speed of 50 rpm, the width of the bone matrix damage reached up to 10 microns. As the rotation speed increased, the width of the damage also increased: at 200 rpm – Me = 36.8 microns, 350 rpm – Me = 98.6 microns.
   Conclusion: when conducting a navigational trepan biopsy using a surgical template, the recommended rotation speed of the instrument is up to 350 rpm.