[Experimental design of the lower jaw functional loading for implant-supported restoration in unfavorable clinical conditions]. / Eksperimental'noe modelirovanie funktsional'noi nagruzki nizhnei chelyusti pri protezirovanii s oporoi na implantaty v neblagopriyatnykh klinicheskikh usloviyakh.

THE AIM OF THE STUDY: Was to create a finite element design to evaluate the masticatory stress distribution on the full fixed prosthesis with three supporting implants and the mandibular bone in the conditions most closely resembling the real ones. MATERIALS AND METHODS: The geometric design was created with the results of a CBCT of a real patient. The transfer of the DICOM into STL format was carried out in the Mimics Medical 21 program, in which the author's splinting device for the implant was designed. The actual thicknesses of the patient's compact and cancellous bone layers were measured with Romexis ver. 4.5.1. Scanning of the artificial dentition was performed with the iTero Element 2 Version 1.7 which created an object in STL format. Design was performed in the package for finite element analysis Ansys 19.3. Tetrahedral elements of the second order were used for calculation. The structural elements were connected in the model by a rigid «Bonded¼ contact. RESULTS: A finite element model has been created for the experimental load design on the lower jaw for immediate implant restoration with few supports in combination with a device for stabilizing the implant in unfavorable clinical conditions. It is shown that the designed finite element model takes into account the biomechanics of the prosthesis with few supports. When calculating, the entire model was fixed to the mandibular process at its base, and was loaded with a force of 500 N, distributed over the teeth. The values of the maximum stresses obtained in the elements were 51.8 MPa for the compact layer and 245 MPa for titanium elements. CONCLUSION: Thus, we created personalized geometric and finite element models for calculating the distribution of functional load on a long full fixed implant-supported prosthesis with few artificial supports, which makes the experimental results more accurate and correct.

[Study of the effect of the occlusal surface of a natural tooth and fixed partial dentures supported by dental implants on the stress distribution by finite element analysis]. / Izuchenie vliyaniya okklyuzionnoi poverkhnosti estestvennogo zuba, iskusstvennykh koronok s oporoi na dental'nyi implantat na raspredelenie napryazheniya metodom konechnykh elementov s uchetom koeffitsienta treniya.

OBJECTIVE: To study the effect of the occlusal surface of a natural tooth, cement-retained and screw-retained fixed partial dentures supported by dental implants and the coefficient of friction on the stress distribution in the peri-implant bone at maximum and minimum principal stresses. MATERIAL AND METHODS: Study of maximum and minimum principal stresses in models with natural teeth and artificial crowns supported by dental implants, taking into account the coefficient of friction using the finite element analysis. RESULTS: In models represented by fixed partial dentures supported by dental implants and a natural tooth, the maximum tensile stresses arise in the cortical bone in the cervical region of the artificial crown, and the maximum compressive stresses occur both in the cortical layer in the cervical region of the artificial crown and in the cervical region of the tooth. In models with two fixed partial dentures supported by dental implants or two natural teeth, the stress distributions in the cortical layers in the upper and lower jaw are almost identical. CONCLUSION: Modeling the antagonist and adding to the FEA model is important in order to determine the precise and realistic direction of the resulting force vector. Amplification of the number of contact areas should be considered when modeling the occlusal surface of artificial crowns supported by dental implants.

[Influence of morphological parameters of natural teeth and fixed partial dentures supported by dental implants on the time of occlusion]. / Vliyanie morfologicheskikh parametrov estestvennykh zubov i nes"emnykh ortopedicheskikh konstruktsii s oporoi na dental'nye implantaty na vremya okklyuzii.

OBJECTIVE: To study the effect of morphological parameters of natural teeth and fixed partial dentures supported by dental implants on the time of occlusion. MATERIAL AND METHODS: The study of the morphological parameters of the first right upper and lower molars of natural teeth and fixed partial dentures supported by dental implants in the positions of the first molars of the upper and lower jaws, followed by determination of the relationship between the obtained data and the occlusion time using mathematical and statistical analysis. RESULTS: The study of the morphology of the occlusal surface of natural teeth and fixed partial dentures supported by dental implants did not reveal significant differences in the results of measuring the distances between the cusps of the upper and lower first molars, both natural teeth and fixed partial dentures supported by dental implants. However, the angles of the slopes of the cusps and the angles between cusps in natural teeth are sharper than those of artificial crowns. CONCLUSION: According to the correlation analysis in both groups, the relationship between the occlusion time and the morphological parameters of the lower molars was determined; the relationship between the morphological parameters of the upper molars and the occlusion time was not revealed.

[Development of an expert assessment of the quality of dental care]. / Razrabotka ekspertnoi otsenki kachestva stomatologicheskoi pomoshchi.

The article proposes a methodology for creating an assessment of the quality of dental care based on the use of the method of analysis of hierarchies and the theory of fuzzy logic. Approbation of the methodology was carried out on the assessment of the quality of dental services for the manufacture of metal-ceramic crowns. When conducting a new assessment, you can achieve a reduction in the time of its conduct by 6 times, increasing the number of evaluation criteria by 2 times and get results with a confidence factor (p=0.95). Evaluation allows you to combine existing descriptive, quantitative, radiological, functional assessments into a system and rank their significance for the final result. This allows assessing the quality of treatment more objectively.

[Adhesion of microorganisms to various dental materials used to form a gum contour in implant-retained restorations]. / Osobennosti adgezii mikroorganizmov k stomatologicheskim materialam, ispol'zuemym dlia formirovaniia kontura desny pri protezirovanii s oporoi na dental'nye implantaty.

The article the literature review on dental materials for the manufacture of gum formers used in dental implantology. Adhesion of microorganisms to titanium, PMMA and PEEK resins is discussed. According to published studies PEEK polymer is characterized by a similar bacterial contamination compared to titanium but shows lower degree of contamination when compared to acrylic resins in equal conditions.

[General strategy for the development of dental laboratories with CAD/CAM systems]. / Obshchaia strategiia razvitiia zubotekhnicheskikh laboratorii, osnashchennykh CAD/CAM-sistemami.

The need for the practice of dentistry in the digital (CAD/CAM) technologies have initiated the emergence of dental laboratories as a separate and independent legal entities. The choice of a strategy for the development of these laboratories is aimed at ensuring the achievement of the main goals in the long term. It is established that the type of innovation in terms of 'Shake test' J. Daya, in these organizations can be designated as an option 'C' - a strategy of gradual conquest of the market. The main components of the development are: work with staff, information support, financial optimization; material and technical support, marketing activities, organizational and legal support, the formation of the quality system.

[Compensation of moral harm caused by poor quality of dental care]. / Kompensatsiia moral'nogo vreda, prichinennogo v rezul'tate nekachestvennogo okazaniia stomatologicheskoi pomoshchi.

The study presents a review of the legislative regulation of compensation for moral damage in case of poor medical dental care and judicial practice according to the types of civil cases for 25 years as well as the main tendencies of existing court dental practice and the long-term trends.

[Legislative regulatory framework for medical care quality and safety control]. / Normativnaia pravovaia baza, reglamentiruiushchaia kontrol' kachestva i bezopasnosti meditsinskoi deiatel'nosti.

The paper presents the analysis of legislative and regulatory framework for the control of the quality and safety of medical activities. Legislative and regulatory framework requires mandatory internal control of the quality and safety of medical activities and dictates its structure. In the development of the internal control of the quality and safety of medical activities there is, however, a need to consider medical and social, legal, organizational, ethical and economic issues.

[Regulatory framework of the new wage payment system in dentistry]. / Normativnaia pravovaia baza novoi sistemy oplaty truda v stomatologicheskikh organizatsiiakh.

The paper presents the analysis of regulatory frameworks for wage payment system in federal, state and municipal dental clinics. The new wage payment system provided significant freedom for employers in payments size determination by regulation of basic, stimulating and compensative salary payoffs. The study highlights the need for scientific studies on dental care quality assessment criteria for wage payment system.

[Modern approaches to dental implants placement in deficient alveolar bone]. / Sovremennye podkhody k primeneniyu metoda dental'noi implantatsii pri atrofii i defektakh kostnoi tkani chelyustei.

The paper presents statistical data on implant placement procedures in Central Research Institute of Dentistry and Maxillofacial Surgery (Moscow, Russia) in 2010-2015. In 64% of cases inadequate bone volume was attributed to alveolar bone atrophy. Bone deficiency was equally often in upper and lower jaws (in 49.3 and 50.7%, correspondently) but varied in forms with complex configurations to be more specific for maxilla. The study also includes a series of clinical cases illustrating implant placement procedures in anatomically unfavorable settings.

[Cephalometric estimation of vertical dimension of occlusion]. / Opredelenie vysoty prikusa po rezul'tatam tsefalometricheskogo analiza bokovoi telerentgenogrammy.

The aim of the present study was to develop algorithms for determination of vertical dimension of occlusion on the basis of methods of cephalometric fnalysis suggested by different authors. Proposed methods of cephalometric fnalysis allow to additionally evaluate markers for vertical dimension determination in dental reconstructive treatment.

Implant-supported fixed cantilever prosthesis: the impact on bone stress deformity. / Konsol'nyi element v nes''emnoi ortopedicheskoi konstruktsii s oporoi na dental'nye implantaty: vliyanie na napryazhenno-deformirovannoe sostoyanie kosti.

Jaw fragment with complete absence of 3 teeth in the chewing area was simulated with masticatory loads corresponding to different types of antagonists: full dentures, partial dentures, intact teeth, implant-refained restavations. Simulated consoled elements of different lengths and sizes of dental implants. The analysis of the stress-deformation state of the teeth construction in the ANSYS program. As a result, it was found that with increasing length of the cantilever element 2 times - stress in the bone grows almost linearly. By reducing the diameter of the implant - is quadratic.

[Use of diagnostic templates at stages of prosthetics treatment with implant-retained restorations]. / Ispol'zovanie diagnosticheskikh shablonov na étapakh ortopedicheskogo lecheniia s primeneniem dental'nykh implantatov.

The comparative analysis of efficiency of various types of diagnostic templates for planning orthopedic treatment of 50 patients with partial or complete absence of teeth was performed. The patients were divided in 3 groups according to template manufacturing technique. All diagnostic templates made in accordance with clinical conditions allowed transfering digital data of the scheduled prosthetic construction for virtual implantation planning. Advantages and pitfalls of each template type are discussed.

[Marginal fit changes in implant-supported prosthetic bars by electroerosive processing].

The aim of the study was to evaluate the marginal fit changes in implant supported prosthetic bars by electroerosive processing. The experimental model included 9 bars supported by 2, 4 and 6 implant analogues (3 bars for each number of supports). Marginal gap size was assessed by digital microscopy before and after electroerosive processing conducted in 3 stages (10, 8 and 5 minutes long). Electroerosive processing proved to be useful tool for marginal fit correction.

[Study of blood circulation microdynamics in gingival mucosa after dental implantation with the use of custom-made healing abutments].

Microhemodynamics by gingival mucosa contour formation in implant placement sites was studied by laser doppler flowmetry. When installing healing abutment customized by Estelite Flow Quick noted reduction of tissue blood flow was revealed indicating the development of ischemia in the gingival mucosa. Conventional blood flow pattern restored in 7 days.

[A comparative study of mechanical properties of materials for custom-made impression trays used by implant-fixed restorations].

Materials for custom-made impression trays used for impression by implant fixed restorations were compared in the study. The analysis included such values as flexural strength and elasticity modulus, impression material adhesion strength with the use of adhesive and without it. Light-cured plastic Elite LC Tray had the best rates of bending strength and elasticity modulus and the Protakril M had the highest adhesion strength both with and without adhesive.

[Microcirculation dynamics in marginal gingiva by its contouring after second stage of dental implantation].

Microcirculation dynamics in marginal gingiva by its contouring after second stage of dental implantation was examined by means of laser Doppler flowmetry. After installation of the 5.5 mm flared healing abutments there was a significant reduction in tissue blood flow indicating severe ischemia in marginal gingiva. Efficient prosthodontic treatment caused beneficial impact on microcirculation.

[Study of physical-mechanic characteristics of prosthetic construction after their adjustment with the use of laser welding and hot metal adding].

Study of physical-mechanic characteristics of connecting joints of beam construction after laser welding and hot metal adding was performed. Increase of microhardness of joints as well as small reduction of bending strength of prosthetic constructions was established.