[Computed X-ray microtomography of the junction of dental implants with standard and custom abutments]. / Komp'yuternaya rentgenmikrotomografiya uzla soedineniya dental'nykh implantatov so standartnymi i individual'nymi abatmentami.

THE AIM OF THE STUDY: Comparative study of the precision of the junction of modern implant systems with standard and custom abutments. MATERIALS AND METHODS: The study was carried out by the method of computed X-ray microtomography on an X-ray microtomograph Heliscan micro CT using the ImageJ program in the laboratory «Systems for Microscopy and Analysis¼ of the Skolkovo Technopark. The measurement of the gap width between the implant and the abutment for each sample was carried out at 20 points according to the algorithm: the total length of the connection between the implant and the abutment; step (distance) between 5 equidistant points along the contact between the abutment and the implant; the measurements were repeated in 2 perpendicular sections along the joint node axis. The study was conducted on the example of seven implant systems common in Russia. The effect on the implant-abutment assembly of a multiple functional load of 250 N at an angle of 45° (7.6 million cycles) was studied. RESULTS: It has been established that the precision of the junction of modern implants with standard abutments is different and is characterized by the length of the contact from 268 to 1300 µm, the gap at the level of the platform from 5.0 to 11.7 µm, and the asymmetry of the contact in diameter by 2.4-14.2 µm. Abutments individually made in modern CAD/CAM laboratories do not have significant dimensional differences with standard abutments, but they have technological defects. The functional load expands and deforms the gap between the implant and abutment junction in the upper half of their contact. CONCLUSION: The results obtained demonstrate the capabilities of the computer X-ray microtomography method, which can be used to control the quality of manufacturing collapsible dental implants, the accuracy of manufacturing individual abutments in CAD/CAM laboratories, as well as in the development of new dental implant systems. The dimensional parameters of the junction node determine the advantages of the deep cone connection of the implant and the abutment.

[Comparative study of dental and psychological status in athletes of Olympic teams and the population of Moscow]. / Stomatologicheskii i psikhologicheskii statusy u sportsmenov olimpiiskikh sbornykh i naseleniya Moskvy.

AIM: To compare dental and psychological status in athletes of Olympic teams and the population of Moscow. MATERIALS AND METHODS: In order to study the features of the dental rehabilitation of Olympic athletes, a comparative study of the dental and psychological status of 132 athletes was carried out when they were included in the Olympic teams and 104 residents of Moscow of the same age. Clinical x-ray examination was supplemented by «Hamburg testing¼ of the masticatory apparatus and psychological examination using common questionnaires and scales. RESULTS: The study revealed a difference in the status of dental status, the results of the "Hamburg Testing" and psychological examination between athletes of the Olympic reserve and the population of Moscow of the same age. Athletes showed a lower quality of previous treatment of caries and its complications, insufficient oral hygiene, more frequent detection of chronic periodontitis, diseases of the oral mucosa, secondary deformations of the dentition, pathological phenomena of the temporomandibular joint, masticatory apparatus dysfunction according to the results of the "Hamburg Testing". Athletes also established psychological status features: higher rates of reactive and personal anxiety, the presence of depressive manifestations, lower quality of sleep and quality of life. CONCLUSION: The revealed patterns can provoke muscle hyper-tone and muscular-articular dysfunction of the maxillofacial region, which must be taken into account during the dental rehabilitation of athletes of Olympic teams.

Study of the Biocompatibility of Titanium-Niobium Implants by the Parameters of Their Osseointegration under Experimental Conditions.

Superelastic titanium alloys (titanium-niobium-zirconium and titanium-niobium-tantalum) are considered to be the more advantageous choice for dental implants than titanium alloys due to their physico-mechanical properties close to those of the bone tissue. Morphological studies of the biocompatibility of these alloys in comparison with titanium were carried out in vivo. Scanning electron microscopy and microprobe elemental analysis of the tissue along the interface between the bone and titanium/superelastic titanium alloys showed similar morphology and elemental composition both on days 30 (poorly mineralized connective tissue was detected in sites of contact with titanium alloy samples) and 90 after surgery (the surface of the titanium alloy samples was covered with mineralized tissue similar by its composition to the surrounding bone).

Experimental Study of the Biomechanics of Maxillary Implants under Conditions of Biomechanical Modeling.

We studied the stress-strain state of the bone tissue and maxillary full-arch fixed implantretained denture. Load was applied to the anterior (150 N) and posterior (250 N) parts of the denture supported by 6 or 4 implants, including zygomatic ones and placed by on-all-4 treatment technology. The obtained stress values in the bone tissue, implants, and denture show a large strength margin of structural materials. At the same time, the bone strength values were low, especially around the zygomatic and distal implants of all-on-4-implants-supported dentures when the posterior part of the denture was under load.

[The effectiveness of dentoalveolar anomalies treatment in children during early mixed dentition period]. / Éffektivnost' lecheniia zubocheliustnykh anomalii u detei v period rannego smennogo prikusa.

AIM: To analyze the effectiveness of orthodontic treatment in 7-9 years old children, dental status in children residents of Moscow was compared with 15-17 years adolescents with completed bite formation. MATERIAL AND METHODS: The adolescents were divided into two groups: those who received orthodontic treatment during the mixed dentition period and those who did not receive the treatment. A WHO survey chart was used to assess the dental status of children (WHO, 2013) with additional section 'Dentoalveolar anomalies'. DMFT and DMFT+dft, OHI-S, CPI, PAR, Little irregularity index and DAI were assessed in all groups. The need for dental and orthodontic treatment was calculated. RESULTS: Dental morbidity in Moscow children during the mixed dentition period was characterized by a high prevalence of caries (92.0%) with an intensity of 1.67±0.03, the 17.0% prevalence of premature teeth loss and dentoalveolar anomalies in 73.9% of children with a combination of anomalies in 60.8% of children. Orthodontic treatment in the mixed dentition period is associated with systematic professional control and by the age of 15 years results in two-fold reduction in the intensity of caries and periodontal disease, proper detection of poor hygiene and the lower prevalence of abnormal positioning of the teeth (crowding and misalignment of teeth) and the improvement of dental arches ratio (completely eliminating cross-bite). At the same time early orthodontic treatment has no significant effect on the prevalence of tooth rotation, interdental spaces, deep, open, distal, mesial occlusion and displacement of dental arches. CONCLUSION: Orthodontic treatment of children during the mixed dentition period is indicated in cases of crowding and displacement of teeth, as well as cross-bite; with respect to other types of dentoalveolar anomalies, early orthodontic treatment is only justified by the severe impact of dentoalveolar anomalies on psychological and functional indicators.

The cost of orthodontic treatment in children during the mixed bite period / Sebestoimost' ortodonticheskogo lecheniya u detei v period smennogo prikusa

In order to analyze the complexity and cost of methods of modern orthodontic treatment for children in the mixed bite period as well as to determine the necessary costs for eliminating dentoalveolar anomalies in primary school children taking into account the prevalence of anomalies we studied the duration and frequency of orthodontist visits during treatment using the 2x4 technique, a removable plate with artificial teeth, a ring with a spacer, a plate with a front bite pad, a plate with a shutter for the tongue, and Twin-block appliance, Dilar mask in combination with an expansion apparatus, plates with a screw, appliance with a hyrax expansion screw. Based on the complexity the salary of the orthodontist and other personnel, the costs of maintaining the doctor's workplace and the dental technician are calculated. The cost of consumables at the clinical and dental stages was determined considering the purchase prices and the cost of a specific manipulation by weighing or measuring. When calculating the necessary funding for early orthodontic treatment modern data on the prevalence and structure of orthodontic pathology in children during the mixed bite period were used. It was found that the complexity of modern orthodontic treatment during the mixed bite period varies from 5.55 hours (spacer with a ring for premature loss of a temporary tooth) to 10.73 hours in the treatment of a distal bite with a twin-block device. The cost of orthodontic treatment in mixed bite varies from 12.6 thousand rubles (a spacer with a ring for premature loss of a temporary tooth) to 33.4 thousand rubles for the treatment of a mesial bite using a Dilar mask in combination with an expanding device. Given the prevalence of dentoalveolar anomalies in children during mixed bite period, the necessary financial costs for orthodontic treatment per child examined should be at least 30 thousand rubles, and at least 40 thousand rubles for a child with a dentoalveolar anomaly.

[Guidelines for dental care in departmental sanatoriums for workers with hazardous working conditions]. / Obosnovanie reglamenta okazaniia v vedomstvennykh sanatoriiakh stomatologicheskoi pomoshchi rabotnikam proizvodstv s opasnymi usloviiami truda.

The aim of the study were protocols of dental care in departmental sanatoriums for workers with hazardous working conditions (HWC). Provided dental care and staff features were analyzed in 10 sanatoriums basing on their annual 2016 reports. In Central Clinical Sanatorium 'Malakhovka' dental care need was assessed in 402 males (mean age 39.2±1.2 years) with HWC. The study results were used for guidelines of departmental 'Dental care in resort rehabilitation of workers with hazardous working conditions'.

[Long-term results of dental health examinations of employees of industrial enterprises with hazardous working conditions]. / Otdalennye rezul'taty stomatologicheskoi dispanserizatsii rabotnikov promyshlennykh predpriyatii s opasnymi usloviyami truda.

The article analyzes the results of dental examination of employees with hazardous and normal working conditions in Atomenergomash enterprise with various dental care organization regimens and provides clear evidence of the effectiveness of serial attendances care in enterprise dental offices in terms of reduction in the dental treatment needs. Additional funding for departmental dental services was calculated by comparing the real cost of dental treatment and MHI tariffs allowing implementation of proposed dental care program.

[Cost-effectiveness analysis of professional oral hygiene].

Periodontal status and oral hygiene indexes were studied in 125 young employee of Kurchatov Institute. Oral hygiene values dynamic was assessed after professional oral hygiene in persons with unsatisfactory oral hygiene at baseline examination. When compared with the same values in the absence of professional oral hygiene procedures the results allowed calculating cost-effectiveness rate for biannual professional oral hygiene.

[Study of stomatological status in patients of dental implantological clinic according to the data of orthopantomography and computer tomography].

During examination before dental implantation with the use of orthopantomography (OPTG) and computer tomography (CT) stomatological status was studied in 242 patients of the Clinical stomatologic centre of FMBA, Russia. Indices of frequency and intensity of dental caries and periodontal disease were determined, as well as frequency of maxillary sinuses pathology, evaluation of the preliminary endodontic treatment quality was given, morphometric data governing frequency of indications to bone-plastic operations were presented. The advantages of CT over OPTG were shown during patients examination before dental implantations were maid.