[Features of adhesion of anaerobic periodontopathogenic bacteria and Candida albicans fungi to experimental samples of basis dental plastic depending on surface roughness and polishing method].

AIM: Study the main surface parameters of milled polyacrylic materials using atomic force microscopy and primary microbial adhesion of periodontopathogenic group bacteria and Candida albicans fungi taking into consideration the method of sample polishing. MATERIALS AND METHODS: Studied samples: mill-treated without polishing (control); ergobox polished; polished in dental laboratory conditions; polished by a rubber brush in dentists' office. Microbial strains belonging to periodontopathogenic species (clinical isolates) that had been isolated from periodontal pockets of periodontitis patients: Porphyromonas gingivalis, Fusobacterium nucleatum, Streptococcus sanguis, C. albicans fungi were used for modelling experiments of primary adhesion of microbes to the material samples. RESULTS: S. sanguis had the highest degree of adhesion to polymer after milling, P. gingivalis, C. albicans--medium, F. nucleatum--low. A significant reduction of adhesion is observed during polishing in dental laboratory conditions or ergobox, less significant--during polishing in dental office. CONCLUSION: The data obtained allow to make a conclusion that the samples from polymer materials for preparation of prosthesis basis have varying degree of intensity of microbial adhesion of members of periodontopathogenic microflora and C. albicans fungi that depends on the polishing method, that accordingly determined the differences in colonization resistance against formation of microbial biofilm during polymer use in clinical conditions. . ,

[Optimization of implant and teeth retained restorations by two-step dental implantation].

Strength properties of provisional resin implant-retained restorations were assessed in vitro. The results were used to justify the use of combined temporary and two-step dental implantation.

[Feasibility and assessment of combined anti-inflammatory, antibacterial and immunocorrective treatment in periodontal disease].

The article presents the experience of using medical dressings of combined action based on antibiotic Spiramycin and antiseptic Triclosan. Investigation and treatment of 79 patients with moderate chronic periodontitis proved the given drug formulation to be highly clinically effective for local treatment of periodontal disease.

[Biofilm formation on temporary dentures: correlation of primary adhesion, coaggregation and colonization].

Forty-six patients (20 male and 26 female, age 45-76) with temporary dental prosthesis were followed-up both clinically and microbiologically. The results of quantitative and qualitative assessment proved biofilm formed on acrylic resin to be potentially more aggressive because of high incidence and significant number of virulent germs as well as yeast-like Candida fungal. Laboratory polished polyurethane samples showed much lower colonization by virulent germs and Candida fungal. After biofilm stabilization PCR revealed twice-fold less incidence of virulent germs on polyurethane when compared to other tested materials.

[Occlusion patterns of dental arches containing implant-supported restoration].

An experimental and clinical study was carried out on 76 patients with implant-supported restorations in the posterior zones of the lower jaw, divided in two groups (with no signs of bone resorption around the implants and with resorption signs) and one control group. The results of the study allowed optimizing the angulation of dental implants, providing an opportunity for individual positioning of dental implant in the mandible depending on the direction of functional load.

[Forensic medical diagnostics of chronic alcoholic intoxication based on the measurement of bone mineral density in the postcranial skeleton and periodontal complex].

The objective of this work was to develop forensic medical criteria for the diagnostics of chronic alcoholic intoxication based on the measurement of bone mineral density in the postcranial skeleton and periodontal complex. The stomatological status of 380 subjects was evaluated. Two hundred patients regularly consumed alcohol (group 1) and 180 ones practically did not use it (group 2). The stomatological status was evaluated based on the simplified oral hygiene index (OHI-s), the decayed, missing and filled teeth (DMF) index, periodontal index (P1) and the papilla bleeding index (PBI). Bone mineral density was measured by X-ray two-photon absorptiometry. The study demonstrated the relationship between variations of the stomatological status and alcohol abuse. Chronic alcoholic intoxication was associated with marked changes of the stomatological status and the loss of bone mineral density that correlated with the results of the orthopantomographic study. It is concluded that the above observations should be taken into consideration in the practical work of forensic medical experts as additional diagnostic criteria of chronic alcoholic intoxication and alcohol-related death.

[Comprehensive microbiological and molecular-biological control of using laser technologies in ambulatory surgical practice].

Results of comparative use of different type lasers for surgical treatment of patients with medium severity level of periodontitis were presented: group 1--erbium laser "Waterlaser Millennium" (41 people); group 2--diode laser "LS-0,97 - IRE-Polyus" (25 people); group 3--carbon dioxide laser "СО2-laser LST - 20/01 Lantset" (21 people). Patients of the comparative group undergone a traditional surgical curettage (30 people). A PCR-diagnostic was made to all patients that were sent to ambulatory surgical treatment. It revealed carriage of 1 to 4 types of periodontium pathogenic bacteria that present ed threat from the point of view of infectious complications development in the postoperative period. After using laser technologies an increase of periodontium pathogenic species eradication frequency was registered (А. actinomycetemcomitans, T. forsithia, P. gingivalis, P. intermedia, T. denticola): up to 60, 58 and 60%--for erbium, diode and carbon dioxide correspondingly.

[Comparative characteristics of angulometric parameters of teeth and dentitions in terms of personal identification].

Angulometric teleroentgenographic characteristics of teeth were compared for 158 subjects. A computer technology of calculation and assessment of 47 angular (quantitative) parameters characterizing spatial position of the teeth and jaws is proposed. This complex of parameters can be used as an additional test in personal identification.

[Assessment of unfavorable outcomes of dental care provoked by the patient].

Some causes of ineffective dental care because of the patient's negligence were analyzed. In 16 cases the patients ignored recommendations of the dentist and missed visits to the doctor. As a result, the patients developed complications leading to esthetic dissatisfaction, prolonged treatment, repeated prosthetic management.

[Optimal reconstruction of destructed teeth by pin constructions].

327 patients with dentures supported by 318 pulpless teeth reinforced by pin constructions were under observation. Main types of complications after pin use were identified. By math simulation the system "covering construction-artificial stump-root pin-root of the tooth" was studied for teeth 11, 13, 15, 16, 41, 43, 45, 46 in two projections--vestibulo-oral and mesio-distal. Margins of strength properties of teeth armed by special pin constructions (made as individual casting) and artificial stump with standard pins made of different materials were determined. Optimal parameters of height and width of off-root part and intra-root pin sizes in different teeth groups in conformity with their individual anatomic peculiarities were established.

[Experimental substantiation of parameters and strength characteristics of new endodontic-endoosseous implant construction].

Postoperative tooth stump is not able to endure usual functional loads adequately that leads to enhanced resorption of bone tissues surrounding root and loss of the tooth. Based on math computer simulation of mode of deformation of biomechanical model "metal-ceramic construction--endodontic-endoosseous implant (EEI)--stump of operated tooth--bone tissue of the jaw" new domestic EEI parameters were elaborated which improved greatly biomechanical properties of tooth with operated roots. Strength characteristics of new EEI were studied. A set of instruments for EEI was developed.

[The principles of designing stump pin inserts in pathological tooth abrasion]. / Printsipy konstruirovaniia kul'tevykh shtiftovykh vkladok pri patologicheskoi stiraemosti zubov.

A total of 278 patients aged 40 to 67 with pathological abrasion of hard dental tissues were treated. Decreased occlusion height was diagnosed in 152 (54.67%) of these. In 146 patients abutment teeth under permanent dentures were fixed with cast stump pin insertions. Complications occurred in 9.6% cases: perforation of the wall of the root canal (1.14%), failure of cementing (3.98%), fracture of the root (1.14%), breaking of a fragment of the root at the neck of the tooth (2.84%), and inflammations of the marginal periodontium (0.57%). In order to prevent these complications and improve the fixation of cast stump pin insertion, we used our modifications of cast stump pin insertions (n = 394) for anterior and lateral teeth. The incidence of complications decreased more than 5 times. Follow-up of 2 to 8 years showed 1.78% of complications.

[The prevention of complications from the use of cast stump pin inserts for the fixation of metal-ceramic dentures]. / Profilaktika oslozhnenii pri primenenii litykh kul'tevykh shtiftovykh vkladok dlia fiksatsii metallokeramicheskikh protezov.

A total of 186 patients aged 18 to 69 years with complications caused by metalloceramic dentures fixed on pulp-extracted teeth were studied. Major complications were: gingival retraction--21 teeth (9.81%), inflammation of gingival margins--24 (11.2%), inflammation of mucosa underlying the denture--29 (13.54%), full fracture of dental crown--34 (15.89%), loosening of the metalloceramic dentures--82 (38.32%), splitting of a part of dental root wall--24 (11.22%). The causes of the above complications were analyzed and preventive measures outlined.

[The correlation of the occlusal plane and the Frankfurt Horizontal parameters with the morphological and functional indices of the maxillofacial area in physiological dentition relationships]. / Korreliatsionnaia zavisimost' parametrov okkliuzionnoi ploskosti i frankfurtskoi gorizontali s morfologicheskimi i funktsional'nymi pokazateliami cheliustno-litsevoi oblasti pri fiziologicheskikh vzaimootnosheniiakh zubnykh riadov.

Anthropometric, functional, and teleroentgenographic examinations were carried out in 26 subjects aged 20-27 years with functional occlusion. Correlation of occlusion plane direction (OcP) with respect to the Frankfurt horizontal line (FH) and the dental, gnathic, and soft tissue parameters of the head and maxillofacial muscular functions was studied. The angle formed by the Frankfurt horizontal line and occlusion plate (FH-OcP) depends on the anthropometric angular and linear osseous parameters of the facial skull and soft tissue parameters of the face and with the functional status and coordination activity of maxillofacial muscles antagonists and synergists. It is noteworthy that the FH-OcP angle depends on the level of disposition and, which is still more important, on the direction of occlusion surface, and evaluation of individual OcP is the key to restoration of the morphofunctional harmony of the maxillofacial system during orthodontic treatment.

[The use of ceramic onlays for restoring the occlusal surface of the teeth]. / Primenenie keramicheskikh vkladok pri vosstanovlenii okkliuzionnoi poverkhnosti zubov.

Computer-aided milling of ceramic insertions helped more effectively repair the masticatory surface of teeth, minimize the incidence of errors, rule out the laboratory stage of making the insertions and the technological errors made at this stage, retain physical and mechanical characteristics of ceramics, optimize marginal adherence of the insertion to the tooth, retain the height of the lower part of the face, and thus prevent the maxillodental dysfunction.

[The mathematical modelling and computation of the stressed-deformed state of metal-ceramic dentures]. / Matematicheskoe modelirovanie i raschet napriazhenno-deformirovannogo sostoianiia metallokeramicheskikh zubnykh protezov.

The SPLEN-K (INZOMA) computing system, based on the mathematical model of a heterogeneous elastic body with linear plastic reinforcement helps estimate the design of coated dentures with due consideration for the individual features of the jaws and teeth, articulation, and occlusion. The open module type of this system permits its modifications and improvements, allows introduction of individual changes in the planned denture design, helps rapidly estimate the changes in the strained-deformed state and assess the correctness of the result from the computed data. The reliability of estimations was assessed in special tests. Practical results of theoretical studies are adequate to clinical and experimental data.

[Diagnosis of the temporomandibular joint dysfunction by graphic reconstruction of mandibular movements]. / Diagnostika disfunktsii visochno-nizhnecheliustnogo sustava na osnove graficheskoi registratsii dvizhenii nizhnei cheliusti.

A total of 974 patients with suspected abnormalities of the temporomandibular joint (TMJ) were examined; diseases were detected in 371 patients. The test group consisted of 40 patients, control group of 18 patients. Analysis of the results of graphic recording of mandibular movements and clinical x-ray data in patients of the main and control groups helped develop the strategy for the diagnosis of TMJ dysfunction, based on the functional methods of examination (oral functionography and non-oral axiography).

[Features of asymmetry of paired sizes of the lower jaw as applied to osteologic human identification]. / Osobennosti asimmetrii parnykh razmerov nizhnei cheliusti primenitel'no k zadacham osteologicheskoi identifikatsii lichnosti.

The article contains craniometric data of 50 lower jaws. An asymmetry of twin sizes of the lower jaw as applicable to the tasks of osteologic personality identification is evaluated.

[Correlation of x-ray cephalometric parameters of the gnathic part of the skull with dental anthropometric parameters and data of functional tests in subjects with normal occlusion]. / Korreliatsiia rentgenotsefalometricheskikh parametrov gnaticheskoí chasti cherepa s antropometricheskimi pokazateliami zubnykh riadov i dannymi funktsional'nykh issledovanii u lits s fisiologicheskoi okkliuziei.

Anthropometric, functional, and long-distance x-ray examinations of 26 subjects with normal occlusion (14 women and 12 men aged 20-27 years) were carried out in order to define the topographic and anatomical criteria for repair of maxillofacial harmony in case of lost occlusive checkpoints. Basic topographic and anatomical criteria of repair of the maxillofacial system in patients with lost occlusion checkpoints (level of position and direction of occlusion surface in the facial skull) were defined on the basis of long-distance roentgenograms of the head in the lateral projection. Individually determined occlusion surface is the key to repair of morphofunctional harmony of the maxillofacial system in patients with abnormalities complicated by decreased height of the lower segment of the face. A principally new concept of orthodontic treatment of patients with lost occlusion checkpoints by diagnostic topographic and anatomical criteria is suggested and a strategy of pathogenetic orthodontic treatment of this patient population has been developed on the basis of this concept.