Nowadays the problem of optimal restorative prosthetics on dental implants is of paramount importance for solving a number of clinically difficult cases and extends beyond the alternative treatment at the complete and partial adentia both on the upper and lower jaws. An essential factor here is understanding of the biomechanical behaviour of the implant-abutment interface, because an optimal implant-abutment interface simulates the biophysical behaviour of natural teeth and ensures the long-term function of the prosthetic restoration. The optimal method for assessing the implant-abutment junction is the static tensile strength method. The limit is determined by performing a single loading of the dental implant in the implant-abutment area.
The aim of the study was to assess the implant-abutment deformation of demountable and non-demountable structures of the 4x10 cylindrical and cone-shaped dental implants with determination of their static strength limit.
Materials and methods. Two brands of dental implants have been chosen as the objects of research – cylindrical implant LIKO M 4x10 and cone-shaped implant LIKO M DG 4x10. A subject of the research is the ultimate strength of the implant-abutment unit of demountable and non-demountable abutment design.
Results. Static loading tests with estimation of the deformation limit of the implant-abutment unit were carried out along with the comparative estimation of the strength of demountable and non-demountable abutment constructions of dental implants of various shapes.
Conclusion. The carried out comparative analysis of the static strength makes it possible to optimise the process of prosthodontic treatment on dental implants taking into account the maximal limits of the loaded structures and to carry out the equilibrium load distribution.

The ethiological factor of periodontal diseases is the presence of periodontopathogens; in state of imbalance with commensals they begin to affect pathologically. With a decrease in the number of periodontopathogens in the biofilm, it is possible to restore the balance and prevent periodontal diseases or their transition to the stage of remission. Nowadays, the most informative and accessible diagnostic method for determining periodontopathogens is real-time polymerase chain reaction (PCR).

Introduction. The creation of effective, reliable, safe, technologically advanced and competitive products is the main task of medical device engineering. The most important requirement to modern medical devices is to guarantee patients’ safety during their lifetime. Today the use of modern computer-aided engineering analysis packages is the most effective calculation method for evaluating the strength and reliability of unique medical devices that can lead to serious consequences if their operation is disturbed. One of the most suitable and efficient systems for computer-aided engineering (CAE) system is the ANSYS software.
The purpose of this study was the comparative assessment of the elastic and elastoplastic formation of 4x10 dental implants of different designs on the abutment-pin and screw-body interface, using the computer simulation of the stress-strain state.
Materials and methods. Two kinds of dental implants were chosen for this study: a Liko-M 4 × 10 implant with the cylindrical body shape and a Liko-M DG 4 × 10 implant with a tapered body shape. The contact between the abutment and screw as well as the implant body and screw is frictional. The pre-tensioning of the screw from the initial tightening was 400 N. The load was applied to the cylindrical surface of the abutment at a percentage of its height.
Results. Elastic and elasto-plastic calculations of the stress-strain state of Liko-M 4 × 10 and Liko-M DG 4 × 10 implants were performed. Besides the results of the main calculations of the stress-strain state of the implants Liko-M 4x10 and Liko-M DG 4 × 10, necessary to assess their static strength, we have also calculated the strength coefficients of implant bodies. Comparative analysis of the static strength of the Liko-M 4 × 10 and Liko-M DG 4 × 10 implants provides conclusions, which are significant for practical application of the implants.

Soft tissue augmentation is a narrow direction in the reconstruction of the jaw bones, the number of techniques increases every year, while the issues of integrating flaps outside the axial type of blood supply remain relevant [1, 2]. The development of a minimally invasive method with the creation of an optimal blood supply will allow recreating the architectonics of soft tissue structures for a stable result and the subsequent possibility of bone augmentation with extended mandibular defects. Target. Clinical approbation of a vascularized palatal mucoperiosteal flap to eliminate the defect of the alveolar ridge.
Materials and methods. 42 patients underwent defect repair using a vascularized mucoperiosteal flap and 31 patients using standard free flaps.
Results and discussion. In the early postoperative period on the 12th day the restoration of soft tissue structures in a volume of at least 2 cm2, along the top of the alveolar ridge, a height of at least 16 mm, a thickness of at least 20 mm. One month after surgery, the height is not less than 15 mm, the thickness is not less than 20 mm, the volume is about 2 cm2. By the end of the third month, the indicators remained stable and corresponded to the previous figures, which indicates the absence of a shrinkage mechanism and the stability of soft tissue structures. 31 patients who have previously undergone augmentation using free grafts note a significant difference in the volume of the intervention and note its effectiveness in comparison with the previous one.
Conclusions. The use of a vascularized palatal mucoperiosteal flap is justified by its incomparable capabilities. After it’s taken, it is possible to restore soft tissues with an area of 3.5 cm2 or more. The risk of postoperative shrinkage is minimal due to adequate blood supply. Identical morphological characteristics of the oral mucosa are fundamental in solving aesthetic issues in dental implantation.

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.
Materials 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, finiteelement 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 limitations, 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