ИСТИНА

Purpose. Individualization of medical treat is a hot points of today’s medicine including implant dentistry. A computer simulation of the edentulous mandible restoration planning with implants placement under the scheme "All-on-4" was performed, based on evaluation of the stress-strain state of the components of the system under various loading conditions. Methods. Mandible CT was done with the dental tomograph Galileos (Sirona). Image processing, including segmentation, creation of a three-dimensional triangulated surface model and a tetrahedral grid, was carried out in the MIMICS program complex. The model obtained was supplemented with implants models and passed on to the finite-element complex ANSYS, where numerical simulation was carried out. Titanium implants 10-11 mm long and 3.5 mm in diameter were taken. Different loading schemes were considered, corresponding to central (biting) and one-sided (chewing) occlusion. Central occlusion was modeled by applying vertical load to two central implants. Results. Areas of stress concentration in the bone in all cases arose at the thread tops and carvings, and especially in the vicinity of the implant neck. Loading in the lateral part of the artificial dentition appeared more dangerous than in the frontal compartment. Conclusions. The technology presented makes it possible to take into account individual geometric and mechanical characteristics of the bone structures and tissues of a particular patient in the digital planning of implantation on the edentulous jaw. The work was done jointly with D.A.Gribov on the topic of state assignment (state registration number АААА-А17-117021310386-3) and with partial support of RFBR grants №17-08-01579 and №17-08-01312.