IMPROVED DESIGN OF TEMPORARY PROSTHESIS FOR THE BONE AUGMENTATION AND TWO-STAGE DENTAL IMPLANTS OSSEOINTEGRATION PERIOD.

The study was performed on 21 edentulous patients, treated during the period of 2017 - 2018 at the Surgical Dentistry Department at the Moscow State University of Medicine and Dentistry. The patients underwent the procedures of bone augmentation, dental implant placement, and placement of various design temporary dentures for the periods preceding the placement of the permanent implant-supported dentures. The authors have developed and implemented a medical-prophylactic device - an acrylic partial denture supported by temporary dental implant and Klammer fixation on the existing crowns in front of the edentulous area. The results of the use of the device during the post-operative period were analyzed and compared to those of traditionally designed removable partial devices. The comparative analysis has shown that the medical-prophylactic device is superior to the temporary removable partial dentures and vacuum-formed retainers.

PECULIARITIES OF THE OCCLUSION FORMATION IN DENTAL IMPLANT SUPPORTED ARTIFICIAL TEETH.

The aim of this study was to assess and develop an effective computer technology assisted method for improved treatment of dental implant patients. Both an experimental and clinical assessments were conducted. The experimental part was performed to develop the mathematical models for calculating and analyzing the tensely deformed condition (TDC) in the system "non-removable prosthesis - dental implant - lower jaw " (PIJ). Clinical study was conducted on 76 patients with previously placed dental implant supported prostheses in the posterior parts of the lower jaw (with and without signs of bone receding around the implants) allocated into three groups. Results of the study allowed the authors to suggest an effective computer technology supported method for assessing the required angles of dental implants, which provides an opportunity for individual calculation of the dental implant in the bone of the mandible depending on the direction of functional load.

NON-REMOVABLE DENTURE PROTOTYPES, EFFECTIVE IN DENTAL IMPLANTATION.

Temporary prosthesis transformed into a prosthetic prototypes and manufactured by CAD/CAM technologies (computer copy milling) are used to specify the final form of future permanent restoration and to correct occlusal relationships, vertical size of non-removable dentures, and their occlusal surfaces. A progressive loading on bone tissue in the implantation area and soft tissues formation, have been assessed. In this regard, the choice and placement of temporary mini-implants, as the supports for non-removable denture prototypes for the period of osseointegration of two-stage intraosseous dental implants, are the issues of great importance. Temporary dental implants are the object of complex loads of different magnitude, duration and direction. The action of the prosthesis is closely related to load delivery to the surface of dental implant between the components of the system - "implant-temporary prosthesis". According to the study results, minimization of the momentum acting on temporary implants in the mesiodistal direction allows reducing stress level in the areas of permanent implant placement.