ANALYSIS OF BIOCOMPATIBILITY OF MATERIALS FOR NON-REMOVABLE AESTHETIC PROSTHETIC STRUCTURES

Background. Currently, zirconium dioxide and metal-free ceramics are widely used in orthopedic dentistry. Studying the surfaces of these materials at the microand nanoscale is becoming increasingly important in dental research, allowing us to uncover the complex interactions between dental materials and oral tissues. Atomic force microscopy allows us to study the influence of microand nanoscale features of the surface of materials on bacterial adhesion, biofilm formation, and osseointegration processes. Contact angle analysis characterizes surface energy and hydrophobicity, which are the basis for models of protein adsorption, cell adhesion, and interaction of oral fluid with the surface of the teeth. Such studies prove the effect of wetting dental materials on their interaction with oral fluid, blood, and other biological fluids in the oral cavity. The main goal experimentally study and substantiate the biocompatibility characteristics of dental materials, namely zirconium dioxide, metal ceramics and press ceramics. Materials and methods. Studied the biocompatibility of aesthetic structural materials, such as zirconia, press ceramics, and metal ceramics, and their bio adhesion using atomic force microscopy (AFM) methods. The examined patients were divided into 2 clinical groups. The 1st group included 30 patients with aesthetic defects of the hard tissues, who were treated with generally accepted methods of manufacturing metal-free structures during orthopedic treatment. The 2nd group included 30 patients with aesthetic defects of the hard tissues, who underwent examination and orthopedic treatment with metal-free structures according to the proposed methods. Results. Zirconium dioxide and metal ceramics show similar values of the wetting angle, which indicates a similar value of surface energy. The contact angle for zirconium dioxide is 86.5 units. Press ceramics have a significantly lower wetting angle (40.7 units), which indicates higher surface energy and better wettability. The “PBI” (papillary bleeding index) in patients of group 2 after 6 and 12 months was significantly better than the index after orthopedic treatment in patients of group 1 the Silness-Loe hygiene index 6 and 12 months after orthopedic treatment was significantly better in patients of group 2 who received the proposed treatment and was 0.3±0.06 and 0.32±0.06 points. Conclusions. The use of non-removable structures based on zirconium dioxide and press ceramics helps to reduce the development of inflammatory processes in the tissues of the marginal periodontium, due to lower protein adsorption and cell adhesion. Clinical studies confirm the high clinical effectiveness of the use of non-removable aesthetic structures of prostheses based on zirconium dioxide and press ceramics, in particular, the RVI and Silness-Loe indices in patients of group 2 are significantly better than in patients of group 1 in the long term (after 6 and 12 months) after treatment.