Got S. Comparative assessment of the effectiveness of zirconium oxide and titanium abutments when replacing dentition defects after implantation.

The thesis is dedicated to the improvement of the prosthetic rehabilitation quality for patients using the method of dental implantation by comparing the application effectiveness of the abutments made of zirconium oxide and titanium. The research is done on the basis of the proposed methods in order to determine the state of periodontal tissues, the quantitative and qualitative compositions of microorganisms around the tooth, zirconium oxide and titanium abutments and to determine the intensity of the biofilm formation depending on the material type and surface characteristics, which are the keystone for the selection of the optimal abutments for the patients who undergo prosthetic rehabilitation after dental implantation.The presence of such factors as ineffective oral hygiene with the presence of the key pathogen in patients who have dental implants leads to the risk of mucositis, which is confirmed by the Spirman correlation analysis (p<0.05). A strong correlation between the patient's hygienic status and bleeding in probing (0.79) was determined. The results showed that the deterioration of hygiene around titanium abutments increases the number of Porhyromonas gingivalis (0.56) and total bacterial mass (0.43) (p<0.05), which was not found around zirconium oxide abutments (p>0.05). The number of key pathogens and total bacterial mass increases around titanium abutments and with increased bleeding (0.63 and 0.56, respectively). Correlation analysis found that as the number Porhyromonas gingivalis increases with the total bacterial mass around zirconia abutments (0.68).Compare analyses of the percentage of detected microorganisms in the polymerase chain reaction on the abutments in the second stage of the clinical study determined that the highest percentage of Porphyromonas gingivalis (85.7 ± 9.4%) was on titanium abutments. In general, the percentage of bacteria was higher on titanium abutments than on zirconium oxide abutments: Tannerella forsythensis (78,6 ± 11%), Treponema denticola (28,6 ± 12,1%), Candida albicans (28,6 ± 12.1%).