Clinical approbation of the use of dentures made of multilayer zirconium dioxide of domestic and foreign production after many hours and high-speed sintering

Relevance. New multilayer zirconium dioxide ceramic blanks with color and transparency gradients have been developed. However, at present, multilayer ceramic materials based on zirconium dioxide after hours and high-speed sintering have not been sufficiently studied in terms of the results of their use in clinical practice for non-removable dentures in the oral cavity. There was practically no comparative analysis of the effectiveness of cement and adhesive fixation of dentures made of multilayer zirconium dioxide.

The aim of the work is to study the clinical results of the use of nonremovable dentures made of multilayer zirconium dioxide ceramics from domestic and foreign manufacturers after traditional and high-speed sintering during cement and adhesive fixation.

Materials and methods. Dynamic clinical observation was carried out for 3 years for ceramic crowns made of multilayer zirconium dioxide of the Russian «Ziceram ML ET» and the Chinese «Aidite 3D Pro» production with a total of 55 on the lateral teeth of both jaws. Crowns from Ziceram ML ET were sintered using a multi-hour regime (9 hours) or an express regime (25 minutes). Crowns from Aidite 3D Pro were sintered only strictly according to the instructions for 12 hours. 45 crowns were fixed on glass ionomer cement, 5 crowns were fixed adhesive on Russian double-cured cement, 5 – on a similar cement from Linhtenstein. Regular examinations were carried out, the integrity of the crowns and antagonists and the hygienic condition of the prostheses were assessed.

Results. The observation showed no complaints from patients and no crown breakage. The amount of plaque was the same on ceramic crowns and natural teeth.

Conclusions. The study showed that crowns from «Ziceram ML ET» are not inferior to «Aidite 3D Pro» in strength and aesthetics. High-speed sintering of zirconium dioxide has shown efficiency. Clinical trials for prosthetics using «Ziceram ML ET» are recommended.

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