The popularity in dental orthopedic practice of fixed dentures with solid cast base has significantly improved the quality of replacement of defects of the teeth and dental rows. The adhesion strength of somatologic glass-ionomer cement for fixation to the natural tissues of the teeth is one of the important questions. Their solution helps to increase the effectiveness of patients treatment with fixed orthopedic dentures at the stage of their fixation. The adhesive strength of permanent cements depends both on the nature of the metal surface treatment and the chemical nature of the material used for fixation. The choice of a suitable dental glass-ionomer cement for the permanent fixation of the fixed dentures requires careful consideration, since their quality depends largely on its correct choice. With the appearance of new dental fixing materials that are widely available in the dental area, practical doctors need to have sufficient knowledge to select fixative cement for each clinical situation. The purpose of our investigation was to determine the adhesion of glass-ionomer cement for permanent fixation for hard tissues of supporting teeth. Material and methods. To determine the selected adhesion indices of glass-ionomer cements for permanent fixation (Ketas Cem, Germany; Riva, Australia and developed by us new glass-ionomer cement for permanent fixing by JSC Stoma, Ukraine), the study was performed on 60 examples (20 of each material). Results and discussion. The obtained results indicated that the adhesion of the dental material at rupture to the hard tissues of the supporting teeth of material "Riva" was 8.58±0.35 MPa; "Researched glass-ionomer cement" was 8.63±0.29 MPa; Ketac Cem was 7.89±0.24 MPa. The study showed that indicators did not differ significantly (p> 0.05). Conclusion. The adhesion indicators of glass-ionomer cement at shear indicated that the "Researched glass ionomer cement" indicator of 7.57±0.29 MPa 1.12±0.05 was greater than its counterpart material "Riva", whose limits were 6.45±0.24 Mpa. At the same time the "Ketac Cem" index (7.37±0.21 MPa) was 0.2±0.08 MPa less than the material developed by us. The data did not differ significantly (p> 0.05).

Keywords: glass ionomer cement, fixation, fixed dentures, physico-mechanical properties, adhesion, hard tissues of the supporting teeth

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