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Purpose: The purpose of this randomized, controlled, one-centric, split-mouth clinical research is to compare the 1 year clinical performance of high viscosity glass ionomer restorations in impaired cervical lesions with nanohydrate composite restorations applied with three-stage acid and destroyer adhesive. In this study, 134 crude cervical lesions were divided into two groups in accordance with the design of divided oral work. The study used a high viscosity glass ionomer (Equia, GC, Alsip, Illinois, USA) as a experimental group; a nanohydrate composite (G-Aenial, GC, Tokyo, Japan) used as a control group with three-stage acid and deforestated adhesive system (Optibond FL, Kerr, Orange, CA, USA). The restorative materials were implemented according to the recommendations of the manufacturer companies. The clinical assessment was carried out 1 week, 6 months and 1 year after using the FDI criteria. The data was analyzed using Friedman 1-way and Mann-Whitney U tests (a = 0.05). Results: At the end of a year, there was no statistically significant difference between the two restorative materials in terms of all evaluation criteria, while the retention of high viscosity glass ionomers was 96% and the retention of nanohybrid composite was 100%. The clinical performance of high viscosity glass ionomer restorations, after a year of evaluation, was found similar to nanohydrate compounds in impaired cervical lesions. Keywords: High-viscosity glass ionomer, untouched cervical injury, nanohydrate composite THE PRELIMINARY EVALUATION OF CLINICAL PERFORMANCE OF HIGH VISCOSITY GLASS IONOMER RESTORATIONS IN NON-CARIOUS CERVICAL LESIONS: A 1 YEAR RANDOMISED, CONTROLLED TRIAL ABSTRACT Aim: The aim of this randomized, controlled, single-centre, split-mouth clinical trial was to compare the clinical performance of high-viscosity glass ionomer restorations in non-carious cervical injury in com-parison to nanohybrid composite restorations applied with a three-step & adhesive system. Material and Methods: A hundred and thirty four non-carious cervical lesions were included and assigned into two groups, according to split-mouth design. The cervical lesions of the experimental group were restored with a high viscosity glass ionomer (Equia, GC, Alsip, Illinois, USA); while a nanohybrid composite (G-aenial, GC, Tokyo, Japan) with a three-step etch & rinse adhesive system (Optibond FL, Kerr, Orange, CA, USA) was used for the control group. All tested restorative materials were used according to the manufacturers' instructions. Clinical evaluation was performed after 1 week, 6 months and 1 year using FDI criteria. Data were analyzed using Friedman 1-way and Mann-Whitney U tests (a = 0.05). Results: After 1 year, considering all criteria, there were no significant differences between the two restorative materials. However, high viscosity glass ionomer restorations revealed a retention rate of 96% in comparison to 100% of nanohybrid composite restorations. Conclusions: The clinical performance of high viscosity glass ionomer restorations in non-carious cervical lesions was found similar to the nanohybrid composites after 1 year of clinical service. Key words: High viscosity glass ionomer, non-carious cervical lesions, nanohybrid composite