Structural and mechanical properties of a giomer-based bulk fill restorative in different curing conditions

  • Mustafa Sarp Kaya Bezmialem Vakif University; Faculty of Dentistry; Department of Pediatric Dentistry
  • Meltem Bakkal Bezmialem Vakif University; Faculty of Dentistry; Department of Pediatric Dentistry
  • Ali Durmus Istanbul University; Faculty of Engineering; Department of Chemical Engineering
  • Zehra Durmus Bezmialem Vakıf University; Faculty of Pharmacy; Department of Pharmaceutical Biotechnology
Keywords: Dental resins, Fourier-transform infrared spectroscopy, Hardness tests, Polymerization


Objective: The main goal of this study was to compare the polymerization degree of bulk-fill giomer resin cured with three different light-curing units (LCUs): a polywave third-generation (Valo); a monowave (DemiUltra: DU); and a second-generation LED (Optima 10: Opt) LCUs by using structural and mechanical properties. Material and methods: Giomer samples of 2 and 4 mm cured with three LCUs were employed in vitro analysis. The degree of curing (DC%) was determined with Fourier-Transform Infrared Spectroscopy (FTIR). Microstructural features were observed with scanning electron microscopy (SEM). Flexural strength (FS), compression strength (CS), elastic modulus and fracturing strain were determined for mechanical properties. Surface microhardness (SMH) values were also measured. Oneway ANOVA, two-way analysis of variance and Tukey multiple comparison tests were used for statistically analyzing the FS and SMH. Results: DC% values were 58.2, 47.6, and 39.7 for the 2 mm samples cured with DU, Opt., and Valo LCUs, respectively. DC% values of the 4 mm samples were 50.4, 44.6, and 38.2 for DU, Opt, and Valo, respectively. SMH values were Valo, Opt


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