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

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Kaya M. S., Bakkal M., Durmus A., Durmuş Z.

JOURNAL OF APPLIED ORAL SCIENCE, vol.26, 2018 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 26
  • Publication Date: 2018
  • Doi Number: 10.1590/1678-7757-2016-0662
  • Journal Name: JOURNAL OF APPLIED ORAL SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Dental resins, Fourier-transform infrared spectroscopy, Hardness tests, Polymerization, POLYMERIZATION EFFICIENCY, RESIN, TEMPERATURE, COMPOSITES, CONVERSION, KINETICS
  • Bezmialem Vakıf University Affiliated: Yes

Abstract

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. One-way 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