MECHANICAL and OPTICAL PROPERTIES of a NEWLY MARKETED UNIVERSAL COMPOSITE RESIN

Objectives: The purpose of this study was to evaluate the surface roughness, microhardness, color change and translucency of a newly marketed universal nanohybrid Composite Resin (CR) (Gaenial A’CHORD) comparing with four contemporary universal CRs including two nanofilled; Filtek and Estelite Asteria and two nanohybrid CRs; Charisma Dimond and Neo Spectra ST HV in vitro.
Methods: Sixty-five specimens (8.0 mm in diameter ×2.0 mm in height) were fabricated from 5 different universal CRs (n:13). After finishing and polishing, specimens were kept in distilled water for 24 h at 37⁰ C. All specimens were then subjected to surface roughness and microhardness tests. Color and translucency of the specimens were evaluated at baseline and after darkening with coffee solution at day 1 and day 7. A representative specimen from each group was investigated under Scanning Electron Microscope. Data was analyzed statistically (p<0.05).
Results: There were significant differences were among the groups in terms of surface roughness, microhardness, color stability and translucency (p<0.001). The highest surface roughness was recorded as: Charisma Diamond>Neo Spectra ST HV and Filtek> Estelite Asteria and G-aenial A’CHORD, whereas the highest Vickers Hardness number was as: Filtek and Charisma Diamond> Neo Spectra ST HV > G-aenial A’CHORD and Estelite Asteria. The highest color change was seen as: Charisma Diamond >Filtek, G-aenial A’CHORD, Neo Spectra ST HV, Estelite Asteria and the highest translucency was observed as: Neo Spectra ST HV > G-aenial A’CHORD and Filtek> EsteliteAsteria and Charisma Diamond. SEM examinations revealed smooth surfaces for G-aenial A’CHORD, Neo Spectra ST HV and Estelite Asteria.
Conclusions: Mechanical and optical properties of universal composite resins with different compositions showed variations. These results suggest G-aenial A’chord has good mechanical and optical properties and can enable high aesthetic restorations.