Category: Laboratory Research
Award Category: Student Scientist
Evaluation of Biaxial Flexural Strength and Inorganic Composition of Simplified-shade Composites
Özge Dumana* (dtdumanozge@gmail.com) | Meriç Berkmanb | Mustafa Demircia | Safa Tuncera
aDepartment of Restorative Dentistry, Istanbul University, Istanbul, Türkiye
bDepartment of Restorative Dentistry, Bahçeşehir University, Istanbul, Türkiye
Objective: The present study aimed to characterize the inorganic composition and biaxial flexural strength of simplified-shade composites.
Methods: In this study six simplified-shade composites Omnichroma (Tokuyama, Japan), Vittra APS Unique (FGM, Brasil), Charisma Diamond One (Kulzer, Germany), OptiShade (Kerr, USA), G-aenial A’Chord (GC, Japan), Neo Spektra ST (Dentsply, USA) were evaluated. Filler particle composition and morphology were examined with energy-dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM), respectively. Flexural strength of the materials was tested with three- point bending test by using universal testing machine (Shimadzu Corp, Japan). One hundred bar-shaped composite specimens (n = 10) were prepared by placing them into a Teflon mold (25 mm length, 2 mm width, and 2 mm height) and polymerized with a light-curing device (Optilux 501, Kerr, USA).
Results: According to the three-point bending test results, the highest flexural strength values were obtained from Vittra APS Unique, and the lowest flexural strength values were obtained from Neo Spectra ST material. EDX tests showed that all composite materials contain high silica content. Charisma Diamond One, Vitra APS Unique, G-aenial A’Chord and Neo Spektra ST have high barium content.
Conclusion: Vittra APS Unique and Charisma Diamond One have high flexural strength due to their high filler content. Despite Neo Spectra ST's high filler content, low flexural strength was observed due to its pre-polymerized filler content.
Funding/Conflict of Interest: The present work was supported by Scientific Research Projects Coordination Unit of Istanbul University. Project Number: 38034
Keywords: biaxial flexural strength, SEM analysis, EDX analysis, simplified-shade composites
