Comparison of Microhardness and Surface Roughness of New Nanofiber Filled Flowable Composite

Objective: This study aimed to compare the microhardness and surface roughness (Ra) of a resin composite, which was recently introduced to be the first flowable composite with the nano-sized fiber filler, with the particle filled composite resins with different properties, used in Class V cavities.Methods: Totally 100 disc-shaped samples (diameter: 4 mm, height: 2 mm) were prepared and divided into five groups in accordance to the different types of composites (n=20): 1) Flowable composite with nano-fiber filler (Group N: NovaPro Flow, Nanova, USA); 2) Flowable bulk-fill composite [Group Estelite Bulk Fill Flow (EBF): Tokuyama, Japan]; 3) Flowable composite [Group G-aenial Universal Flo (GUF): GC Corp, Japan]; 4) Highly-filled flowable composite [Group G-aenial Universal Injectable (GUI): GC Corp, Japan]; 5) Micro-hybrid composite (Group Z250: Filtek Z250, 3M ESPE, USA).They were polished with aluminum oxide polishing discs.Ra measurements (m) were made using contact profilometer (MarSurf M 300 C; Mahr GmbH, Germany) (n=10).Vickers microhardness evaluations were made using HMV microhardness tester (Shimadzu, Japan) (n=10).Three dimensional (3D) optic profilometer was used to evaluate the surface topography.One-way ANOVA, Shapiro-Wilk and Tukey tests were used for statistical analysis (p<0.05).Results: At top and bottom surfaces, Group N showed significantly lowest microhardness values while Group Z250 showed significantly highest microhardness values than other groups (p<0.05).Group GUI showed significantly higher microhardness values than group Z Ama: Bu almada, nano boyutlu fiber dolduruculu ilk akkan kompozit olarak yakn zamanda piyasaya srlen bir rezin kompozitinin mikrosertlik ve yzey przllnn (Ra), Snf V kavitelerde kullanlan farkl zelliklere sahip partikl dolduruculu kompozit rezinlerle karlatrlmas amaland.