This  study aimed  to  prepare and  characterise  dental  resin  composite with hydroxyapatite-yttria stabilised zirconia (HAp-YSZ) fillers from natural and synthetic sources of  hydroxyapatite (HAp). The yttria stabilised zirconia (YSZ) and HAp were used as reinforcement  inorganic fillers, while the organic resin were the blended monomers of bisphenol A glycerolate  dimethacrylate (Bis-GMA), triethylene glycol dimethacrylate (TEGDMA) and diurethane dimethacrylate  (UDMA). The composites were thoroughly blended at ratio of 70:30 wt/wt of fillers and resin. The  mixing ratios of fillers (YSZ:HAp) were fixed at 0:100; 10:90; 25:75; 50:50 and 75:25 wt/wt. The  composites were moulded and crosslinked under UV-light for 60 s on the both sides of samples  surfaces. The degree of conversion, flexural strength (FS), compression strength (CS), Vickers  hardness (VH), surface roughness (SR), water sorption, water solubility and cytotoxicity of  composites were measured.....

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