Dental  resin-based  composites  (RBCs)  have  been  widely  used  in  dental  treatment because   of   their   excellent   characteristics   such   as   aesthetic,   mechanical   and  biocompatibility properties. The aims of this study were to prepare and characterise the   resin-based  dental  composite  using  natural  hydroxyapatite  (NHA)  and  silica fillers.  The   effect  of  different  compositions  of  these  materials  on  the  properties  of dental   resin    composite   was   investigated.   RBC   was   prepared   by   varying   the composition of silica  (0, 5, 15, 20 wt%) in the filler mixture of NHA and silica. The ratio between fillers and organic  resins was fixed at 70:30 wt%. Two different ratios of organic resins of bisphenol A glycidyl  methacrylate (BisGMA)/triethylene glycol dimethacrylate   (TEGDMA)/hydroxyethyl   methacrylate    (HEMA)   were   used   i.e. 50:25:25 .....

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