In this study, hydroxyaptite (HA) Ca10 (PO4)6(OH)2 nano size has been synthesized from waste materials (egg shell and
fish bone ) and then mixed with resin composite in order to measure the mechanical properties and linear shrinkage of
composite materials designed for dental restoration. The material was composed of visible light-curing monomer
(composan LCM) as a matrix and hydroxyapatite (nano particles) as a reinforcing filler at different ratios (5-10-
15wt%).The results show that the mechanical properties increases with added HA powder and up to 287Hv at the rate
15% of hydroxyapatite as well as the case for the compressive strength and the depth of cure to 130 Mpa and 2.65mm
respectively, while the linear shrinkage decrease to 0.097mm at 15% hydroxyapatite.