Effect of aluminium oxide, titanium oxide, hydroxyapatite filled dental restorative composite materials on physico-mechanical properties

The effects of nano-hydroxyapatite in micro-aluminum oxide and titanium oxide on the physical, chemical, and mechanical characteristics of dental resin composite series (DHA and DHT) were investigated in this work. For each series, five distinct formulations were created by combining weight percentages (0, 2, 4, 6, and 8 wt%) of nano-hydroxyapatite. For each dental formulation, the amount of aluminium oxide and titanium oxide remained consistent (20 wt%). A statistical analysis was used for result analysis and the significance level was 0.05. The DOC of hybrid Al2O3-nHA dental composites was 77, 72, 66, 64, and 61%, while 74, 70, 63, 61, and 60% for hybrid TiO2-nHA dental restorative composites. The highest water sorption was found in DHT8 (28.83 mu g/mm3). The diminishing tendency was recorded in polymerization shrinkage and depth of cure. The higher compressive strength (201 MPa), flexural strength (92 MPa), and Vickers hardness (45 Hv) were found in the DHA8 dental composite. Superior results were observed in DHA than DHT dental composites.