Dental implants are composed of two parts, a metal screw that is implanted in bone and the prosthesis that is attached to it. The most important key is for the metal screw to bond to bone early. Various coatings have been used to stimulate and enhance bone growth on implant surfaces.Hydroxyapatite (HA) is an inorganic calcium-containing component very similar to the mineral composition of human bones and teeth. A previous study demonstrated that HA formed on the surface of silicon dioxide, sodium hydroxide, titanium nitride and quaternized titanium nitride after immersion in simulated body fluid (SBF) for 30 days. This research study will expand on the previous study to determine the effects of time and gravity on HA deposition. The objective of this new research project will be to determine the rate of formation of HA at different time periods of 7, 14, 21 and 28 days between different coatings.