Journal of implantology and applied sciences ISSN:2765-7833(Print) 2765-7841(Online) 대한구강악안면임플란트학회지

Hydroxyapatite (HA) can be successfully coated onto metal surfaces using a variety of methods. The purpose of this study was to evaluate the surface characteristics and dissolution behavior after an electron beam deposition procedure and subsequent heat treatment, and to investigate osseointegration by measuring the removal torque of the Ti-implants. Ti-6Al-4V alloy disks were used for in-vitro analyses and screw-shaped c.p. Ti-implants were used for in-vivo experiment. Group 1 was blasted with 75mm Al2O3. Group 2and 3 were blasted and coated with HA by electron beam deposition method(Group2), and group 3 was subsequently heat treated for 1 hour at 500℃inair. The implant surfaces were examined by an optical interferometer for the topographic analysis. The three groups of implants were installed in theproximal tibial metaphysis of 14 adult New Zealand White rabbits. After a six-week healing period, the implants were loosened with a torque- measuring device. The results showed that layers with a Ca/P ratio similar to that of crystalline HA(Ca/P=1.67) had better stability in a saline solution and the stability was further enhanced by heat treatment. This procedure increased the surface roughness and the torque required to loosen the implants.