| Penulis/Author |
EKO PUJIYANTO (1) ; Prof. Ir. Alva Edy Tontowi, M.Sc., Ph.D., IPU., ASEAN Eng. (2); Ir. M. Waziz Wildan, M.Sc., Ph.D., IPU (3); Prof. Dr. drg. Widowati Siswomihardjo, M.S. (4) |
| Abstrak/Abstract |
In the present study, hydroxyapatite was synthesized from local gypsum by microwavehydrothermal method. Different percentage amounts of zirconia (0, 20, 30 and 40 wt.%) and polymethyl methacrylate (40, 50 and 60 wt.%) mixed with hydroxyapatite (HA) for six hours. These powder mixture were deposited using deposition machine to produce specimens. These specimens were sintered at a temperature of 140oC with holding time for 1 hour into the green parts. These green parts were sintered at temperature of 1450oC with holding time for 2 hours. This process produces porous hydroxyapatite-zirconia composites with porosity between 62.76-73.92 percent. These composites were examined by XRD, XRF, SEM-EDX, BET analysis and compressive strength testing. Compressive strength of porous hidroxyapatite-zirconia composite decreased from 3.706 to 0.039 MPa when percentage amounts of zirconia increased up to 40 wt.%. This caused by several factors i.e. increased porosity, grain zirconia cracked, zirconia reacted with HA to produce CaZrO3, β-TCP and α-TCP, HA matrix cracks because of the phase change of tetragonal-zirconia into monoclinic-zirconia |
