Papers by Muhammad Wildan
IFMBE Proceedings, 2007
The production of hydroxyapatite (HA) from bovine bones was studied in this paper. Bovine hydroxy... more The production of hydroxyapatite (HA) from bovine bones was studied in this paper. Bovine hydroxyapatite (BHA) was produced from bovine bone powders by calcination without compaction. The powders were calcined at temperatures ranging from 700-1100ºC. It was discovered that sample preparation has some influence on the calcination behavior of the bovine bone powders. XRD results confirmed that HA has been successfully produced but traces of α-TCP and β-TCP were also found. The Ca/P ratios of the BHA powders produced from the process have values greater than 2.0.
Materials Science and Engineering: C, 2009
... TTCP) [22]. Kutty and Ramesh reported that decomposition of HA suppressed densification and w... more ... TTCP) [22]. Kutty and Ramesh reported that decomposition of HA suppressed densification and was accompanied by a decreased in mechanical properties [23]. Most of ... et al. [31] and also Muralithran and Ramesh [32]. They reported ...
Materials Science Forum, 2007
The production of natural hydroxyapatite (HAp) specifically from cortical bovine bones and natura... more The production of natural hydroxyapatite (HAp) specifically from cortical bovine bones and natural calcite was studied in this paper. Bovine hydroxyapatite (BHA) was produced from bovine bone in bulk form by de-fatting continued with calcination at 900ºC. Natural calcite hydroxyapatite (CHA) was produced by hydrothermal method. It was confirmed from XRD, FTIR, and SEM results that HA have been successfully produced from natural sources like bulk bovine bone and natural calcite. The results also show that the crystallinity of BHA is higher than CHA, matching with the hardness test results of sintered BHA and CHA.
Advanced Materials Research, 2013
This study prepared porous hydroxyapatite (porous HA) as synthetic scaffold and find out chemical... more This study prepared porous hydroxyapatite (porous HA) as synthetic scaffold and find out chemical properties, porosity, compressive strength and cytotoxicity properties. Porous HA was prepared by powder deposition and sintering from HA-PMMA mixed powder. Porous HA characterizations were conducted by XRD, XRF, SEM-EDX and mercury porosimetry analysis. In vitro cytotoxicity testing of porous HA was conducted by MTT method using vero cells. Porous HA has porosity on the interval 62.79 to 69.67% and compressive strength on the interval 1.53 to 3.71 MPa. Optimal porous HA has porosity is 62.79% with compressive strength is 3.71 MPa. Mercury porosimetry analysis showed that optimal porous HA has interconnective porosity up to 88.25% with pore size on the interval 0.05-355 µm and median pore is 52.64 µm. There was no significantly difference in the death percentage of vero cells caused HA powder and optimal porous HA (p= 0.158) but concentration of optimal porous HA were significantly effect on the percentage of vero cells death (p=0.003).
Materials Science Forum, 2007
The production of natural hydroxyapatite (HAp) specifically from cortical bovine bones and natura... more The production of natural hydroxyapatite (HAp) specifically from cortical bovine bones and natural calcite was studied in this paper. Bovine hydroxyapatite (BHA) was produced from bovine bone in bulk form by de-fatting continued with calcination at 900ºC. Natural calcite hydroxyapatite (CHA) was produced by hydrothermal method. It was confirmed from XRD, FTIR, and SEM results that HA have been successfully produced from natural sources like bulk bovine bone and natural calcite. The results also show that the crystallinity of BHA is higher than CHA, matching with the hardness test results of sintered BHA and CHA.
Advanced Materials Research, 2012
In the present study, hydroxyapatite was synthesized from local gypsum by microwavehydrothermal m... more 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 140 o C with holding time for 1 hour into the green parts. These green parts were sintered at temperature of 1450 o C 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 CaZrO 3 , β-TCP and α-TCP, HA matrix cracks because of the phase change of tetragonal-zirconia into monoclinic-zirconia.
Advanced Materials Research, 2012
In the present study, hydroxyapatite was synthesized from local gypsum by microwavehydrothermal m... more 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 140 o C with holding time for 1 hour into the green parts. These green parts were sintered at temperature of 1450 o C 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 CaZrO 3 , β-TCP and α-TCP, HA matrix cracks because of the phase change of tetragonal-zirconia into monoclinic-zirconia.
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Papers by Muhammad Wildan