Mechanical Properties of Dense Artificial Bone Fabricated by Powder Processing

Year 2019, Volume: 3 Issue: 1, 22 - 24, 04.03.2019

Onur Yontar , Mevlüt Gürbüz

Abstract

Osseointegration and osteoconduction are
essentials for artificial bone tissue production. Hydroxyapatite has been
extensively used in orthopedic application due to its similar composition with
bone. It is a highly biocompatible calcium-phosphate based bioceramic which
could be shaped into bone like structure with powder processing techniques.
Gradually changing porosity pattern of bone maintains both ease of transmission
of bodily fluids and structural strength. Due to fracture type, in some
instances bone tissue could not be recoverable and aligning large bone fractals
requires dense bone tissue to place fixation apparatus. In this study, the aim
is to produce a dense hydroxyapatite artificial bone and the effects of
sintering duration and temperature were investigated.  Metal ion doped calcium phosphates in
hydroxyapatite form (<100nm) were used as powder. Two different types of
Polyvinyl alcohol (PVA, with molecular weights of 10000 and 60000g/mol) were
used as plasticizers to obtain strong green samples. The samples were sintered
between 1000°C to 1200^°C for 60-300 min. Hardness and compression
test were performed to observe effect of the process parameters. From the SEM
images and density measurements, highly dense samples were fabricated at 1200^°C
for 120 minutes.  Compressive strength and
hardness were enhanced up to 71 MPa and 4.5 GPa, respectively.

Keywords

Hydroxyapatite, Artificial bone, Bioceramic, Powder processing, Biomechanic

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