Abstract
This study is focused on the role of nano hydroxyapatite particles on the mechanical properties of PMMA/HA nanocomposites. In order to achieve a proper and homogeneous distribution of HA particles in the polymer matrix, mixer milling process was applied. Wear, compression and three-point bending tests were conducted. It was observed that wear rate decreased by increasing in HA content in both atmosphere and artificial saliva. The results of compression tests showed that the addition of 2.5 percent HA to PMMA promoted ultimate compressive strength, yield strength and modulus while caused to decrease elongation at break. Also it was elucidated that addition of HA more than 2.5 wt.% caused a decrease in both ultimate compressive strength and compression yield strength and an increase in elongation at break. The results of three-point bending tests on the PMMA cements containing 2.5 percent HA demonstrated the maximum bending strength value and modulus among all the HA containing formulations. However there was no direct proportionality between the results of bending tests and the HA content and the addition of HA to PMMA (up to 10 wt.%) did not change the bending properties significantly.
Highlights
Polymethylmethacrylate (PMMA) is widely used as bone cement to secure orthopedic implants to the skeleton [1]
This study is focused on the role of nano hydroxyapatite particles on the mechanical properties of PMMA/ HA nanocomposites
The results of compression tests showed that the addition of 2.5 percent HA to PMMA promoted ultimate compressive strength, yield strength and modulus while caused to decrease elongation at break
Summary
Polymethylmethacrylate (PMMA) is widely used as bone cement to secure orthopedic implants to the skeleton [1]. Because of its limited mechanical properties and poor compatibility with bone, the clinical use of this cement is accompanied by complications. Several investigators have studied HA-reinforced PMMA (PM-MA/HA) as a potential bone cement [10,14,15,16]. Vallo et al [23] indicated that addition of up to 15 wt% HA to a commercially available PMMA-based bone cement can improve the flexural modulus but with this amount of HA, the tensile and compressive strengths have been observed to remain constant in PMMA base cement. Moursi et al [25] have used three point bending test to investigate the effect of addition of HA on mechanical properties of PMMA cement. Mechanical properties of nano HA-reinforced PMMA cement were investigated by using three point bending, compressive and wear test
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