Mechanical properties, corrosion behavior and in-vitro bioactivity of nanostructured Pd/PdO coating on Ti–6Al–7Nb implant

The aim of this study was to investigate the possibility of modifying model BisGMA/TEGDMA dental composite by substituting 10 wt. % of conventional glass fillers with bioactive fillers based on calcinated nanosized hydroxyapatite (HAp) and Mg doped hydroxyapatite (Mg-HAp). HAp and Mg-HAp powders were synthesized hydrothermally. Mechanical properties: hardness by Vickers (HV) and flexural strength (Fs) were tested initially and after being stored for 28 days in simulated body fluid (SBF). The experimental composites with HAp and Mg-HAp particles showed no statistically significant difference in HV compared to the control (p>0.05) either initially or after storage. Although mean Fs values of modified composites tested initially were lower (62 MPa) than those of the control (72 MPa), after 28 days of storage in SBF Fs values were greater for modified composites (42 MPa control sample, 48 MPa HAp and Mg-HAp samples). In vitro bioactivity of BisGMA/TEGDMA composites with HAp and Mg-HAp particles after 28 days in SBF was not detected. Keywords: hydroxyapatite; magnesium; dental composite; mechanical properties;

Download Full-text

In vitro bioactivity, physical and mechanical properties of carbonated-fluoroapatite during mechanochemical synthesis

Ceramics International ◽

10.1016/j.ceramint.2018.08.184 ◽

2018 ◽

Vol 44 (17) ◽

pp. 21323-21329 ◽

Cited By ~ 14

Author(s):

Rasha A. Youness ◽

Mohammed A. Taha ◽

Medhat Ibrahim

Keyword(s):

Mechanical Properties ◽

Mechanochemical Synthesis ◽

Physical And Mechanical Properties ◽

In Vitro Bioactivity

Download Full-text

Effects of hydroxyapatite content on mechanical properties and in-vitro corrosion behavior of ZK60/HA composites

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.1515/ijmr-2020-1110802 ◽

2020 ◽

Vol 111 (8) ◽

pp. 621-631

Author(s):

Jie Teng ◽

Zili Xu ◽

Jinlong Su ◽

Yuan Li

Keyword(s):

Mechanical Properties ◽

Corrosion Resistance ◽

Corrosion Behavior ◽

Electrochemical Measurement ◽

X Ray Diffraction ◽

Corrosion Morphology ◽

Hardness Tests ◽

Zk60 Alloy ◽

Immersion Testing

Abstract In this study, hydroxyapatite-reinforced ZK60 Mg alloybased composites were fabricated via a powder metallurgy route. The mechanical properties of these composites were studied by compressive tests and hardness tests. The in-vitro corrosion behavior was also investigated using immersion testing and electrochemical measurement. The influence of hydroxyapatite content on the mechanical properties and invitro corrosion behavior was evaluated. The microstructure and corrosion morphology were characterized by means of X-ray diffraction, optical and scanning electron microscopy. The results showed that the composite materials with 10 wt.% hydroxyapatite exhibited a better combination of mechanical strength and corrosion resistance. Compared with ZK60 alloy, the addition of 10 wt.% hydroxyapatite resulted in an increase in corrosion resistance by 38.6%.

Download Full-text