MECHANICAL PROPERTIES OF BONE REPAIRING LIKE COMPOSITIONS BASED ON CALCIUM ALUMINATE CEMENT

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(Institution)
Abstract
02-009 Gabriela do Vale Vieira Vieira, G.d.(Universidade do Vale do Paraíba); Santos, P.C.(Universidade do Vale do Paraíba); Pandolfelli, V.C.(Universidade Federal de São Carlos); Oliveira, I.R.(Universidade do Vale do Paraíba); Calcium aluminate cement (CAC) based materials show great potential in the biomaterial area due to their unique curing/hardening features and related microstructure. Some studies have also reported CAC applications for repairing bone defects, based on the fact that its chemical composition and thermal expansion coefficient are similar to teeth and human bones. However, cements used in orthopedics must fulfill other requirements, such as low curing temperature (to prevent thermal necrosis of the bone tissue during setting), suitable setting time and high crushing strength (in order to withstand the compressive load developed during daily activities). In this work, some mechanical properties of CAC-based compositions containing 4 wt% of additives (alumina, zirconia, zinc oxide, hydroxyapatite or tricalcium phosphate) or 1 wt% of (chitosan or collagen) were evaluated. The hardness was measured using Vickers durometer for samples cured at 37oC for 24 h and dried at 110oC. The flexural modulus of rupture was measured by three point bending test for samples treated in solution body fluid (SBF) at 37oC for 7 days. The Young's modulus of samples before and after treatment in SBF at 37ºC for 7 days was measured using impulse excitation of vibration technique. The addition of phosphate, chitosan and collagen reduced the hardness when compared to plain CAC. The addition of chitosan and mainly collagen induced a decrease in the flexural strength. The compositions evaluated showed a significant increase of the Young's modulus after treatment in SBF due to the precipitation of apatite phases on the surface of the material improving its mechanical resistance.
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