Brittle and ductile adjustable cement derived from calcium phosphate cementpolyacrylic acid composit.pdf

dental mater ials 2 4 ( 2 0 0 8 ) 1616–1622 avai lab le at www.sc iencedi rec t .com journa l homepage: www. int l .e lsev ierhea l th .com/ journa ls /dema Brittle and ductile adjustable cement derived from calcium phosphate cement/polyacrylic acid composites Wen-Cheng Chena, Chien-Ping Jub, Jen-Chyan Wanga, Chun-Cheng Hunga, Jiin-Huey Chern Linb,? a Faculty of Dentistry, Kaohsiung Medical University, 807 Kaohsiung, Taiwan, ROC b Department of Materials Science and Engineering, National Cheng-Kung University, 70101 Tainan, Taiwan, ROC a r t i c l e i n f o Article history: Received 6 December 2007 Accepted 3 March 2008 Keywords: Calcium phosphate cement Brittle Ductile Modulus Polyacrylic acid Brushite a b s t r a c t Objectives. Bone filler has been used over the years in dental and biomedical applications. The present work is to characterize a non-dispersive, fast setting, modulus adjustable, high bioresorbable composite bone cement derived from calcium phosphate-based cement com- bined with polymer and binding agents. This cement, we hope, will not swell in simulated body fluid and keep the osteogenetic properties of the dry bone and avoid its disadvantages of being brittle. Methods. We developed a calcium phosphate cement (CPC) of tetracalcium phos- phate/dicalcium phosphate anhydrous (TTCP/DCPA)–polyacrylic acid with tartaric acid, calcium fluoride additives and phosphate hardening solution. Results. The results show that while composite, the hard–brittle properties of 25wt% poly- acrylic acid are proportional to CPC andmixingwith additives is the sameas those of theCPC without polyacrylic acid added. With an increase of polyacrylic acid/CPC ratio, the 67wt% samples revealed ductile–tough properties and 100wt% samples kept ductile or elastic prop- erties after 24h of immersion. The modulus range of this development was from 200 to 2600MPa after getting immersed in simulated body fluid for 24h. Significance. The TTCP/DCPA–polyacrylic acid based CPC demonstrates