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KMID : 0988720090250010073
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2009 Volume.25 No. 1 p.73 ~ p.82
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The Effect of Temperature and Concentration of Setting Solution on the Rheological Properties of Injectable Calcium Phosphate
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Yoo Heyon-Mee
Park Dong-Sung
Chang Seok-Woo
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Abstract
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Injectable calcium phosphate cement (CPC) has been used as bone substitute successfully due to good biocompatibility and osteoconductivity. One of the important mechanical characteristics of CPC is flowablility, which can be evaluated by measuring rheological parameters. However, there have been few studies that measured rheological properties of CPC. The purpose of this study was to evaluate the effects of temperature and concentrations of 2 kinds of setting solutions, hydroxyprophyl methylcellulose (HPMC) and polyacrylic acid (PAA), on rheological properties of CPC. The CPC used was dicalcium phosphate dihydrate (DCPD). Rheological properties of CPC paste were measured using rheometer. The effect of concentrations of each solution (2% and 1% HPMC and 35% and 17.5% PAA) was evaluated. The effect of temperature (25℃ and 37℃) on the rheological properties of CPC was also investigated. The statistical analysis was carried out with Mann-whitney test with Bonferronis collection. CPC with both setting solutions showed shear thinning behavior. Higher concentrations of setting solution (2% HPMC and 35% PAA) produced significantly higher viscosity than lower concentrations of setting solution (1% HPMC and 17.5% PAA). CPC with HPMC showed significantly higher viscosity at 37℃ that at 25℃. CPC with PAA showed lower viscosity at 37℃ than at 25℃, although the difference was not statistically significant. The results showed that CPC with HPMC or PAA solutions are pseudoplastic and the concentrations of setting solutions and temperature may have an effect on the rheological properties of CPC paste. These results showed that the flowability of injectable CPC could be improved by use of increasing frequency of oscillation. In clinical practice, the use of ultrasonic vibration would be helpful in application of injectable CPC. CPC with HPMC could be more easily applicated at 25℃ than 37℃. The use of lower concentrations of HPMC and PAA solution would be beneficial in terms of flowability.
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KEYWORD
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calcium phosphate cement, hydroxyprophyl methylcellulose, polyacrylic acid, rheological characteristics
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