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Detailed Program
Paper Number : BI-O07
Time Frame : 15:37~15:49
Presentation Date : Thurse day, 27, November
Session Name : Biomaterials
Session Chair 1# : H. S. Yoon
Session Chair 2# : K. Uetsuki
Synthesis of Bioglass Ceramic Using Commercial Water Glasses for Plasma Spray Coating on Dental Implants
Jaehui JEON
Yeungnam University
Among various bioceramic materials, bioinert hydroxyapatite (HA) was used to coat as a coating material on Ti by a plasma spraying method to provide favorable sites to bone cells/tissue. Nevertheless, the clinical application showed the undesirable results such as the delamination of HA coated layer from the surface of Ti dental implants. However, the HA coating on dental implants is considered a priority considering method because of direct bonding with natural bone. In other manner bioactive glass which was invented by L.L. Hench, bioglass (45S5) has been recently applied for bioactive coating on Ti implants to utilize the excellent bioactivity and biodegradation property. But the bioglass itself has a couple of problems such as a complicate process for bioglass preparation and fast degradation compared to the osseointegration rate.
In this study, the new synthetic method of bioglass ceramics was developed using a commercial water-glass by adding bioglass elements. As a result, the bioglass ceramic materials can be manufactured by relatively simple and inexpensive process. First, the mixed solution of phosphoric acid and distilled water was prepared. Water glass was added into the solution using a high-speed stirrer. Calcium nitrate tetrahydrate and 5N sodium hydroxide solution were added little by little over 1 hour into the solution to adjust the bioglass composition. This entire mixing process with magnetic stirrer was conducted at 80¡É. And then, the solution was dried for a single day in a drying oven. The dried powdery sample was heat treated at 1200¡É for 2 hours. A mass of glass-ceramic was crushed with a roller crusher to obtain appropriate size of granules. The glass ceramic granules were milled with 6mm zirconia ball in a HDPE jar for 24 hours to obtain round shape granules by grinding. Prior to the plasma spray coating, the washing and sieving of the ground granules were conducted in an alcohol bath to improve the flowability of powder during a plasma spray coating. The obtained granule size was 30~50 ¥ìm with a narrow size distribution.

References
[1] Larry L. Hench, The story of Bioglass, J Mater Sci: Mater Med (2006) 17:967–978
[2] J.M. Gomez-Vega, E. Saiz, A.P. Tomsia, G.W. Marshall, S.J. Marshall, Bioactive glass coatings with hydroxyapatite and Bioglass particles on Ti-based implants. 1. Processing, Biomaterials 21 (2000) 105-111
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