치아회분과 석고혼합제재의 물성에 관한 연구 = A Study on the Physical Properties of Tooth Ash-Plaster Mixture

다국어 초록 (Multilingual Abstract)

The purpose of this study is to evaluate the use value of tooth ash-plaster mixture as an alternative material of the synthetic hydroxyapatite. For this purpose the author performed the experimental study to investigate the physical properties of sintered tooth ash-plaster mixture.
The tooth ash was made by increasing procedure at 850℃, 900℃ and 950℃ for 20min, 40min and 60min respectively. The composition of tooth ash was analyzed using ICPSE and X-ray diffraction was done.
The experimental specimens were molded to the cylindrical from 10mm high, 5mm
diameter under the pressure of 1,000kg/㎠ for test of compressive strength values and 3mm high, 6mm diameter for test of diametral tensile strength values and surface microhardness values. Mixtures of tooth ash-plaster mixture was vacuum fired at 1,000℃ for 60min. The physical properties of the sintered specimen were examined and their microstructures were observed under the scanning electron microscope.

The results were as follows:

1. x-ray diffraction showed the crystallization of tooth ash was developed as the incinerating temperature and time were increased, but the phase transformation following the incinerating temperature and time was not occurred.
2. The values of compressive strength of the sintered tooth ash-plaster mixture were the highest in case of incinerating temperature 950℃, the incinerating time 60min, and the tooth ash-plaster mixing weight ratio of 4:1. The higher tge incineration temperature and the longer the incineration time was, the more increased the compressive strengths were(p<0.01).
3. The values of diametral tensile strength of the sintered tooth ash-plaster mixture were the highest in case of the incinerating temperature 950℃, the incinerating time 60min, and the tooth ash-plaster mixing weight ratio of 4:1. The higher incineration temperature and the longer the incineration time was, the more increased the diametral tensile strengths were (p<0.01). The more decreased tooth ash-plaster mixing ratio was, the more increased the diametral tensile strength was, but there was not a significant difference statistically (p<0.01).
4. The values of surface microhardness of the sintered tooth ash-plaster mixture were also the highest in case of the incinerating temperature 950℃, the incinerating time 60min, and the tooth ash-plaster mixing weight ratio of 4:1. The higher the incineration temperature was, the more increased the surface microhardness values were, but there was not a significant difference statistically(p<0.01). The longer the incineration time was and the more decreased the tooth ash-plaster mixing ratio was, the more increased the surface microhardness values were.
5. The porosity and absorption of the sintered tooth ash-plaster mixture were the highest in case of the incinerating temperature 850℃, the incinerating time 20min, and the tooth ash-plaster mixing weight ratio of 3:1. The lower the incineration temperature was and the shorter the incineration time was, the more increased the porosity was.
6. There was a good wettability in the sintered tooth ash-plaster mixture under the scanning electron microscope.