치아회분과 석고혼합제재의 물성에 관한 연구
A Study on the Physical Properties of Tooth Ash-Plaster Mixture
소속 상세정보
고영무/Yeong-Mu Ko
계기성/김광수/강동완/김윤주/Kee-Sung Kay/Kwang-Su Kim/Dong-Wan Kang/Yoon-Ju Kim
KMID : 0362219980250010085
Abstract
결론
발거된 치아 중 우식정도가 1도(Cl) 이하인 치아를 수집하여 850℃, 900℃, 및 950℃ 등
각각 다른 온도에서 각각 20분,40분,60분 동안 탈회화(calcination)하여 200mesh(75μm) 이
하의 치아회분을 제작하였다. 각각 9종의 치아회분말을 석고와 무게비 2:1, 3:1 및 4:1로 혼
합하여 압축강도, 간접인장강도, 표면미세경도, 기공율 및 흡수율을 측정하고 주사전자현미
경으로 관찰하여 다음과 같은 결과를 얻었다.
1. 치아회분말의 x-선 회절분석 결과 회화온도와 회화 시간이 증가함에 따라 치아회분말
의 결정성은 증가하였으나 회화온도와 회화시간에 따른 상변화는 없었다.
2. 치아회분말-석고 혼합 소결체의 압축강도는 회화온도 950℃, 회화시간 60분, 치아회분
말-석고 혼합비 4:1인 경우에서 가장 높았으며 회화온도와 회화 시간이 증가함에 따라 증가
하였다(p<0.01).
3. 치아회분말-석고 혼합 소결체의 간접인장강도는 회화온도 950℃, 회화시간 60분, 치아
회분말-석고 혼합비 4:1인 경우에서 가장 높았으며 회화온도와 회화시간이 증가함에 따라
증가하였다(p<0.01). 그리고 치아회분말과 석고혼합비가 감소할수록 간접 인장강도는 증가
하였으나 유의성 있는 차이를 보이지 않았다(p>0.01).
4. 치아회분말-석고 혼합 소결체의 표면미세경도는 회화온도 950℃, 회화시간 60분, 시아
회분말-석고 혼합비 4:1인 경우에서 가장 높았으며 회화온도가 높을수록 표면경도값은 증가
하였으나 유의성있는 차이를 보이지 않았다(p>0.01). 회화시간이 길수록 표면경도값은 유의
성있게 증가하였으며 치아회분말과 석고혼합비가 감소할수록 표면미세경도는 증가하였다.
5. 치아회분말-석고 혼합 소결체의 기공율 및 흡수율은 회화온도가 850℃, 회화시간 20분,
치아회분말-석고 혼합비 3:1인 경우에서 가장 높았으며, 회화온도가 낮을수록, 회화시간이
짧을수록 기공율이 증가하였다.
6. 치아회분말과 석고의 혼합 소결체를 주사전자현미경으로 관찰한 결과, 치아회분말과 석
고의 젖음성이 우수하였다.
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 incinerating procedure at 850℃, 900℃ and 950℃ for
20min, 40min and 60min respectively. The composition of tooth ash was analyzed using
ICPES and x-ray diffraction was done.
The experimental specimens were molded to the cylindrical form 10㎜ high, 5㎜
diameter under the pressure of 1,000㎏/CM2 for test of compressive
strength values and 3㎜ high 6㎜ diameter for test of diametral tensile strength values
and surface microhardness values. Mixtures of tooth ash-plaster were divided into 3
group according to the mixing weight ratio of 2:1, 3:1 and 4:1. Each sintered 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.
tooth ash-plaster mixture; compressive strength; diametral tensile strength; surface microhardness values; porosity; absorption;
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