| 치과 임플란트 상부구조물용 (Y, Nb)-TZP/알루미나 복합체의 기계적 물성 |
| 정형호, 김대준1, 한중석2, 이득용3 |
세종대학교 신소재공학과
1세종대학교 신소재공학
2서울대학교 치과대학 보철
3대림대학교 재료정보학과 |
| Mechanical Properties of (Y, Nb)-TZP/Alumina Composites for Dental Implant Abutments |
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| ABSTRACT |
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For abutment of dental implants, (Y, Nb)-TZP/Alumina composites were prepared by addition of 10-90 vol% alumina at an interval of 10 vol％ into tetragonal zirconia solid solution which consists of 90.24 mol% Zr $O_2$, 5.31 mol% Y$_2$ $O_3$, and 4.45 mol% Nb$_2$O$_$5/. Biaxial flexure strength and fracture toughness of composite were optimized by adding 10 vol% alumina, which resulted in 900 MPa and 8.9 MPam$^$1/2/, respectively. The composite did not undergo low temperature degradation even after autoclave treatment at 200$^{circ}C$ for 10 h. 65 of (Y, Nb)-TZP/Alumina composite abutments were employed into 40 patients and any adverse reaction, screw loosing, or fracture of abutments was not observed for the span of 2 years, indicating that the ceramic abutments can be safely used for restorations. |
| Key words:
Zirconia/Alumina composite, Biaxial flexure strength, Fracture toughness, Ceramic abutment |
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