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目的探索陶瓷自由成形制备全瓷牙种植体的工艺,并研究烧结温度对氧化锆陶瓷主要性能的影响。方法采用固相含量为55vol%的氧化锆陶瓷浆料,通过自由成形的方法制备试样,并用无压烧结方法在1 100℃、1 200℃、1 300℃和1 400℃下烧结试样,保温2 h,随炉冷却。对烧结试样的致密化程度、抗弯强度、微观形貌及相组成进行测试。结果试样最大收缩率为16.83%,致密度可达98.36%;1 300℃试样3点抗弯强度达到480 MPa;1 400℃试样X射线衍射检测出单斜相氧化锆的衍射峰,抗弯强度有所下降。结论陶瓷自由成形技术在牙科修复体制造领域具有广阔的发展前景,1 300℃烧结温度下试样综合性能最优,为最佳烧结温度。
Objective To explore the technology of ceramic free-form all-ceramic dental implants and to study the influence of sintering temperature on the main properties of zirconia ceramic. Methods The samples were prepared by freeform method using zirconia ceramic slurry with solid content of 55vol%. The samples were sintered by pressureless sintering at 1 100 ℃, 1 200 ℃, 1 300 ℃ and 1 400 ℃, Insulation 2 h, with the furnace cooling. The degree of densification, flexural strength, microstructure and phase composition of the sintered samples were tested. Results The maximum shrinkage of sample was 16.83% and the density was 98.36%. The bending strength at 1 point of 300 ℃ sample was 480 MPa. The diffraction peak of monoclinic zirconia was detected by X-ray diffraction at 1 400 ℃. Flexural strength decreased. Conclusion Ceramic freeform technology has broad prospects in the field of dental restorations. The optimum sintering temperature is the best overall performance at 1 300 ℃ sintering temperature.