三种牙科氧化钇稳定氧化锆陶瓷芯材料的抗低温老化性能。

Institute of Stomatology, People's Liberation Army General Hospital, Beijing 100853, China.

Chin Med J (Engl). 2012 Jun;125(11):1999-2003.

BACKGROUND

The low-temperature resistance aging performance of Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) is the key effective factor that influences the long-term success rate of prosthesis. The objective of this study was to test and compare the aging performances for resisting low temperature of Lava Frame, Cercon Smart, and Upcera Yttria-stabilized zirconia core materials, via analyzing the micro and the crystal phases of the materials, and measure the three-point bending strength and the fracture toughness.

METHODS

The three zirconia green bodies were prepared as 60 test samples for three-point bending strength and as 60 test samples for fracture toughness. The test samples for three-point bending strength and fracture toughness were assigned to five groups and were treated respectively for 0, 5, 10, 15, and 20 hours to observe the micro and the crystal phases of the test samples. Then the three-point bending strength and fracture toughness were tested by X-ray diffraction (XRD).

RESULTS

The m phase content of Lava Frame was raised from 7.70% to 13.01%; the m phase content of Cercon Smart was raised from 4.95% to 8.53%; and Lava Frame is raised from 10.84% to 35.18%. The three-point bending strengths of the three zirconia core materials were higher than 1100 MPa and the fracture toughness was higher than 3 MPa·m(1/2). The three-point bending strength and the fracture toughness of Upcra zirconia decreased the most, followed by Lava Frame, and then by Cercon Smart.

CONCLUSION

The aging resistance sequences of the three zirconia core materials are, from strong to weak, Cercon Smart, Lava Frame, and Upcera.

背景

氧化钇稳定四方氧化锆多晶（Y-TZP）的低温抗老化性能是影响假体长期成功率的关键有效因素。本研究旨在通过分析材料的微观和晶体相，测量三点弯曲强度和断裂韧性，测试和比较 Lava Frame、Cercon Smart 和 Upcera 氧化锆芯材的低温抗老化性能。

方法

将三种氧化锆生坯分别制备 60 个三点弯曲强度测试样和 60 个断裂韧性测试样。三点弯曲强度和断裂韧性测试样分别分为五组，分别处理 0、5、10、15 和 20 小时，观察测试样的微观和晶体相。然后通过 X 射线衍射（XRD）测试三点弯曲强度和断裂韧性。

结果

Lava Frame 的 m 相含量从 7.70%增加到 13.01%；Cercon Smart 的 m 相含量从 4.95%增加到 8.53%；Lava Frame 的 m 相含量从 10.84%增加到 35.18%。三种氧化锆芯材料的三点弯曲强度均高于 1100 MPa，断裂韧性均高于 3 MPa·m(1/2)。三种氧化锆芯材料中，Upcera 氧化锆的三点弯曲强度和断裂韧性下降最大，其次是 Lava Frame，然后是 Cercon Smart。