Division of Oral Implants Research, Oral Health Science Center, Tokyo Dental College, Mihama-ku, Chiba, Japan.
J Dent Res. 2012 Aug;91(8):800-4. doi: 10.1177/0022034512452277. Epub 2012 Jun 26.
Ce-TZP/Al(2)O(3) nanocomposite (NANOZR) has not only higher strength, but also higher fracture toughness than conventional Y-TZP, indicating its potential for use in dental implants. Surface treatment to obtain osseointegration, however, may alter its surface topography, thus affecting the cyclic fatigue strength that plays such an important role in the durability of this material. The aim of this study was to evaluate the influence of surface treatment on cyclic fatigue strength in NANOZR as compared with grit-blasted and acid-etched Y-TZP (125BE Y-TZP). Bi-axial flexure strength was measured in both static and cyclic fatigue tests, as recommended by ISO 6872. The cyclic fatigue test was performed by the staircase method in distilled water at 37°C, with a load of 10(6) cycles and 10 Hz. Bi-axial flexure strength of NANOZR was 1111-1237 MPa and 667-881 MPa in the static and cyclic fatigue tests, respectively. The bi-axial flexure strength of NANOZR under all conditions was greater than that of 125BE Y-TZP in the static and cyclic fatigue tests. The cyclic fatigue strength of NANOZR was more than twice that of Y-TZP as specified in ISO 13356 for surgical implants (320 MPa), indicating the promise of this material for use in dental implants.
Ce-TZP/Al(2)O(3)纳米复合材料（NANOZR）不仅具有更高的强度，而且比传统的 Y-TZP 具有更高的断裂韧性，这表明它有可能用于牙科植入物。然而，为了获得骨整合而进行的表面处理可能会改变其表面形貌，从而影响循环疲劳强度，这种强度在材料的耐久性中起着非常重要的作用。本研究的目的是评估表面处理对 NANOZR 循环疲劳强度的影响，并与喷砂酸蚀 Y-TZP（125BE Y-TZP）进行比较。根据 ISO 6872 的建议，在静态和循环疲劳试验中测量双轴弯曲强度。在 37°C 的蒸馏水中，以 10(6) 个循环和 10 Hz 的负载进行循环疲劳试验。NANOZR 的双轴弯曲强度在静态和循环疲劳试验中分别为 1111-1237 MPa 和 667-881 MPa。在所有条件下，NANOZR 的双轴弯曲强度均大于 125BE Y-TZP 在静态和循环疲劳试验中的强度。NANOZR 的循环疲劳强度是 ISO 13356 规定的用于手术植入物的 Y-TZP 的两倍以上（320 MPa），表明该材料有望用于牙科植入物。
