[表面处理对氧化钇和氧化镁稳定氧化锆种植体的相和断裂强度的影响]
[Effects of surface treatment on the phase and fracture strength of yttria- and magnesia-stabilized zirconia implants].
作者信息
Ding Q, Li W J, Sun F B, Gu J H, Lin Y H, Zhang L
机构信息
Department of Proshodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
出版信息
Beijing Da Xue Xue Bao Yi Xue Ban. 2023 Aug 18;55(4):721-728. doi: 10.19723/j.issn.1671-167X.2023.04.025.
OBJECTIVE
To evaluate the effects of surface treatment on the phase and fracture strength of yttria-and magnesia-stabilized and its mechanisms.
METHODS
One-piece cylindrical screw-type implants were fabricated with yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and magnesia partially stabilized zirconia (Mg-PSZ) using computer aided design (CAD)/computer aided manufacture (CAM) technique.They were divided into three groups: (1) placed in water for 1 h after final sintering (control group), (2) sandblasting using 110 μm AlO particles, (3) sandblasting plus etching with hydrofluoric acid for 1 h.The surface morphology and roughness of the implants were evaluated.Tetragonal to monoclinic transformation was measured on the surface by X-ray diffraction.Static tests of the zirconia implants were carried out at room temperature following the International Standards Organization (ISO)14801:2014 Standard.
RESULTS
Both sandblasting alone and sandblasting plus acid etching significantly increased surface roughness (Ra) of Mg-PSZ and Y-TZP implants ( < 0.01), with sandblasting plus acid etching exhibited the highest surface roughness.No monoclinic band was detected in Mg-PSZ surface.Compared with the control group, the surface monoclinic content of Mg-PSZ had no obvious change after surface treatments.However, strong monoclinic bands appeared in surface modified Y-TZP.Monoclinic content of Y-TZP was higher than that of control group (1.55%) after both sandblasting alone (16.44%) and sandblasting plus acid etching (7.68%).For Mg-PSZ implants, fracture strengths of sandblasting group and sandblasting plus acid etching group were (294.1±3.3) N and (331.3±26.4) N respectively, which were lower than that of control group (458.4±48.7) N with significant differences ( < 0.01).For Y-TZP implants, fracture strength of control group was (827.3±101.6) N.Compared with control group, sandblasting group showed significantly higher fracture strength (=0.03), which was (1 162.9±116.5) N.While sandblasting plus acid etching group had a fracture strength of (867.2±171.0) N, with no significant difference with control group (>0.99).
CONCLUSION
Sandblasting improved the fracture strength of Y-TZP implants.For the Mg-PSZ implants manufactured in this study, surface treatments with sandblasting and sandblasting plus acid etching resulted in a decrease of fracture strength.
目的
评估表面处理对钇和镁稳定氧化锆的相及断裂强度的影响及其机制。
方法
采用计算机辅助设计（CAD）/计算机辅助制造（CAM）技术，用钇稳定四方多晶氧化锆（Y-TZP）和镁部分稳定氧化锆（Mg-PSZ）制作一体式圆柱形螺旋型种植体。将其分为三组：（1）最终烧结后在水中放置1小时（对照组）；（2）用110μm氧化铝颗粒喷砂；（3）喷砂并氢氟酸蚀刻1小时。评估种植体的表面形态和粗糙度。通过X射线衍射测量表面四方相向单斜相的转变。按照国际标准化组织（ISO）14801:2014标准在室温下对氧化锆种植体进行静态测试。
结果
单独喷砂和喷砂加酸蚀刻均显著增加了Mg-PSZ和Y-TZP种植体的表面粗糙度（Ra）（P<0.01），喷砂加酸蚀刻的表面粗糙度最高。Mg-PSZ表面未检测到单斜带。与对照组相比，Mg-PSZ表面处理后表面单斜相含量无明显变化。然而，表面改性的Y-TZP出现了强烈的单斜带。单独喷砂（16.44%）和喷砂加酸蚀刻（7.68%）后，Y-TZP的单斜相含量均高于对照组（1.55%）。对于Mg-PSZ种植体，喷砂组和喷砂加酸蚀刻组的断裂强度分别为（294.1±3.3）N和（331.3±26.4）N，均低于对照组（458.4±48.7）N，差异有统计学意义（P<0.01）。对于Y-TZP种植体，对照组的断裂强度为（827.3±101.6）N。与对照组相比，喷砂组的断裂强度显著更高（P=0.03），为（1162.9±116.5）N。而喷砂加酸蚀刻组的断裂强度为（867.2±171.0）N，与对照组无显著差异（P>0.99）。
结论
喷砂提高了Y-TZP种植体的断裂强度。对于本研究制作的Mg-PSZ种植体，喷砂和喷砂加酸蚀刻的表面处理导致断裂强度降低。
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