Dynamic fatigue behavior of dental porcelain modified by surface deposition of a YSZ thin film.
Dynamic fatigue behavior of dental porcelain modified by surface deposition of a YSZ thin film.
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YSZ 薄膜表面沉积改性牙瓷的动态疲劳行为。
DOI：
10.1111/j.1532-849x.2008.00340.x
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Thompson,JeffreyY
中科院分区：
文献类型：
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作者：
Teixeira,EricaC;Piascik,JeffreyR;Stoner,BrianR;Thompson,JeffreyY
目的：本研究的目的是评估通过沉积氧化钇稳定氧化锆 (YSZ) 薄膜进行改性的牙瓷的基本疲劳参数，并将数据与未改性对照的数据进行比较。方法：从 ProCAD 块上切割出 200 根棒材 (2 × 2 × 15 mm3)。使用 1200 粒度的 SiC 磨料对样品进行湿式抛光。每个棒的一个表面都用 50 μm Al2O3 磨料 (50 psi) 喷砂。一半的样品通过在喷砂表面沉积 3 μm YSZ 薄膜进行了进一步修饰。使用射频磁控溅射系统（工作压力为 15 mT、150°C、Ar:O2 气体比例为 30:1）进行沉积。样品在去离子水 (37°C) 中以不同的应力速率进行测试：5.0、0.1 和 0.01 MPa/s（n = 25/组），并在空气中（25°C，70 MPa/s）测定惰性强度。所有强度测量均通过伺服电动测试系统中的三点弯曲（跨度= 10毫米）进行。结果：未涂层喷砂组的平均弯曲强度值（MPa）和标准偏差为：98.6（5.5）、90.7（5.9）和84.2（8.5），喷砂+YSZ薄膜组：125（9.4）， 119.3 (7.8) 和 102.8 (7.0)，分别表示最高到最低的应力率。通过动态疲劳数据的线性回归计算疲劳参数n和lnB。对于未涂层组，n = 38，lnB = 4.7 MPa2/s，对于涂层组，n = 33，lnB = 10.8 MPa2/s。威布尔分析还表明，未涂层和涂层组的特征参数 (σo) 分别为 113.3 和 125.7 MPa。结论：通过应用 YSZ 薄膜改性的样品强度有所增加。据推测，薄膜应用可以改变缺陷或残余表面应力状态。
Purpose:The objective of this study was to evaluate the basic fatigue parameters of a dental porcelain modified by deposition of a yttria‐stabilized zirconia (YSZ) thin film and to compare the data to that of an unmodified control.Methods:Two hundred bars (2 × 2 × 15 mm3) were cut from ProCAD blocks. Specimens were wet‐polished with 1200‐grit SiC abrasive. One surface of each bar was sandblasted with 50 μm Al2O3abrasive (50 psi). Half the specimens were further modified through deposition of a 3‐μm YSZ thin film on the sandblasted surface. Depositions were performed using an radio frequency magnetron sputter system (working pressure of 15 mT, 150°C, 30:1 Ar:O2gas ratio). Specimens were tested at different stressing rates: 5.0, 0.1, and 0.01 MPa/s (n = 25/group) in deionized water (37°C), and inert strength was determined in air (25°C, 70 MPa/s). All strength measurements were carried out by three‐point bending (span = 10 mm) in a servo‐electric test system.Results:The mean flexural strength values (MPa) and standard deviation for the uncoated sandblasted group were: 98.6 (5.5), 90.7 (5.9), and 84.2 (8.5), and for the sandblasted + YSZ thin film group: 125 (9.4), 119.3 (7.8), and 102.8 (7.0), for the highest to the lowest stressing rates, respectively. The fatigue parameters n and lnB were calculated by linear regression of dynamic fatigue data. For the uncoated group, n = 38 and lnB = 4.7 MPa2/s, and for the coated group, n = 33 and lnB = 10.8 MPa2/s. Weibull analysis was also performed showing that the characteristic parameter (σo) was 113.3 and 125.7 MPa for the uncoated and coated group, respectively.Conclusions:There was an increase in strength for specimens modified by application of a YSZ thin film. It is hypothesized that thin‐film application modifies flaws or residual surface stress states.