Effect of sandblasting on the long-term performance of dental ceramics
Effect of sandblasting on the long-term performance of dental ceramics
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DOI：
10.1002/jbm.b.30097
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发表时间：
2004-11-15
影响因子：
3.4
通讯作者：
Thompson, VP
中科院分区：
文献类型：
--
作者：
Zhang, Y;Lawn, BR;Thompson, VP
本文研究了喷砂处理对Y-TZP和氧化铝陶瓷层与聚合物基体结合并在顶面用球形压头加载的强度的影响，以模拟牙本质上的陶瓷冠的咬合接触。喷砂处理是在粘结到基底之前应用于陶瓷底表面，如在普通牙科实践中那样。具有抛光表面的样本用作对照。在球形压头上施加单调递增（动态）和正弦（循环）载荷进行试验，直至接触点下方陶瓷底面处的径向断裂开始点。对于抛光试样，动态和循环试验的数据重叠，与占主导地位的缓慢裂纹扩展模式的疲劳。喷砂试样的强度在动态和循环测试中均显示出显著降低，表明起始Haws较大。然而，在循环数据中，这种变化要大得多，这表明喷砂缺陷的某些机械辅助生长。这些结果在牙冠寿命的上下文中具有影响。(C)2004 Wiley Periodicals，Inc.
A study has been made of the effects of sandblasting on the strength of Y-TZP and alumina ceramic layers joined to polymeric substrates and loaded at the top surfaces by a spherical indenter, in simulation of occlusal contact in ceramic crowns on tooth dentin. The sandblast treatment is applied to the ceramic bottom surface before bonding to the substrate, as in common dental practice. Specimens with polished surfaces are used as a control. Tests are conducted with monotonically increasing (dynamic) and sinusoidal (cyclic) loading on the spherical indenter, up to the point of initiation of a radial fracture at the ceramic bottom surface immediately below the contact. For the polished specimens, data from the dynamic and cyclic tests overlap, consistent with a dominant slow crack growth mode of fatigue. Strengths of sandblasted specimens show significant reductions in both dynamic and cyclic tests, indicative of larger starting Haws. However, the shift is considerably greater in the cyclic data, suggesting some mechanically assisted growth of the sandblast flaws. These results have implications in the context of lifetimes of dental crowns. (C) 2004 Wiley Periodicals, Inc.