Teixeira E C, Piascik J R, Stoner B R, Thompson J Y
Department of General Dentistry, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, Texas 78229, USA.
Proc Inst Mech Eng H. 2009 Oct;223(7):897-902. doi: 10.1243/09544119JEIM543.
Recent research has shown that the application of specific thin films can enhance the material properties of a laminate construct. In this study, the effect of different mono/multilayered films on the strength of a ceramic specimen is demonstrated. It is well established that cracks can initiate and/or propagate from the internal surfaces of all-ceramic dental restorations. Modifying that surface by thin-film deposition might help increase clinical longevity and applicability. Specimens were divided into the following groups according to different surface treatments received: uncoated (control group), 10 microm yttria-stabilized zirconia (YSZ) thin film, 10 microm parylene thin film, 9.75 microm YSZ + 0.25 microm parylene film, and a multilayered film (five layers of 1.25 microm YSZ + 0.75 microm parylene). Depositions were performed using a radio-frequency magnetron sputter system (working pressure 15 mT, 150 degrees C, 30:1 Ar/O2 gas ratio) to produce the YSZ layers, and a vapour deposition process was used to produce the parylene layers. Flexural strength measurements were carried out by three-point bending (span = 10 mm) in a servo-electric material testing system in deioinized (DI) water (37 degrees C). The results showed that the strength of the specimen significantly increased with the deposition of all types of coating, showing the greatest increase with the multilayered film (approximately 32 per cent). It is hypothesized that a multilayer thin film (brittle/ductile) can promote crack deflection, causing strength enhancement of the brittle construct.
最近的研究表明，特定薄膜的应用可以增强层压结构的材料性能。在本研究中，展示了不同单层/多层薄膜对陶瓷试样强度的影响。众所周知，全瓷牙修复体的内表面会引发和/或传播裂纹。通过薄膜沉积对该表面进行改性可能有助于提高临床使用寿命和适用性。根据接受的不同表面处理，将试样分为以下几组：未涂层（对照组）、10微米氧化钇稳定氧化锆（YSZ）薄膜、10微米聚对二甲苯薄膜、9.75微米YSZ + 0.25微米聚对二甲苯薄膜以及多层薄膜（五层1.25微米YSZ + 0.75微米聚对二甲苯）。使用射频磁控溅射系统（工作压力15毫托、150摄氏度、氩气/氧气气体比例30:1）进行沉积以制备YSZ层，并使用气相沉积工艺制备聚对二甲苯层。在伺服电动材料测试系统中，于去离子（DI）水（37摄氏度）中通过三点弯曲（跨度 = 10毫米）进行抗弯强度测量。结果表明，随着所有类型涂层的沉积，试样的强度显著增加，多层薄膜的强度增加最大（约32%）。据推测，多层薄膜（脆性/韧性）可以促进裂纹偏转，从而提高脆性结构的强度。
