Theocharopoulos Antonios L, Bushby Andrew J, P'ng Ken My, Wilson Rory M, Tanner K Elizabeth, Cattell Michael J
School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, Mile End, London, UK.; Cork University Dental School and Hospital, Wilton, Cork, Ireland.
School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, Mile End, London, UK.
J Adv Prosthodont. 2016 Dec;8(6):479-488. doi: 10.4047/jap.2016.8.6.479. Epub 2016 Dec 15.
The aim of this study was to test the modulus of elasticity () across the interfaces of yttria stabilized zirconia (YTZP) / veneer multilayers using nanoindentation.
YTZP core material (KaVo-Everest, Germany) specimens were either coated with a liner (IPS e.max ZirLiner, Ivoclar-Vivadent) (Type-1) or left as-sintered (Type-2) and subsequently veneered with a pressable glass-ceramic (IPS e.max ZirPress, Ivoclar-Vivadent). A 5 µm (nominal tip diameter) spherical indenter was used with a UMIS CSIRO 2000 (ASI, Canberra, Australia) nanoindenter system to test across the exposed and polished interfaces of both specimen types. The multiple point load - partial unload method was used for determination. All materials used were characterized using Scanning Electron Microscopy (SEM) and X - ray powder diffraction (XRD). mappings of the areas tested were produced from the nanoindentation data.
A significantly (<.05) lower value between Type-1 and Type-2 specimens at a distance of 40 µm in the veneer material was associated with the liner. XRD and SEM characterization of the zirconia sample showed a fine grained bulk tetragonal phase. IPS e-max ZirPress and IPS e-max ZirLiner materials were characterized as amorphous.
The liner between the YTZP core and the heat pressed veneer may act as a weak link in this dental multilayer due to its significantly (<.05) lower . The present study has shown nanoindentation using spherical indentation and the multiple point load - partial unload method to be reliable predictors of and useful evaluation tools for layered dental ceramic interfaces.
本研究旨在使用纳米压痕测试氧化钇稳定氧化锆（YTZP）/贴面多层材料界面的弹性模量（ ）。
YTZP核心材料（德国卡瓦依威盛）标本，要么涂有内衬（义获嘉e.max ZirLiner，义获嘉伟瓦登特）（1型），要么烧结后保留原样（2型），随后用可压注玻璃陶瓷（义获嘉e.max ZirPress，义获嘉伟瓦登特）进行贴面处理。使用一个5微米（标称尖端直径）的球形压头，与UMIS CSIRO 2000（澳大利亚堪培拉ASI）纳米压痕系统一起，测试两种标本类型暴露和抛光界面处的 。采用多点加载 - 部分卸载法测定 。使用扫描电子显微镜（SEM）和X射线粉末衍射（XRD）对所有使用的材料进行表征。根据纳米压痕数据生成测试区域的 映射图。
在贴面材料中距离40微米处，1型和2型标本之间的 值显著（<0.05）较低，这与内衬有关。氧化锆样品的XRD和SEM表征显示为细晶块状四方相。义获嘉e-max ZirPress和义获嘉e-max ZirLiner材料被表征为非晶态。
YTZP核心与热压贴面之间的内衬可能由于其显著（<0.05）较低的 而成为这种牙科多层材料中的薄弱环节。本研究表明，使用球形压痕的纳米压痕和多点加载 - 部分卸载法是 的可靠预测方法，也是用于分层牙科陶瓷界面的有用评估工具。
