Measurement of microstrains across loaded resin-dentin interfaces using microscopic moiré interferometry.
Measurement of microstrains across loaded resin-dentin interfaces using microscopic moiré interferometry.
复制标题
使用显微莫尔干涉测量法测量加载的树脂-牙本质界面上的微应变。
DOI：
10.1016/j.dental.2007.10.005
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Pashley,DavidH
中科院分区：
文献类型：
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作者：
Wood,JudyD;Sobolewski,Paul;Thakur,Varun;Arola,Dwayne;Nazari,Ahmed;Tay,FranklinR;Pashley,DavidH
对树脂-牙本质界面在加载过程中的力学行为了解甚少。在较硬的牙本质和树脂复合材料之间存在相对柔顺的杂化层和粘接层，在压缩载荷下变形更大。目的利用最新研制的显微显微干涉仪实时测量牙本质界面微应变的变化。方法该系统采用微型涡流干涉仪、两台CCD相机同时记录纵向和横向变形场、压电换能器进行条纹移位，并使用放大倍数高达600倍的显微镜物镜。将湿树脂粘合牙本质的小光束（1mm×2mm×6mm）置于微型压缩测试仪中，允许从2到37N的可控载荷，同时对干涉条纹图案进行成像。结果在压缩载荷作用下，单键/Z100粘接牙本质形成的树脂-牙本质界面表现出较大的应变。当包裹的相图被解开以允许条纹顺序转换为位移时，应变场的二维剖面显示出跨粘合剂界面的非均匀应变。在粘接/杂化层区，负应变大于相邻树脂复合层或下卧矿化牙本质区（−6000μ /）。这些变化是有弹性的，因为当负载被移除时，它们就消失了。意义：微观干涉测量在揭示载荷作用下粘结界面的实时应变方面非常有用。
Little is known about the mechanical behavior of resin–dentin interfaces during loading. The presence of relatively compliant hybrid and adhesive layers between stiffer dentin and resin composite should deform more during compressive loading.OBJECTIVEThe objective of this study was to measure changes in microstrain across bonded dentin interfaces in real time using a recently developed microscope moiré interferometer.METHODThis system used a miniature moiré interferometer, using two CCD cameras for simultaneous recording of longitudinal and transverse deformation fields, a piezotransducer for fringe shifting and use of a microscope objective with magnification up to 600×. Small beams (1mm×2mm×6mm) of moist resin-bonded dentin covered with cross-lined diffraction grating replica were placed in a miniature compression tester to allow controlled loading from 2 to 37N while imaging the interference fringe patterns.RESULTSResin-dentin interfaces created by bonding dentin with Single Bond/Z100, under compressive loading, exhibited comparatively large strains across the adhesive–hybrid interface. When the wrapped phase maps were unwrapped to permit conversion of fringe order to displacements, the 2-D profiles of strain fields revealed non-uniform strains across the adhesive interface. In the adhesive/hybrid layer zone, the negative strain was larger (i.e. −6000μɛ) than that seen in the adjacent resin composite or underlying mineralized dentin. The changes were elastic because they disappeared when the load was removed.SIGNIFICANCEMicroscopic moiré interferometry can be very useful in revealing real-time strain across bonded interfaces under load.