en ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research Objectives <p> We investigated the elastic properties of one dental restoration resin composite of common use, Venus Diamond, at submicrometer spatial resolution.</p>Methods <p> We performed both nanoindentation experiments with atomic force microscopy, and microindentation experiments with a traditional indenter setup. We also used scanning electron microscopy and energy dispersive X-rays spectroscopy to better understand the correlation between properties and microscopic structure and composition.</p>Results <p> With atomic force microscopy we obtained quantitative evaluation of the elastic modulus (10.8<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >±<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >4.3<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >GPa), in agreement with the microindentation value (reduced modulus of 12.7<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >±<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >2.0<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >GPa), and by microindentation we also obtained an hardness value (460<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >±<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >109<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >MPa) compatible in turn with the nominal value provided by the material manufacturer (<i>H</i><img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >∼<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >578<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >MPa). The nanoindentation also revealed that no relevant difference in elasticity appears between the 5 and 10<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >μm diameter filler particles and the surrounding areas, showing an excellent uniformity of the composite. In support of this finding, compositional uniformity of the material was also observed by X-rays spectroscopy. We conclude that the composite contains prepolymerized particles.</p>Significance <p> We demonstrate that, in addition to reliable quantitative analysis, the high resolution and two-dimensional mapping capability of atomic force microscopy allows for advanced insights into the microstructure of the composite that are not accessible via traditional microindentation.</p><hr><p></p><p> <strong> Source: </strong>Dental Materials </p><p><a href="http://www.demajournal.com/article/S0109-5641(11)00870-0/abstract" target="_blank"><font color="#0000cc">  Full text </font></a></p> Dental material, Resin composite, Midifill, Scanning electron microscopy, Microanalysis, Atomic force microscopy, Nanoindentation, Elastic modulus, Hardness 0 0 http://idai.ir/browse.php?a_code=A-10-32-256&slc_lang=en&sid=1 • Marco • Salerno 10031947532846001030 10031947532846001030 Yes • Niranjan • Patra 10031947532846001031 10031947532846001031 No • Alberto • Diaspro 10031947532846001032 10031947532846001032 No