Characterization of Indentation Impressions on Human Enamel For Hardness Measurement

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dc.contributor.authorZhang, G.en_US
dc.contributor.authorLe, Dung T.en_US
dc.contributor.authorTucker, S.R.en_US
dc.contributor.authorNg, S.J.en_US
dc.contributor.departmentISRen_US
dc.date.accessioned2007-05-23T10:03:41Z
dc.date.available2007-05-23T10:03:41Z
dc.date.issued1997en_US
dc.description.abstractThis paper presents results from investigating indentation impressions on human enamel under micro-hardness tests. The experiments of hardness testing were performed on a microhardness indentation machine under different loading conditions. Images of indentation impressions were obtained using an environmental scanning electron microscope. Geometrical shapes of hardness indentations were visualized in three-dimensional space using computer graphics. Quantitative information was obtained through atomic force measurements to characterize "pile-up", "sink-in", and elastic recovery of enamel. Special efforts have been made to study the microstrucutual effect of the calcified rods orientations on the fracture patterns formed during the hardness tests. Significant findings include that the occlusal surface demonstrates much stronger resistance to the indentation force than does the buccal surface and shows 40% elastic recovery after indentation. A new formula to determine hardness value has been proposed. By incorporating the reversible deformation into the evluation, a normalized hardness measurement can be made to form a basis for comparison and other investigations where hardness has its unique role to play.<P>en_US
dc.format.extent506752 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/5848
dc.language.isoen_USen_US
dc.relation.ispartofseriesISR; TR 1997-10en_US
dc.subjectimage processingen_US
dc.subjectcomputer visionen_US
dc.subjectmaterials propertiesen_US
dc.subjectmeasurementsen_US
dc.subjectSystems Integration Methodologyen_US
dc.titleCharacterization of Indentation Impressions on Human Enamel For Hardness Measurementen_US
dc.typeTechnical Reporten_US

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