In vitro demineralization of human enamel natural and abraded surfaces: a micromechanical and SEM investigation

Journal of Dentistry
Jing XueM V Swain

Abstract

To compare the demineralization pattern that occurs in abraded samples and unabraded ones quantitatively and microscopically using nanoindentation and SEM. Using 12 human third molars, one half of each tooth was abraded to a depth approximately 200 microm below the outer surface enamel, and the other half was left untreated. All specimens were demineralized for 3d, 5d, 7d and 14d respectively. The cross sections of all lesions were evaluated with nanoindentation and SEM. Unabraded samples had least loss of mechanical properties and lesion depth compared to abraded samples, with most mechanical property loss occurring within a shallower layer of the lesion. The variation of mechanical properties in unabraded samples was wider than abraded samples. SEM images showed a characteristic "keyhole" structure for both samples after demineralization, with the rod core extensively demineralized while the interrod remained intact. Acid attack initiated at the rod sheath space then penetrated into the rod core before extending into neighbouring rods through the rod tail. Abraded samples exposed to in vitro demineralization form deeper lesion depths and greater loss of mechanical properties than unabraded samples subjected to the same demine...Continue Reading

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Citations

May 11, 2013·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Elizabeta S GjorgievskaMarija M Stevanovic
Mar 27, 2010·Archives of Oral Biology·Reina TanakaTakashi Miyazaki
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Dec 15, 2010·Archives of Oral Biology·Li-Hong HeDavid G Purton
Jul 10, 2017·Clinical Oral Investigations·Mauricio Neves GomesCarlos Eduardo Francci
Jul 2, 2019·Microscopy Research and Technique·Steinar Risnes, Chunfang Li
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Oct 12, 2018·Dental Materials : Official Publication of the Academy of Dental Materials·Nancie CougotJérome Chevalier

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