Effect of four over-the-counter tooth-whitening products on enamel microhardness

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dc.contributor.authorMajeed, Abdul
dc.contributor.authorGrobler, Sias Renier
dc.contributor.authorMoola, Mohamad H.
dc.contributor.authorOberholzer, Theunis
dc.date.accessioned2013-05-15T11:06:37Z
dc.date.available2013-05-15T11:06:37Z
dc.date.issued2011
dc.description.abstractOBJECTIVES: This in vitro study evaluated the effect of four over-the-counter tooth-whitening products on enamel microhardness. METHODS: Fifty enamel blocks were prepared from extracted human molar teeth. The enamel surfaces were polished up to 1200 grit fineness and the specimens randomly divided into five groups. Enamel blocks were exposed to: Rapid White (n=10); Absolute White (n=10); Speed White (n=10) and White Glo (n=10) whitening products, according to the manufacturers' instructions. As control, ten enamel blocks were kept in artificial saliva at 37 degrees C without any treatment. Microhardness values were obtained before exposure (baseline) and after 1, 7 and 14-day treatment periods using a digital hardness tester with a Vickers diamond indenter. Data were analysed using Wilcoxon Signed Rank Sum Test, one-way ANOVA and Tukey-Kramer Multiple Comparison Test (p<0.05). RESULTS: Both Rapid White and Absolute White reduced enamel microhardness. Speed White increased the microhardness of enamel, while White Glo and artificial saliva had no effect on hardness. CONCLUSIONS: Over-the-counter tooth-whitening products might decrease enamel microhardness depending on the type of product.en_US
dc.description.accreditationDepartment of HE and Training approved listen_US
dc.identifier.citationMajeed, A., et al. (2011). Effect of four over-the-counter tooth-whitening products on enamel microhardness. South African Dental Journal, 66(9): 412 - 415en_US
dc.identifier.issn1029-4864
dc.identifier.urihttp://hdl.handle.net/10566/616
dc.language.isoenen_US
dc.privacy.showsubmitterfalse
dc.publisherSouth African Dental Associationen_US
dc.rightsThis file may be freely used for educational uses. No commercial reproduction or distribution of this file is permitted without written permission of the South African Dental Association (SADA). Note that the SADA retains all intellectual property rights in the article.
dc.status.ispeerreviewedtrue
dc.subjectTooth-whiteningen_US
dc.subjectEnamelen_US
dc.subjectMicrohardnessen_US
dc.subjectOver-the-counteren_US
dc.subjectPeroxideen_US
dc.subjectSodium Chlorideen_US
dc.titleEffect of four over-the-counter tooth-whitening products on enamel microhardnessen_US
dc.typeArticleen_US

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