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Article: Microhardness of dentine in primary teeth after topical fluoride applications

TitleMicrohardness of dentine in primary teeth after topical fluoride applications
Authors
KeywordsDentine
Fluoride
Microhardness
Issue Date2008
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdent
Citation
Journal Of Dentistry, 2008, v. 36 n. 6, p. 387-391 How to Cite?
AbstractObjectives: This study measured the microhardness of arrested dentinal caries on primary teeth receiving regular fluoride applications after 30 months. Methods: Caries on primary upper anterior teeth of preschool children were randomly assigned to receive 38% silver diamine fluoride every 12 months or 5% sodium fluoride varnish every 3 months. Lesions that were hard on probing were considered arrested. At 30 months, very mobile teeth were extracted, sectioned, and polished and they underwent Knoop hardness number (KHN) measurements at sites below the surface at the center of the carious lesion every 25 μm toward the pulp. Three sets of measurements were made on parallel tracks approximately 150-200 μm apart, and the median KHN at each depth were analyzed. Results: Five arrested and five soft carious lesions were examined. Within the outer 25-200 μm, the median KHN of arrested carious lesions (range, 20-46 or 196-451 MPa) were greater than those of soft carious lesions (range, 5-20, or 49-196 MPa). The difference between them, however, was not statistically significant. At a distance of 225 μm or more from the surface of the lesion, the median KHN of both groups were between 20 and 30 (196-294 MPa). Conclusions: The outermost dentinal surface of carious lesions that had been arrested by topical fluoride application was harder than that of active carious lesions. At a distance of 225 μm or more from the lesion surface, the microhardness of both arrested and soft dentinal caries was similar. © 2008 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/67101
ISSN
2015 Impact Factor: 3.109
2015 SCImago Journal Rankings: 1.029
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChu, CHen_HK
dc.contributor.authorLo, ECMen_HK
dc.date.accessioned2010-09-06T05:51:58Z-
dc.date.available2010-09-06T05:51:58Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Dentistry, 2008, v. 36 n. 6, p. 387-391en_HK
dc.identifier.issn0300-5712en_HK
dc.identifier.urihttp://hdl.handle.net/10722/67101-
dc.description.abstractObjectives: This study measured the microhardness of arrested dentinal caries on primary teeth receiving regular fluoride applications after 30 months. Methods: Caries on primary upper anterior teeth of preschool children were randomly assigned to receive 38% silver diamine fluoride every 12 months or 5% sodium fluoride varnish every 3 months. Lesions that were hard on probing were considered arrested. At 30 months, very mobile teeth were extracted, sectioned, and polished and they underwent Knoop hardness number (KHN) measurements at sites below the surface at the center of the carious lesion every 25 μm toward the pulp. Three sets of measurements were made on parallel tracks approximately 150-200 μm apart, and the median KHN at each depth were analyzed. Results: Five arrested and five soft carious lesions were examined. Within the outer 25-200 μm, the median KHN of arrested carious lesions (range, 20-46 or 196-451 MPa) were greater than those of soft carious lesions (range, 5-20, or 49-196 MPa). The difference between them, however, was not statistically significant. At a distance of 225 μm or more from the surface of the lesion, the median KHN of both groups were between 20 and 30 (196-294 MPa). Conclusions: The outermost dentinal surface of carious lesions that had been arrested by topical fluoride application was harder than that of active carious lesions. At a distance of 225 μm or more from the lesion surface, the microhardness of both arrested and soft dentinal caries was similar. © 2008 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdenten_HK
dc.relation.ispartofJournal of Dentistryen_HK
dc.subjectDentineen_HK
dc.subjectFluorideen_HK
dc.subjectMicrohardnessen_HK
dc.subject.meshCariostatic Agents - therapeutic use-
dc.subject.meshDental Caries - drug therapy-
dc.subject.meshDentin - anatomy and histology-
dc.subject.meshFluorides, Topical - therapeutic use-
dc.subject.meshTooth, Deciduous - anatomy and histology-
dc.titleMicrohardness of dentine in primary teeth after topical fluoride applicationsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0300-5712&volume=36&spage=387&epage=391&date=2008&atitle=Micro-hardness+of+dentine+in+primary+teeth+after+topical+fluoride+applicationsen_HK
dc.identifier.emailChu, CH:chchu@hku.hken_HK
dc.identifier.emailLo, ECM:hrdplcm@hkucc.hku.hken_HK
dc.identifier.authorityChu, CH=rp00022en_HK
dc.identifier.authorityLo, ECM=rp00015en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jdent.2008.02.013en_HK
dc.identifier.pmid18378377-
dc.identifier.scopuseid_2-s2.0-43049183435en_HK
dc.identifier.hkuros146831en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-43049183435&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume36en_HK
dc.identifier.issue6en_HK
dc.identifier.spage387en_HK
dc.identifier.epage391en_HK
dc.identifier.eissn1879-176X-
dc.identifier.isiWOS:000256538000002-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridChu, CH=7404345729en_HK
dc.identifier.scopusauthoridLo, ECM=7101705982en_HK

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