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Article: Use of a novel 9.3-μm carbon dioxide laser and silver diamine fluoride: Prevention of enamel demineralisation and inhibition of cariogenic bacteria

TitleUse of a novel 9.3-μm carbon dioxide laser and silver diamine fluoride: Prevention of enamel demineralisation and inhibition of cariogenic bacteria
Authors
KeywordsSilver diamine fluoride
Laser
Caries
Prevention
Enamel
Issue Date2021
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental
Citation
Dental Materials, 2021, v. 37 n. 6, p. 940-948 How to Cite?
AbstractObjective: To investigate the effects of a 9.3-μm carbon dioxide (CO2) laser and silver diamine fluoride (SDF) on the prevention of enamel demineralisation and inhibition of cariogenic bacteria. Methods: Enamel blocks were applied with Laser (Group-1), SDF (Group-2), Laser + SDF (Group-3) and no treatment (Group-4), and then subjected to an 8-day pH-cycling for cariogenic challenge. Lesion depth and cross-sectional micro-hardness were assessed. Surface morphological and chemical changes were studied using scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS). For the antibacterial activity, treated enamel blocks were incubated with Streptococcus mutans. The biofilm morphology, kinetics and viability were assessed by SEM, colony-forming units (CFUs) and confocal laser scanning microscope (CLSM), respectively. Results: Lesion depths (μm) for Group-1 to Group-4 were 88 ± 21, 26 ± 11, 13 ± 9 and 115 ± 25, respectively (p < 0.001; Group-2 and Group-3 < Group-1 < Group-4). Group-3 had a significantly higher cross-sectional micro-hardness than the other three groups. EDS determined that Group-4 had the lowest calcium-to-phosphorus molar ratio among the groups (p < 0.001). SEM images showed apparent bacteria accumulation on enamel surfaces in Group-4, but not in other groups. Log CFUs for Group-1 to Group-4 were 6.2 ± 0.6, 2.9 ± 0.8, 2.2 ± 1.1 and 7.3 ± 0.3, respectively (p < 0.001; Group-2 and Group-3 < Group-1 < Group-4). CLSM images revealed that live bacteria dominated in Group-4, but not in other groups. Significance: The irradiation with a 9.3-μm CO2 laser alone can prevent the demineralisation of enamel and reduce the adhesion of cariogenic bacteria. Moreover, adding SDF can significantly increase the preventive effect and antibacterial ability.
DescriptionHybrid open access
Persistent Identifierhttp://hdl.handle.net/10722/298696
ISSN
2021 Impact Factor: 5.687
2020 SCImago Journal Rankings: 1.770
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhao, IS-
dc.contributor.authorXue, VW-
dc.contributor.authorYin, IX-
dc.contributor.authorNiu, JY-
dc.contributor.authorLo, ECM-
dc.contributor.authorChu, CH-
dc.date.accessioned2021-04-12T03:02:08Z-
dc.date.available2021-04-12T03:02:08Z-
dc.date.issued2021-
dc.identifier.citationDental Materials, 2021, v. 37 n. 6, p. 940-948-
dc.identifier.issn0109-5641-
dc.identifier.urihttp://hdl.handle.net/10722/298696-
dc.descriptionHybrid open access-
dc.description.abstractObjective: To investigate the effects of a 9.3-μm carbon dioxide (CO2) laser and silver diamine fluoride (SDF) on the prevention of enamel demineralisation and inhibition of cariogenic bacteria. Methods: Enamel blocks were applied with Laser (Group-1), SDF (Group-2), Laser + SDF (Group-3) and no treatment (Group-4), and then subjected to an 8-day pH-cycling for cariogenic challenge. Lesion depth and cross-sectional micro-hardness were assessed. Surface morphological and chemical changes were studied using scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS). For the antibacterial activity, treated enamel blocks were incubated with Streptococcus mutans. The biofilm morphology, kinetics and viability were assessed by SEM, colony-forming units (CFUs) and confocal laser scanning microscope (CLSM), respectively. Results: Lesion depths (μm) for Group-1 to Group-4 were 88 ± 21, 26 ± 11, 13 ± 9 and 115 ± 25, respectively (p < 0.001; Group-2 and Group-3 < Group-1 < Group-4). Group-3 had a significantly higher cross-sectional micro-hardness than the other three groups. EDS determined that Group-4 had the lowest calcium-to-phosphorus molar ratio among the groups (p < 0.001). SEM images showed apparent bacteria accumulation on enamel surfaces in Group-4, but not in other groups. Log CFUs for Group-1 to Group-4 were 6.2 ± 0.6, 2.9 ± 0.8, 2.2 ± 1.1 and 7.3 ± 0.3, respectively (p < 0.001; Group-2 and Group-3 < Group-1 < Group-4). CLSM images revealed that live bacteria dominated in Group-4, but not in other groups. Significance: The irradiation with a 9.3-μm CO2 laser alone can prevent the demineralisation of enamel and reduce the adhesion of cariogenic bacteria. Moreover, adding SDF can significantly increase the preventive effect and antibacterial ability.-
dc.languageeng-
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental-
dc.relation.ispartofDental Materials-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectSilver diamine fluoride-
dc.subjectLaser-
dc.subjectCaries-
dc.subjectPrevention-
dc.subjectEnamel-
dc.titleUse of a novel 9.3-μm carbon dioxide laser and silver diamine fluoride: Prevention of enamel demineralisation and inhibition of cariogenic bacteria-
dc.typeArticle-
dc.identifier.emailYin, IX: irisxyin@hku.hk-
dc.identifier.emailLo, ECM: edward-lo@hku.hk-
dc.identifier.emailChu, CH: chchu@hku.hk-
dc.identifier.authorityLo, ECM=rp00015-
dc.identifier.authorityChu, CH=rp00022-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1016/j.dental.2021.02.017-
dc.identifier.pmid33707067-
dc.identifier.scopuseid_2-s2.0-85102264573-
dc.identifier.hkuros322123-
dc.identifier.volume37-
dc.identifier.issue6-
dc.identifier.spage940-
dc.identifier.epage948-
dc.identifier.isiWOS:000653047600002-
dc.publisher.placeUnited States-

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