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Article: How can nanoleakage occur in self-etching adhesive systems that demineralize and infiltrate simultaneously?

TitleHow can nanoleakage occur in self-etching adhesive systems that demineralize and infiltrate simultaneously?
Authors
Issue Date2002
PublisherQuintessence Publishing Co Ltd. The Journal's web site is located at http://www.quintessencepublishing.co.uk/catalog/product_info.php?cPath=3&products_id=243
Citation
Journal Of Adhesive Dentistry, 2002, v. 4 n. 4, p. 255-269 How to Cite?
AbstractPurpose: Single-step adhesives which etch and prime simultaneously and are not rinsed should not exhibit areas of incomplete infiltration within hybrid layers produced in sound dentin. This study examined the extent of silver uptake using ammoniacal silver nitrate in three two-step, self-etching primers (Imperva Fluoro Bond, Shofu; UniFil Bond, GC, ABF system, Kuraray) and one single-step, self-etching adhesive (AQ Bond, Sun Medical) bonded to dentin and four poly(HEMA) resins used as controls. Materials and Methods: Flat dentin surfaces were bonded with these adhesives and sectioned into 0.8-mm-thick slabs that were then coated with nail varnish except for the bonded interfaces and immersed in AgNO3 for 24 h. Four types of poly(HEMA) resins were made: 100% HEMA; 90% HEMA-10% water; 75% HEMA-10% water, all polymerized with TBBO at 50°C for 6 h; 100% HEMA polymerized at 25°C for 30 min. After developing, undemineralized, unstained, epoxy resin-embedded sections were prepared for TEM. Results: Nanoleakage patterns were observed in all bonded specimens. Fine segregated silver particles and reticular silver-staining patterns were found within the thin hybrid layers created by the three self-etching primers. For the single-step, self-etching adhesive, heavy silver deposits were identified within the hybridized complex formed by this adhesive within the smear layer, the underlying intact dentin, and in the adhesive layer. Increasing amounts of silver uptake were observed in poly(HEMA) specimens containing more water or that were polymerized at 25°C for a short time instead of 50°C for 6 h. Conclusions: Silver uptake in hybrid layers formed by self-etching adhesives in sound dentin is not necessarily caused by disparities between the depths of demineralization and resin infiltration. They represent areas of increased permeability within a polymerized resin matrix in which water is incompletely removed resulting in regions of incomplete polymerization and/or hydrogel formation.
Persistent Identifierhttp://hdl.handle.net/10722/66745
ISSN
2015 Impact Factor: 1.594
2015 SCImago Journal Rankings: 0.486
References

 

DC FieldValueLanguage
dc.contributor.authorTay, FRen_HK
dc.contributor.authorKing, NMen_HK
dc.contributor.authorChan, KMen_HK
dc.contributor.authorPashley, DHen_HK
dc.date.accessioned2010-09-06T05:48:59Z-
dc.date.available2010-09-06T05:48:59Z-
dc.date.issued2002en_HK
dc.identifier.citationJournal Of Adhesive Dentistry, 2002, v. 4 n. 4, p. 255-269en_HK
dc.identifier.issn1461-5185en_HK
dc.identifier.urihttp://hdl.handle.net/10722/66745-
dc.description.abstractPurpose: Single-step adhesives which etch and prime simultaneously and are not rinsed should not exhibit areas of incomplete infiltration within hybrid layers produced in sound dentin. This study examined the extent of silver uptake using ammoniacal silver nitrate in three two-step, self-etching primers (Imperva Fluoro Bond, Shofu; UniFil Bond, GC, ABF system, Kuraray) and one single-step, self-etching adhesive (AQ Bond, Sun Medical) bonded to dentin and four poly(HEMA) resins used as controls. Materials and Methods: Flat dentin surfaces were bonded with these adhesives and sectioned into 0.8-mm-thick slabs that were then coated with nail varnish except for the bonded interfaces and immersed in AgNO3 for 24 h. Four types of poly(HEMA) resins were made: 100% HEMA; 90% HEMA-10% water; 75% HEMA-10% water, all polymerized with TBBO at 50°C for 6 h; 100% HEMA polymerized at 25°C for 30 min. After developing, undemineralized, unstained, epoxy resin-embedded sections were prepared for TEM. Results: Nanoleakage patterns were observed in all bonded specimens. Fine segregated silver particles and reticular silver-staining patterns were found within the thin hybrid layers created by the three self-etching primers. For the single-step, self-etching adhesive, heavy silver deposits were identified within the hybridized complex formed by this adhesive within the smear layer, the underlying intact dentin, and in the adhesive layer. Increasing amounts of silver uptake were observed in poly(HEMA) specimens containing more water or that were polymerized at 25°C for a short time instead of 50°C for 6 h. Conclusions: Silver uptake in hybrid layers formed by self-etching adhesives in sound dentin is not necessarily caused by disparities between the depths of demineralization and resin infiltration. They represent areas of increased permeability within a polymerized resin matrix in which water is incompletely removed resulting in regions of incomplete polymerization and/or hydrogel formation.en_HK
dc.languageengen_HK
dc.publisherQuintessence Publishing Co Ltd. The Journal's web site is located at http://www.quintessencepublishing.co.uk/catalog/product_info.php?cPath=3&products_id=243en_HK
dc.relation.ispartofJournal of Adhesive Dentistryen_HK
dc.subject.meshAcid Etching, Dentalen_HK
dc.subject.meshAdhesives - chemistryen_HK
dc.subject.meshDental Leakage - etiologyen_HK
dc.subject.meshDentin - ultrastructureen_HK
dc.subject.meshDentin Permeabilityen_HK
dc.subject.meshDentin-Bonding Agents - chemistryen_HK
dc.subject.meshHumansen_HK
dc.subject.meshMethacrylates - chemistryen_HK
dc.subject.meshMicroscopy, Electronen_HK
dc.subject.meshMolaren_HK
dc.subject.meshResin Cements - chemistryen_HK
dc.subject.meshSilver - chemistryen_HK
dc.subject.meshSilver Stainingen_HK
dc.subject.meshTooth Demineralizationen_HK
dc.titleHow can nanoleakage occur in self-etching adhesive systems that demineralize and infiltrate simultaneously?en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1461-5185&volume=4&issue=4&spage=255&epage=269&date=2002&atitle=How+can+nanoleakage+occur+in+self-etching+adhesive+systems+that+demineralize+and+infiltrate+simultaneously?en_HK
dc.identifier.emailKing, NM: hhdbknm@hkucc.hku.hken_HK
dc.identifier.authorityKing, NM=rp00006en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.pmid12666745-
dc.identifier.scopuseid_2-s2.0-0037640986en_HK
dc.identifier.hkuros76156en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037640986&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume4en_HK
dc.identifier.issue4en_HK
dc.identifier.spage255en_HK
dc.identifier.epage269en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridTay, FR=7102091962en_HK
dc.identifier.scopusauthoridKing, NM=7201762850en_HK
dc.identifier.scopusauthoridChan, KM=8959892800en_HK
dc.identifier.scopusauthoridPashley, DH=35448600800en_HK

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