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Article: Bonding of a self-etching primer to noncarious cervical sclerotic dentin: interfacial ultrastructure and micro-tensile bond strength evaluation

TitleBonding of a self-etching primer to noncarious cervical sclerotic dentin: interfacial ultrastructure and micro-tensile bond strength evaluation
Authors
Issue Date2000
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
The Journal of Adhesive Dentistry, 2000, v. 2 n. 1, p. 9-28 How to Cite?
AbstractPURPOSE: The objectives of this study were 1) to examine the ultrastructural features of the resin-sclerotic dentin interface following the application of Clearfil Liner Bond II sigma to natural cervical wedge-shaped lesions, and 2) to evaluate the regional tensile bond strength of this self-etching primer at different locations on natural and artificially-created cervical lesions. MATERIALS AND METHODS: Deep cervical natural lesions were bonded using the self-etching primer. Micromorphology of the bonded interface at different locations within the lesions were examined using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and scanning transmission electron microscopy/energy dispersive x-ray analysis (STEM/EDX). Ultrastructural features were further compared with the use of the same self-etching primer on artificial lesions created in sound cervical dentin. A nontrimming technique was used to evaluate the regional tensile bond strength from the occlusal, gingival, and the deepest central part of both natural and artificial cervical lesions. Beams with a mean area of 0.46 +/- 0.03 mm2 were prepared and were pulled to failure using a Bencor Multi-T testing device attached to an Instron universal tester. Bond strength results were evaluated using a two-way ANOVA design. RESULTS: A hypermineralized layer devoid of intact, banded collagen was invariably present on the surface of the natural lesions. Depending upon its thickness at different locations of the lesion, the action of a self-etching primer may be limited to this surface layer alone, producing a hybridized hypermineralized surface layer. Penetration of the self-etching primer into the underlying sclerotic dentin produced a hybridized complex containing a hybridized hypermineralized surface layer as well as a subsurface layer of hybridized intertubular dentin. Bacterial colonization of the lesion surface resulted in the formation of an additional zone of hybridized intermicrobial matrix over the surface of the lesions. Dentinal tubules remained blocked with sclerotic casts, and resin tags were rarely observed. Regional tensile bond strength results showed that the overall bond strength to natural sclerotic dentin was about 20% lower than sound cervical dentin, but was independent of the different locations within the lesions from which bond strength was evaluated. CONCLUSION: There were four factors that may have influenced the overall decrease in bond strength in natural cervical sclerotic lesions: a) the presence of a hybridized intermicrobial matrix together with entrapped bacteria may have weakened the bonds, b) inability of a self-etching primer to etch through a thick, hypermineralized surface layer, c) presence of a layer of possibly remineralized, denatured collagen at the base of the hypermineralized surface layer, and d) retention of acid-resistant sclerotic casts that obliterate the tubular lumina and prevent effective resin tag formation.
Persistent Identifierhttp://hdl.handle.net/10722/67257
ISSN
2015 Impact Factor: 1.594
2015 SCImago Journal Rankings: 0.486

 

DC FieldValueLanguage
dc.contributor.authorTay, FRCMen_HK
dc.contributor.authorKwong, SMen_HK
dc.contributor.authorItthagarun, Aen_HK
dc.contributor.authorKing, NMen_HK
dc.contributor.authorYip, HKen_HK
dc.contributor.authorMoulding, KMen_HK
dc.contributor.authorPashley, DHen_HK
dc.date.accessioned2010-09-06T05:53:18Z-
dc.date.available2010-09-06T05:53:18Z-
dc.date.issued2000en_HK
dc.identifier.citationThe Journal of Adhesive Dentistry, 2000, v. 2 n. 1, p. 9-28en_HK
dc.identifier.issn1461-5185en_HK
dc.identifier.urihttp://hdl.handle.net/10722/67257-
dc.description.abstractPURPOSE: The objectives of this study were 1) to examine the ultrastructural features of the resin-sclerotic dentin interface following the application of Clearfil Liner Bond II sigma to natural cervical wedge-shaped lesions, and 2) to evaluate the regional tensile bond strength of this self-etching primer at different locations on natural and artificially-created cervical lesions. MATERIALS AND METHODS: Deep cervical natural lesions were bonded using the self-etching primer. Micromorphology of the bonded interface at different locations within the lesions were examined using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and scanning transmission electron microscopy/energy dispersive x-ray analysis (STEM/EDX). Ultrastructural features were further compared with the use of the same self-etching primer on artificial lesions created in sound cervical dentin. A nontrimming technique was used to evaluate the regional tensile bond strength from the occlusal, gingival, and the deepest central part of both natural and artificial cervical lesions. Beams with a mean area of 0.46 +/- 0.03 mm2 were prepared and were pulled to failure using a Bencor Multi-T testing device attached to an Instron universal tester. Bond strength results were evaluated using a two-way ANOVA design. RESULTS: A hypermineralized layer devoid of intact, banded collagen was invariably present on the surface of the natural lesions. Depending upon its thickness at different locations of the lesion, the action of a self-etching primer may be limited to this surface layer alone, producing a hybridized hypermineralized surface layer. Penetration of the self-etching primer into the underlying sclerotic dentin produced a hybridized complex containing a hybridized hypermineralized surface layer as well as a subsurface layer of hybridized intertubular dentin. Bacterial colonization of the lesion surface resulted in the formation of an additional zone of hybridized intermicrobial matrix over the surface of the lesions. Dentinal tubules remained blocked with sclerotic casts, and resin tags were rarely observed. Regional tensile bond strength results showed that the overall bond strength to natural sclerotic dentin was about 20% lower than sound cervical dentin, but was independent of the different locations within the lesions from which bond strength was evaluated. CONCLUSION: There were four factors that may have influenced the overall decrease in bond strength in natural cervical sclerotic lesions: a) the presence of a hybridized intermicrobial matrix together with entrapped bacteria may have weakened the bonds, b) inability of a self-etching primer to etch through a thick, hypermineralized surface layer, c) presence of a layer of possibly remineralized, denatured collagen at the base of the hypermineralized surface layer, and d) retention of acid-resistant sclerotic casts that obliterate the tubular lumina and prevent effective resin tag formation.-
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.ispartofThe Journal of Adhesive Dentistryen_HK
dc.subject.meshCalcinosis - pathology-
dc.subject.meshDental Bonding-
dc.subject.meshDentin, Secondary - microbiology - pathology - ultrastructure-
dc.subject.meshDentin-Bonding Agents - chemistry-
dc.subject.meshTooth Cervix - microbiology - pathology - ultrastructure-
dc.titleBonding of a self-etching primer to noncarious cervical sclerotic dentin: interfacial ultrastructure and micro-tensile bond strength evaluationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1461-5185&volume=2&spage=9&epage=28&date=2000&atitle=Bonding+of+a+self-etching+primer+to+noncarious+cervical+sclerotic+dentin:+interfacial+ultrastructure+and+micro-tensile+bond+strength+evaluationen_HK
dc.identifier.emailTay, FRCM: franktay@HKUCC.hku.hken_HK
dc.identifier.emailItthagarun, A: aitthaga@hkusua.hku.hken_HK
dc.identifier.emailKing, NM: profnigelking@mac.comen_HK
dc.identifier.emailYip, HK: kevin.h.k.yip@hkusua.hku.hken_HK
dc.identifier.authorityKing, NM=rp00006en_HK
dc.identifier.authorityYip, HK=rp00027en_HK
dc.identifier.pmid11317411-
dc.identifier.scopuseid_2-s2.0-0034158369-
dc.identifier.hkuros48588en_HK
dc.identifier.issue1-
dc.identifier.spage9-
dc.identifier.epage28-

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