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Article: Effects of Dentin Depth and Cavity Configuration on Bond Strength

TitleEffects of Dentin Depth and Cavity Configuration on Bond Strength
Authors
Issue Date1999
PublisherSage Publications, Inc.. The Journal's web site is located at http://www.sagepub.com/journalsProdDesc.nav?prodId=Journal201925
Citation
Journal Of Dental Research, 1999, v. 78 n. 4, p. 898-905 How to Cite?
AbstractDuring polymerization of resin composites, shrinkage stresses compete with resin-dentin bonds in a manner that can cause failure of the bond, depending upon the configuration of the cavity, its depth, and the restorative technique. The hypothesis tested in this study was that the effect of cavity configuration (C) and remaining dentin thickness (RDT) influence resin bond strength to the dentin of Class I cavity floors. The occlusal enamel was ground to expose a flat superficial dentin surface as a control (superficial dentin, C-factor = 1) in human extracted third molars. Cavities 3 mm long × 4 mm wide were prepared to a depth 2 mm below the ground dentin surfaces (deep dentin within cavity floor, C-factor = 3). To assess the relationship between C-factor and RDT, we removed the walls of cavities, making a deep flat surface for bonding (deep dentin, C-factor = 1). The teeth were restored with either Clearfil Liner Bond II (LB II), One-Step (OS), or Super-Bond D Liner (DL), followed by Clearfil Photo Posterior resin composite. After 24 hrs' storage in water, the teeth were sectioned vertically into 3 or 4 slabs (0.7 mm thick) and trimmed for the micro-tensile bond test so that we could determine the strength of the resin bonds to the pulpal floor. All groups gave high bond strengths to superficial dentin, but OS and DL gave significantly lower bond strengths to flat deep dentin when the C-factor was 1. When the C-factor was increased to 3 by the creation of a three-dimensional cavity preparation, the bond strengths of all materials fell (range, 21 to 35%), but the difference was significant (p < 0.05) only with DL. SEM observations of failure patterns showed that specimens with high bond strengths tended to exhibit cohesive failures within the hybrid layer, while specimens exhibiting low bond strengths showed failures at the top of the hybrid layer. Some adhesives do not bond well to deep dentin, making them more susceptible to polymerization shrinkage stress that develops in cavities with high C-factors. Key words: resin composites, C-factor, dentin depth, shrinkage stress, dentin bonding.
Persistent Identifierhttp://hdl.handle.net/10722/154075
ISSN
2015 Impact Factor: 4.602
2015 SCImago Journal Rankings: 1.714
References

 

DC FieldValueLanguage
dc.contributor.authorYoshikawa, Ten_US
dc.contributor.authorSano, Hen_US
dc.contributor.authorBurrow, MEen_US
dc.contributor.authorTagami, Jen_US
dc.contributor.authorPashley, DHen_US
dc.date.accessioned2012-08-08T08:23:08Z-
dc.date.available2012-08-08T08:23:08Z-
dc.date.issued1999en_US
dc.identifier.citationJournal Of Dental Research, 1999, v. 78 n. 4, p. 898-905en_US
dc.identifier.issn0022-0345en_US
dc.identifier.urihttp://hdl.handle.net/10722/154075-
dc.description.abstractDuring polymerization of resin composites, shrinkage stresses compete with resin-dentin bonds in a manner that can cause failure of the bond, depending upon the configuration of the cavity, its depth, and the restorative technique. The hypothesis tested in this study was that the effect of cavity configuration (C) and remaining dentin thickness (RDT) influence resin bond strength to the dentin of Class I cavity floors. The occlusal enamel was ground to expose a flat superficial dentin surface as a control (superficial dentin, C-factor = 1) in human extracted third molars. Cavities 3 mm long × 4 mm wide were prepared to a depth 2 mm below the ground dentin surfaces (deep dentin within cavity floor, C-factor = 3). To assess the relationship between C-factor and RDT, we removed the walls of cavities, making a deep flat surface for bonding (deep dentin, C-factor = 1). The teeth were restored with either Clearfil Liner Bond II (LB II), One-Step (OS), or Super-Bond D Liner (DL), followed by Clearfil Photo Posterior resin composite. After 24 hrs' storage in water, the teeth were sectioned vertically into 3 or 4 slabs (0.7 mm thick) and trimmed for the micro-tensile bond test so that we could determine the strength of the resin bonds to the pulpal floor. All groups gave high bond strengths to superficial dentin, but OS and DL gave significantly lower bond strengths to flat deep dentin when the C-factor was 1. When the C-factor was increased to 3 by the creation of a three-dimensional cavity preparation, the bond strengths of all materials fell (range, 21 to 35%), but the difference was significant (p < 0.05) only with DL. SEM observations of failure patterns showed that specimens with high bond strengths tended to exhibit cohesive failures within the hybrid layer, while specimens exhibiting low bond strengths showed failures at the top of the hybrid layer. Some adhesives do not bond well to deep dentin, making them more susceptible to polymerization shrinkage stress that develops in cavities with high C-factors. Key words: resin composites, C-factor, dentin depth, shrinkage stress, dentin bonding.en_US
dc.languageengen_US
dc.publisherSage Publications, Inc.. The Journal's web site is located at http://www.sagepub.com/journalsProdDesc.nav?prodId=Journal201925en_US
dc.relation.ispartofJournal of Dental Researchen_US
dc.titleEffects of Dentin Depth and Cavity Configuration on Bond Strengthen_US
dc.typeArticleen_US
dc.identifier.emailBurrow, ME:mfburr58@hku.hken_US
dc.identifier.authorityBurrow, ME=rp01306en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0033278227en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033278227&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume78en_US
dc.identifier.issue4en_US
dc.identifier.spage898en_US
dc.identifier.epage905en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridYoshikawa, T=7402717952en_US
dc.identifier.scopusauthoridSano, H=7403159147en_US
dc.identifier.scopusauthoridBurrow, ME=7005876730en_US
dc.identifier.scopusauthoridTagami, J=7005967527en_US
dc.identifier.scopusauthoridPashley, DH=35448600800en_US

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