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Conference Paper: Bonding strength on dentin from primary tooth withamelogenesis imperfecta

TitleBonding strength on dentin from primary tooth withamelogenesis imperfecta
Authors
Issue Date2007
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/IPD
Citation
International Journal of Paediatric Dentistry, 2007, v. 17 n. S1, p. 17 Abstract no.OS061 How to Cite?
AbstractObjective: Dentin of many teeth with amelogenesis imperfecta (AI)is histologically altered following loss of the overlying hypoplasticenamel and exposure to the oral environment. Such dentin becomeshypermineralized and sclerotic with obliteration of the dentinaltubules, which makes bonding less predictable. This studyexamined the effect of etching time on the microtensile bondstrength (MTBS) of an etch-and-rinse adhesive to dentin fromprimary tooth with AI.Methods: Flat coronal dentin surfaces from six primary molarsaffected by AI were divided into two groups according to theetching time (I) 15 seconds and (II) 30 seconds. Following etching,a two-step etch-and-rinse adhesive, Prime and Bond NT (DentsplyDe Trey) was applied to dentin surfaces, air-dried and light-cured.Composite build-ups were performed using Filtek Z250 (3MESPE) for MTBS testing. Flat dentin surfaces from six extracted,non-carious human primary molars were similarly bonded andwere used as controls. The bonded teeth were sectioned into beamsof 0.8 mm2and stressed to failure under tension at a crossheadspeed of 1 mm/min. Representative fractured beams from eachgroup were prepared for fractographic analysis under scanningelectron microscope (SEM).Results: One-way ANOVA and Tukey’s multiple comparison testsshowed that MTBS of dentin from primary tooth group with AIwas significantly low (15 seconds: 19.8 ± 6.6, 30 seconds: 21.1 ±7.7) compared to sound dentin groups (15 seconds: 31.8 ± 4.8,30 seconds 24.9 ± 5.1). SEM observation of the fractured surfacesrevealed predominantly adhesive failure for dentin in AI groups.The low MTBS observed in AI groups could be attributed to theporous hybrid layer and short resin tags that were retained on thecomposite side of the fractured beams.Conclusion: The bonding efficacy of etch-and-rinse adhesive wascompromised by dentin in AI groups and could not be improved byextending the etching time to 30 seconds.
Persistent Identifierhttp://hdl.handle.net/10722/94010
ISSN
2015 Impact Factor: 1.303
2015 SCImago Journal Rankings: 0.721

 

DC FieldValueLanguage
dc.contributor.authorHiraishi, Nen_HK
dc.contributor.authorYiu, CKYen_HK
dc.contributor.authorKing, NMen_HK
dc.date.accessioned2010-09-25T15:18:42Z-
dc.date.available2010-09-25T15:18:42Z-
dc.date.issued2007en_HK
dc.identifier.citationInternational Journal of Paediatric Dentistry, 2007, v. 17 n. S1, p. 17 Abstract no.OS061en_HK
dc.identifier.issn0960-7439en_HK
dc.identifier.urihttp://hdl.handle.net/10722/94010-
dc.description.abstractObjective: Dentin of many teeth with amelogenesis imperfecta (AI)is histologically altered following loss of the overlying hypoplasticenamel and exposure to the oral environment. Such dentin becomeshypermineralized and sclerotic with obliteration of the dentinaltubules, which makes bonding less predictable. This studyexamined the effect of etching time on the microtensile bondstrength (MTBS) of an etch-and-rinse adhesive to dentin fromprimary tooth with AI.Methods: Flat coronal dentin surfaces from six primary molarsaffected by AI were divided into two groups according to theetching time (I) 15 seconds and (II) 30 seconds. Following etching,a two-step etch-and-rinse adhesive, Prime and Bond NT (DentsplyDe Trey) was applied to dentin surfaces, air-dried and light-cured.Composite build-ups were performed using Filtek Z250 (3MESPE) for MTBS testing. Flat dentin surfaces from six extracted,non-carious human primary molars were similarly bonded andwere used as controls. The bonded teeth were sectioned into beamsof 0.8 mm2and stressed to failure under tension at a crossheadspeed of 1 mm/min. Representative fractured beams from eachgroup were prepared for fractographic analysis under scanningelectron microscope (SEM).Results: One-way ANOVA and Tukey’s multiple comparison testsshowed that MTBS of dentin from primary tooth group with AIwas significantly low (15 seconds: 19.8 ± 6.6, 30 seconds: 21.1 ±7.7) compared to sound dentin groups (15 seconds: 31.8 ± 4.8,30 seconds 24.9 ± 5.1). SEM observation of the fractured surfacesrevealed predominantly adhesive failure for dentin in AI groups.The low MTBS observed in AI groups could be attributed to theporous hybrid layer and short resin tags that were retained on thecomposite side of the fractured beams.Conclusion: The bonding efficacy of etch-and-rinse adhesive wascompromised by dentin in AI groups and could not be improved byextending the etching time to 30 seconds.-
dc.languageengen_HK
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/IPDen_HK
dc.relation.ispartofInternational Journal of Paediatric Dentistryen_HK
dc.rightsInternational Journal of Paediatric Dentistry. Copyright © Blackwell Publishing Ltd.en_HK
dc.titleBonding strength on dentin from primary tooth withamelogenesis imperfectaen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0960-7439&volume=17&spage=P.17&epage=&date=2007&atitle=Bonding+strength+on+dentin+from+primary+tooth+with+amelogenesis+imperfectaen_HK
dc.identifier.emailHiraishi, N: hiraishinoriko@yahoo.comen_HK
dc.identifier.emailYiu, CKY: ckyyiu@hkucc.hku.hken_HK
dc.identifier.emailKing, NM: profnigelking@mac.comen_HK
dc.identifier.authorityYiu, CKY=rp00018en_HK
dc.identifier.authorityKing, NM=rp00006en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-263X.2007.00836.x-
dc.identifier.hkuros128209en_HK
dc.identifier.volume17en_HK
dc.identifier.spage17en_HK

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