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Effect of waiting interval on chemical activation mode of dual-cure one-step self-etching adhesives on bonding to root canal dentin.
J Dent. 2012 Sep 18;
Authors: Thitthaweerat S, Nakajima M, Foxton RM, Tagami J
Abstract
OBJECTIVES: The purpose of this study was to evaluate the effect of waiting interval on the chemical activation of dual-cure one-step self-etching adhesives before placing resin core materials on the regional bond strength to root canal dentin. MATERIALS & METHODS: Forty-eight post spaces prepared in human lower premolars were applied with four dual-cure one-step self-etching adhesives (Estelite Core Quick: ECQ, Clearfil DC Bond: CDB, Unifil Bond: UNB and BeautiBond: BTB) as the manufacturers’ instructions. These adhesives were cured with light activation for 10 s, or chemical activation with 0, 10, and 30 s waiting intervals prior to placing resin core material. Resin core materials were then placed into the post space and light-cured for 60 s. After 24h water storage, each specimen was serially sliced into 8, 0.6×0.6mm thick beams for the μTBS test. The regional μTBS data were analyzed using three-way ANOVA and Dunnett’s T3 test (p<0.05). RESULTS: For the chemical activation with 10 and 30 s waiting intervals, ECQ and CDB exhibited significantly improved μTBS, whereas for UNB and BTB, the μTBS were not significantly different but increased with waiting interval. On the other hand, light-activation of all the adhesives produced significantly higher μTBS to root canal dentin than chemical activation (p<0.05), except for the UNB group. CONCLUSIONS: For the chemical activation of dual-cure one-step self-etching adhesives, a waiting interval prior to placing resin core material improved μTBS to root canal dentin. Polymerizing the adhesives before polymerization reaction of resin core material would be effective for bonding to root canal dentin. Clinical relevance: For chemical activation mode as well as light activation mode, pre-curing of adhesive layer before proceeding polymerization of resin filling material would produce higher bonding performance to dentin in the cavity.
[cite source='pubmed']23000471[/cite] – as supplied by publisher]