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Bonding ability of experimental resin-based materials containing (ion-releasing)-microfillers applied on water-wet or ethanol-wet root canal dentine

Zavattini, A., Feitosa, V.P., Mannocci, F., Foschi, F., Babbar, A., Luzi, A., Ottria, L., Mangani, F., Casula, Ignazia and Sauro, S. 2014. Bonding ability of experimental resin-based materials containing (ion-releasing)-microfillers applied on water-wet or ethanol-wet root canal dentine. International Journal of Adhesion and Adhesives 54 , pp. 214-223. 10.1016/j.ijadhadh.2014.06.007

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The objective of this study was to evaluate the bonding performance of model resin-based adhesives doped with bioactive glass or calcium-silicate modified dicalcium-phosphatedihydrate microfillers to root canal wet-dentine with water or ethanol. The experimental resin was prepared by using urethane-dimethacrylate (UDMA), triethylene-glycol-dimethacrylate (TEGDMA) and hydroxyethyl-methacrylate (HEMA). This resin blend was mixed with 50 wt% ethanol to create the experimental primers. Bioactive glass 45S5 (BAG) or calcium-silicate modified dicalcium-phosphate dihydrate (DCPD) microfillers were mixed at 40 wt% to the blend. The bonding performance to root canal was assessed by push-out bond strength, SEM analysis of fractures, and interfacial confocal microscopy after filling the canals with the core composite Bis-Core (Bisco). Three-way ANOVA (bonding technique, adhesive resin and dentine area) and Student–Newman–Keuls post-hoc were used to statistically compare the results (α=5%). Filler-free adhesive applied on water-wet dentine showed lower bond strength than the same resin applied on ethanol-wet dentine (p<0.05). Only the former group showed predominantly adhesive fractures whereas all other treatments led mostly to mixed failures. The presence of both fillers did not influence the push-out bond strength using ethanol-wet approach (p>0.05) but did improve using the water-wet strategy. BAG and DCPD also promoted mineral deposition and tubular occlusion in the well-hybridised fractured root surfaces especially using the ethanol-wet technique. The confocal interfacial analysis showed impaired resin infiltration only using the filler-free resin on water-wet dentine. As a conclusion, bioactive glass and DCPD micro-fillers as well as the ethanol-wet bonding were able to improve the adhesion of etch-and-rinse adhesives to radicular dentine.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Dentistry
Publisher: Elsevier
ISSN: 0143-7496
Date of Acceptance: 29 January 2014
Last Modified: 21 Apr 2018 22:43

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