alexa Improvement of the bond strength of 4-META MMA-TBB resin to collagen-depleted dentin.
General Science

General Science

Journal of Biotechnology & Biomaterials

Author(s): Soeno K, Suzuki S, Taira Y, Atsuta M

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Abstract It has been reported that the tensile bond strength between the 4-META/MMA-TBB resin and dentin pretreated with 10\% citric/3\% ferric chloride solution decreased after immersion in water for 2 years. The current study investigated the effect of an experimental dentin conditioner on the bonding of 4-META/MMA-TBB resin to dentin after thermocycling. The experimental conditioner was an aqueous solution of 10\% ascorbic acid and 5\% ferric chloride (Exp). Human teeth were prepared to expose flat dentin surfaces. These were treated sequentially with 40\% phosphoric acid, 10\% sodium hypochlorite, and the experimental conditioner. A commercially available dentin conditioner, an aqueous solution of 10\% citric/3\% ferric chloride (10-3) was used for a control group. Stainless steel rods were bonded to the pretreated dentin surfaces with the use of the 4-META/MMA-TBB resin. Tensile bond strengths were determined after 0, 5,000, 10,000, 20,000 themocycles. All data were analyzed by ANOVA, and differences among groups were analyzed by Duncan's new multiple range test (n = 10, p < 0.05). The experimental group showed no significant decrease in bond strength through 20,000 thermocycles, while the control group exhibited significant decrease after 10,000 thermocycles. Mean bond strength of the experimental groups were significantly higher than those of the control group at both 10,000 and 20,000 thermocycles. A hybrid layer could not be identified in SEM micrographs of the experimental groups. 10-3-conditioned specimen SEMs displayed crack formation between the adhesive resin and a hybrid layer. The experimental dentin pretreatment improved the bond strength of a 4-META/MMA-TBB resin to human dentin compared to 10-3 treatment after thermocycling. (c) 2004 Wiley Periodicals, Inc. This article was published in J Biomed Mater Res B Appl Biomater and referenced in Journal of Biotechnology & Biomaterials

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