Hydrolytic stability of methacrylamide in acidic aqueous solution

Nishiyama, Norihiro; Suzuki, Kazuomi; Yoshida, Hajime; Teshima, Hideki; Nemoto, Kimiya

doi:10.1016/s0142-9612(03)00616-1

Cited by 94 publications

(86 citation statements)

References 7 publications

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“…3 Since self-etch adhesives contain acidic functional monomers, methacrylate comonomers and water, acidified water can attack the ester bonds in monomers under acidic conditions. [4][5] Hydrolysis of the ingredients in the adhesive leads to a change in concentration of the components over the period of storage in a dental office. The reason for not achieving optimal bonding performance might be due to poor clinical procedures or a poor shelf life of the singlestep self-etch adhesives.…”

Section: Introductionmentioning

confidence: 99%

Influence of Storage Conditions of Adhesive Vials on Dentin Bond Strength

Shibuya-Chiba

Iwasa

Tsubota

et al. 2010

Operative Dentistry

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SUMMARYThis study was carried out to examine the effect of storage conditions of adhesive vials on the dentin bond strength of single-step self-etch adhesive systems. The adhesive/resin composite combinations used were: Absolute 2/Ceram·X(AB), Adper Prompt L-Pop/Filtek Supreme(AP), Bond Force/Estelite Σ Σ Quick(BF), Clearfil tri-S Bond/Clearfil AP-X(CT) and GBond/Gradia Direct(GB). Vials of adhesives were stored at 5°C, 23°C or 40°C. Specimens for the dentin bond strength tests were made after 0, 1, 2, 3, 4, 5 and 6 months. Labial bovine mandibular incisor dentin was wet ground with #600 SiC. The adhesives were applied according to the manufacturer's instructions. After adhesive light irradiation, resin composite cylinders were created (4 mm x 2 mm) and polymerized (n=10). Samples were stored in 37°C distilled water for 24 hours, then shear tested at a crosshead speed of 1.0 mm/minute. ANOVA and Dunnet tests were performed at a significance level of 0.05. Scanning electron microscopic (SEM) observations of the dentin surfaces were made. Bond strengths varied, with storage conditions ranging from 2.2 ± 1.4 to 9.3 ± 2.4 MPa for AB, 4.5 ± 1.5 to 13.3 ± 2.7 MPa for AP, 5.1 ± 1.9 to 5.1 ± 1.9 MPa for BF, 7.7 ± 1.9 to 19.7 ± 2.0 MPa for CT and 7.4 ± 1.3 to 15.7 ± Clinical RelevanceShort-term storage at low temperatures enhances the dentin bond strength of single-step selfetch adhesives. Laboratory Research

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Section: Introductionmentioning

confidence: 99%

Influence of Storage Conditions of Adhesive Vials on Dentin Bond Strength

Shibuya-Chiba

Iwasa

Tsubota

et al. 2010

Operative Dentistry

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“…Some of the drawbacks include: HEMA retains water within the adhesive layer and adversely Received Nov 6, 2008: Accepted Mar 13, 2009 affects the mechanical strength 13) ; 70% of HEMA can be hydrolyzed in acidic solutions within a week at 37°C 14) ; HEMA provides low photopolymerization reactivity. Moreover, HEMA causes sensitized delayed allergic reactions 15) .…”

Section: Introductionmentioning

confidence: 99%

Design of a new self-etching HEMA-free adhesive

2009

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The effect of the pH value of single-bottle, self-etching 2-hydroxyethyl methacrylate (HEMA)-free adhesives on their shelf lives with bonding ability was investigated. Two experimental adhesives [SA-1 (pH=3.0); SA-2 (pH=2.1)] comprising 6-methacryloyloxyhexyl phosphonoacetate (6-MHPA), 4-acryloyloxyethyltrimellitic acid (4-AET), Bis-GMA, water, and acetone, in which the pH values were controlled with 1N NaOH, were stored for 6 weeks at 50°C in air. Shear bond strengths of aged adhesives to ground and unetched enamel and dentin were measured at a crosshead speed of 1.0 mm/min, and the data were analyzed by ANOVA. The resin-tooth bonding interfaces were further observed with SEM. With SA-1, the bond strengths to the tooth substrates were maintained throughout the 6 weeks. However, with SA-2, bond strength significantly degraded from weeks 4 to 6 (p<0.05). Based on SEM observation, non-aged and 6-week-aged adhesive SA-1 appeared to be strongly adhered to both enamel and dentin. It was found that the stability of the self-etching adhesive was influenced by its pH value.

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“…39,40 This may, in clinical function, have brought about the failures seen. The phosphonated ester is less stable than other chemicals present in other bonding systems as a consequence of its greater chemical reactivity.…”

Section: Discussionmentioning

confidence: 99%