Influence of Storage Conditions of Adhesive Vials on Dentin Bond Strength

Abstract

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

Overview of Clinical Alternatives to Minimize the Degradation of the Resin-dentin Bonds

“…Based on this supposition, preheating of adhesive systems was recently investigated for ER and SE adhesive systems. [135][136][137][138] However, contrary to previous expectations, this approach did not improve the immediate or longterm resin-dentin BS produced by ER 137 and SE systems. 138 Probably, heating the adhesive may alter the stability of the acidic monomers in such way that it jeopardizes their bonding effectiveness.…”

“…[135][136][137][138] However, contrary to previous expectations, this approach did not improve the immediate or longterm resin-dentin BS produced by ER 137 and SE systems. 138 Probably, heating the adhesive may alter the stability of the acidic monomers in such way that it jeopardizes their bonding effectiveness. 135,136 An important issue that should be mentioned is the potential effect on pulp and dentinal fluid flow of high temperature produced by the use of warm airdrying, prolonged exposure times, or heated adhesive.The most widely accepted mechanism of dentin hypersensitivity is the hydrodynamic theory, 139 whereby fluid flow within dentinal tubules is altered (increased or changed directionally) by thermal, tactile, or chemical stimuli near the exposed tubule surfaces.…”

Efeito da clorexidina na resistência de união entre adesivo autocondicionante e dentina

“…Assim, os adesivos autocondicionantes possuem vidas úteis muito curtas e deve ser tomado especial cuidado nas condições de armazenamento dos frascos, pois é conhecido que altas temperaturas aceleram as reações, e as baixas as retardam. Assim, estes adesivos "all in one" são lançados ao mercado em apresentações de baixo volume, com datas de vencimento muito curtas, e é indispensável o armazenamento a temperaturas baixas (Aida et al, 2009;Ma et al, 2009;Shibuya-Chiba et al, 2010).…”