Effects of silver diammine fluoride on microtensile bond strength of GIC to dentine

Abstract

ObjectivesThe objective of this study was to investigate the effect on the microtensile bond strength of a glass-ionomer cement (GIC), which is used for Atraumatic Restorative Treatment (ART), to normal and artificial carious dentine surface that had been treated with silver diammine fluoride (SDF) and without treatment. MethodsTwenty-four recently extracted human molars were sectioned by a low-speed blade to expose the dentine surface. These surfaces were treated by one of the four following procedures: a) immersing in artificial demineralized solution for three days; b) demineralization, followed by application of SDF drops, then washing off the precipitate and air drying; c) demineralization, followed by application of SDF drops, light-cured for 60s, then washing off and air drying; d) DI water storage for three days; e) DI water storage, followed by application of SDF drops, then washing off the precipitate and air drying; and f) DI water storage, followed by application of SDF drops, light-cured for 60s, then washing off and air drying. Then, GIC (Fuji IX, GC) was bonded onto samples and stored in the DI water for 24h and 7 days respectively. All the samples were sectioned perpendicularly into sticks with cross-sectioned area of ~1mm2. The microtensile bond strength was evaluated. SEM/EDX was performed at the interface. ResultsGenerally, the SDF or SDF light-cured pretreatments have no significant influence on the bond strength between GIC and dentine. Among the 24h carious dentine groups, the SDF light-cured had the significant highest bond strength value, compared with that of no treatment and SDF treated only. The bond strength value after 7 days DI water storage is significantly higher than that of 24h DI water storage. The artificial carious dentine had a significantly higher bond strength value, compared to that of normal dentine. ConclusionThe application of SDF on sound or deminearlized dentin prior to GIC application does not influence the mature bond strength at the adhesive interface under the conditions tested.