Bonding of GICs to Aged SDF-Treated Carious Dentin

Objectives: This study investigated the effect of surface conditioning on the shear bond strength (SBS) of high viscosity Glass-Ionomer Cements (GICs) to aged silver-diammine-fluoride (SDF) treated carious dentine.
Methods: Thirty-five freshly extracted human premolars were sectioned and demineralized to create artificial carious dentin. The demineralized dentin specimens were treated with 38% SDF (Riva Star) for 2 mins, washed, stored for 2 months in deionized distilled water at 37°C, and subjected to the following conditioning procedures (n=7): Group A – no surface treatment (control); Group B - 10 secs Polyacrylic Acid (PAA); Group C - 5 secs phosphoric acid (PPA); Group D - 5 secs PPA plus universal adhesive (Zipbond); Group E - 5 secs PPA plus resin-modified GIC adhesive (Riva bond LC). High viscosity GIC (Riva Self Cure HV) were placed in the metal jig to bond to the surface treated specimens and stored in artificial saliva at 37°C for 1 week. SBS was subsequently performed with a Universal Testing Machine (load of 500N and crosshead speed of 1mm/min). Statistical analysis was done with one-way ANOVA (α=0.05).
Results: Ranking of mean bond strengths were: Groups B (7.06±1.73 MPa) > A (6.47±3.22 MPa) > C (5.26±4.50 MPa) > E (3.68±1.88 MPa). No significant differences in SBS were observed (p=0.19). All specimens in Group D failed prematurely and bond strength could not be determined.
Conclusions: Surface treatment with polyacrylic acid produced the highest shear bond strength of high viscosity GIC to SDF treated carious dentin. This is the preferred method for Silver-Modified Atraumatic Restorative Treatment.