Effect of silver diammine fluoride application on dentin bonding performance

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Adhesive Dentistry

Background:

• Silver diamine fluoride (SDF) is increasingly used for caries management.
• Its effect on the durability of dentin bonding is not fully understood.
• Understanding SDF's impact is crucial for restorative procedures.

Purpose of the Study:

• To evaluate the influence of two different silver diamine fluoride (SDF) concentrations on dentin bonding.
• To assess the effect of thermocycling on the bond strength and interfacial integrity.
• To determine the optimal SDF concentration for preserving dentin bond performance.

Main Methods:

• Human dentin samples were treated with distilled water (control), 3.8% SDF, or 38% SDF.
• A two-step self-etch adhesive and resin composite were applied.
• Microtensile bond strength (µTBS) and interfacial morphology were assessed after 0, 5,000, and 10,000 thermocycles (TC).

Main Results:

• Both 3.8% and 38% SDF significantly reduced µTBS at 0 TC.
• At 5,000 and 10,000 TC, 3.8% SDF showed comparable µTBS to the control, while 38% SDF showed significantly lower µTBS.
• Acid-base resistance zones formed in all groups, with slope-shaped formations unique to SDF groups.

Conclusions:

• Higher SDF concentration (38%) negatively impacts dentin bond strength durability.
• Lower SDF concentration (3.8%) may be compatible with self-etch bonding systems after aging.
• SDF concentration and thermocycling significantly influence dentin bonding performance and interfacial morphology.