# Does the Use of Different Remineralisation Agents in a 14-day Demineralisation/Remineralisation Cycle Affect the Bond Strength to Artificial Carious Enamel Surfaces?

## TL;DR

This study examines how different remineralisation agents affect the bond strength of dental adhesives on artificial carious enamel.

## Contribution

The study evaluates the impact of various remineralisation agents on bond strength and fracture types in a 14-day pH-cycling model.

## Key findings

- Fluoride varnish and MI varnish showed significantly lower bond strength compared to the positive control.
- All tested agents promoted remineralisation in demineralised enamel areas.
- Non-varnish agents did not negatively affect bond strength to enamel surfaces.

## Abstract

To examine the effect of applying different forms of remineralising agents during a pH-cyclinge on the bond strength of a universal adhesive applied in the etch-and-rinse mode and the types of fractures that occur after shear bond-strength testing.

84 human molars were divided into seven equal groups. Groups 1 (intact enamel) and 2 (artificially demineralised enamel) served as the positive and negative controls, respectively. In the experimental groups (3-7), the enamel was treated using remineralising agents during a 14-day pH-cycling protocol. Group 3: fluoride gel; group 4: fluoride varnish; group 5: Tooth Mousse; group 6: MI Paste Plus; group 7: MI Varnish. Afterwards, the molars’ crowns were sectioned off, and a universal adhesive (G2-Bond Universal) was applied to the buccal surfaces of these samples using etch-and-rinse mode. Nanohybrid resin composite restorations (G-aenial Posterior) were then placed, and shear bond-strength testing was performed. The effects of remineralisation agents on artificial carious lesions were evaluated using scanning electron microscopy/energy-dispersive analysis.

The fluoride varnish and MI varnish groups show statistically significantly lower shear bond strengths compared to the positive control group (p<0.001). The bond strength to all remineralising agents was higher than that of the negative control group. All tested agents promoted remineralisation in demineralised areas of the enamel surface.

Remineralisation agents in forms other than varnish do not negatively affect the shear-bond strength to enamel surfaces.