What benefit does fluoride in glass ionomer cement provide?

Fluoride in glass ionomer cement is beneficial primarily because it helps prevent decay under the bands. The incorporation of fluoride ions in the cement contributes to the remineralization of enamel and can inhibit the demineralization process that leads to caries. This is especially important in dental applications where moisture control may be limited, such as in the placement of orthodontic bands, ensuring that the underlying tooth structure remains protected from decay.

The other options do not accurately capture the primary benefit of fluoride in this context. For instance, while the strength of the bonding material is important, fluoride's role is more about caries prevention than enhancing bond strength directly. Aesthetic appearance does not significantly improve due to fluoride, as glass ionomer cement’s main function revolves around its protective qualities rather than aesthetics. Lastly, fluoride does not have a direct effect on the ease of removal of the bands; instead, it focuses on safeguarding the tooth from potential decay. Thus, the primary advantage of using fluoride in this scenario is its decay-prevention capability.