For what purpose is a chemical adhesive typically used in bonding?

A chemical adhesive is commonly utilized in bonding for both direct and indirect applications. In dentistry, chemical adhesives are versatile in their use; they can securely bond orthodontic appliances directly to teeth or indirectly by bonding restorative materials and prosthetics. This capability stems from the adhesive's ability to penetrate the tooth structure and create a strong bond with various dental materials, enhancing retention and stability regardless of whether the treatment is direct, such as with brackets, or indirect, like with crowns and bridges.

The other options are limited in their scope. For instance, stating that chemical adhesives are only used for temporary fittings overlooks their broader application in securing more permanent restorations. Similarly, mentioning dual curing confines the utility of the adhesive to specific curing techniques, which does not account for the full range of scenarios where chemical adhesives may be effectively applied. Lastly, restricting the use of chemical adhesives solely to ceramic materials neglects their compatibility and effectiveness with other materials commonly found in dental applications. Thus, the correct answer reflects the comprehensive nature of chemical adhesive use in both direct and indirect bonding processes.