What type of polishing agent is commonly used during coronal polishing?

The choice of a fine abrasive paste, typically made of aluminum oxide or pumice, as the common polishing agent during coronal polishing is based on the need for effective stain removal and smoothening of the enamel surface without causing damage. Fine abrasives are specifically designed to polish teeth by capturing and removing surface stains without being overly abrasive, which could harm the tooth enamel or dentin.

Aluminum oxide and pumice have proven to be effective materials that provide a balance between stain removal and maintaining the integrity of the tooth's surface. The particles in these polishing agents are small enough to polish effectively while minimizing the risk of abrasion, making them ideal for clinical use in a dental setting.

Other options like coarse files or drills are not appropriate for coronal polishing, as they are intended for more aggressive procedures involving tooth structure removal. Liquid toothpastes are generally not abrasive enough for the polishing process performed in dental settings, and fluoride gels, while beneficial for remineralization, serve a different purpose than coronal polishing. Thus, using a fine abrasive paste maximizes the effectiveness of polishing while safeguarding the health of the patient’s teeth.