What type of equipment is commonly used during coronal polishing?

The correct answer highlights the essential equipment utilized during coronal polishing, which is a procedure aimed at removing plaque and stains from the tooth surface. A slow-speed handpiece is specifically designed for this task, as it allows for controlled application of polishing materials without overheating the tooth or causing discomfort to the patient.

The polishing cup or brush, attached to the slow-speed handpiece, is crucial for achieving an effective polish. These attachments are designed to hold prophylactic paste, a special abrasive paste intended for use in this procedure to enhance the cleaning and polishing of the enamel. The combination of this handpiece, the polishing cup or brush, and prophylactic paste ensures that coronal polishing is performed safely and effectively, promoting optimal dental hygiene and aesthetics.

Other options refer to equipment used for different dental procedures that are not relevant for coronal polishing. For example, high-speed handpieces are employed for restorations rather than polishing. Dental trays with whitening gel are associated with teeth whitening procedures, and dental scalers focus on the removal of calculus, which is distinct from coronal polishing. Fluoride varnish application is a preventive treatment aimed at protecting teeth rather than polishing them, further distinguishing it from the key equipment necessary for coronal polishing.