What is the primary instrument used for indirect vision in dental procedures?

The primary instrument used for indirect vision in dental procedures is the mouth mirror. This instrument allows dental professionals to visualize areas of the oral cavity that are difficult to see directly, such as the posterior teeth or the maxillary arch. The reflective surface of the mirror enables the practitioner to view these areas without the need to reposition the patient's head or tilt their line of sight excessively.

Additionally, the mouth mirror can also be used to provide retraction of the tongue and cheeks, which further improves the dentist's ability to perform various procedures efficiently and effectively. By enhancing visibility, the mouth mirror plays a crucial role in ensuring accurate diagnosis and treatment planning in dentistry.

The other instruments listed have different functions: the explorer tool is primarily used for examining the surfaces of teeth for caries or abnormalities, cotton pliers are designed for handling cotton rolls and other small items, and a scalpel is used for incisions in soft tissue. Each of these instruments serves a specific purpose, but none are suited for indirect vision in the same way that a mouth mirror is.