Final answer:
The instrument used to check the seal of a matrix band around a tooth is a matrix band holder. This tool helps ensure a tight seal and proper fit during dental procedures.
Step-by-step explanation:
The instrument used to check the seal of a matrix band around a tooth is called a matrix band holder. This tool helps to ensure that the band is securely in place and provides a tight seal around the tooth during dental procedures.
For example, a dental assistant or dentist may use a matrix band holder to stabilize the band while placing a dental filling. The holder helps prevent the band from coming loose or shifting during the filling process, ensuring a proper seal and fit.
The matrix band holder is an essential tool in restorative dentistry to achieve successful dental restorations.