Dental burs are used for various reasons during dental procedures. Which one of the following bur shapes is most likely to be used during an inlay preparation to ensure no undercuts are produced?

The tapered fissure bur is the most suitable choice for inlay preparations, particularly due to its design, which facilitates the creation of precise cavity preparations without undercuts. The tapered shape enables the dentist to access difficult areas and create a draft angle that allows for the proper seating of the inlay, promoting retention and minimizing the risk of trapping material or creating undercuts. This is crucial during restorative procedures, as undercuts can hinder the successful placement of an inlay, potentially leading to complications.

Inlay preparations require careful consideration of the cavity design to ensure the restoration fits correctly and is secure. The tapered fissure bur achieves this by allowing a straight wall preparation necessary for achieving a proper seal with the inlay material. Other bur shapes, while they have their own applications, may not provide the same benefits for inlay preparations. For instance, the flat fissure bur may create flat walls but lacks the taper required for effective retention of an inlay. The pear bur, while versatile, tends to create undercuts that may impede the fitting of the restoration, and the round bur is primarily used for initial access and removal of decay rather than for preparing inlays.