HOSA Dental Terminology Practice

Which kind of bur is designed to assist in the preparation of the walls of a cavity?

1. Straight fissure burs

2. Taper fissure burs

3. Finishing burs

4. Round burs

The correct answer is: Taper fissure burs

Taper fissure burs are specifically designed to assist in the preparation of the walls of a cavity due to their unique shape and angle. These burs have a tapered design that allows for the creation of a smoother, more angled cavity preparation. This tapered shape is crucial because it helps in creating retention forms for the restorative material while also allowing for better access and visibility during the procedure. The tapered edges facilitate the shaping of the cavity walls, ensuring that they are properly contoured to support the restorative material being used. This aspect is particularly important when preparing cavities for fillings, as it enhances the stability of the restoration and helps to prevent future failure. In contrast, the other types of burs serve different purposes. Straight fissure burs are primarily used for cutting and shaping flat surfaces and do not provide the angling necessary for cavity walls. Finishing burs are designed for smoothing and polishing surfaces rather than initial cavity preparation. Round burs, while useful for accessing and removing decay, do not create the specific wall angle needed for effective cavity preparation.