For which purpose is an angle former primarily used?

An angle former is primarily used in dentistry to establish a clearer line and angle in cavity preparation. This instrument plays a crucial role in shaping the cavity to ensure that the margins of dental restorations are well-defined, which aids in creating an optimal fit for restorative materials. The design of the angle former allows for precise control when forming internal angles and shaping cavity walls, which enhances the overall effectiveness of the restorative work. This contributes significantly to the longevity and success of dental restorations by ensuring that they adhere properly and fit snugly against the tooth structure.

Other options represent functions that are not the primary purpose of an angle former. For instance, the removal of carious dentin involves different instruments specifically designed for excavation, such as hand excavators or rotary instruments. Injecting anesthetic is typically done with a syringe and needle rather than with an angle former, and beveling retention areas is usually achieved using other types of burs or dental handpieces designed for that specific purpose. Thus, while each treatment has its tools, the angle former is distinctly recognized for its role in defining angles and lines during cavity preparations.