National Dental Assisting Examining Board (NDAEB) Practice Exam

How is the size of the wedge determined for use in dental procedures?

1. By the dentist's preference

2. By the size and shape of the cavity

3. By the size and shape of the embrasure

4. By the material used for the filling

The correct answer is: By the size and shape of the embrasure

The size of the wedge used in dental procedures is primarily determined by the size and shape of the embrasure. The embrasure refers to the space between adjacent teeth, which is crucial for ensuring that the wedge fits properly and provides adequate support during restorative procedures. A well-fitting wedge helps to create a tight seal at the margins of the restoration, preventing the leakage of materials and ensuring the longevity and success of the filling. If the wedge does not fit well within the embrasure, it may not adequately adapt the matrix band to the tooth surface, which can lead to improper contouring and potential gaps or open margins in the restoration. Considering other options, while the dentist's preference can influence certain aspects of dental procedures, it is not the primary factor in determining wedge size. Similarly, the size and shape of the cavity itself may influence the choice of restoration but are not directly related to the selection of the wedge size. Finally, the material used for the filling could affect other aspects of the procedure but does not dictate the specific wedge size needed for the dental restoration.