When placing a wooden wedge during the restoration of a class I restoration, which statement is incorrect?

The statement that a wooden wedge "always is inserted in the lingual embrasure" is incorrect. In dental practice, the placement of a wooden wedge is influenced by the specific clinical situation and the configuration of the restoration being performed.

While it is often advantageous to place the wedge in a position that supports the matrix band and helps to create a tight seal against the tooth structure, the positioning can vary. For instance, in certain restorations, especially those involving interproximal areas, the wedge might be placed in the buccal side or even adjusted based on the individual anatomy of the teeth. Thus, stating that the wooden wedge is always inserted in the lingual embrasure does not account for the variability of dental anatomy and technique modifications required in different situations.

The other statements are accurate in describing the function of a wooden wedge. For example, wedges indeed help minimize the risk of creating an overhang by aiding in the proper alignment of the materials used in the restoration. They also serve to separate the teeth slightly, which compensates for the space needed by the matrix band, ensuring that the filling material can be adequately shaped and contoured. Furthermore, a properly positioned wedge does extend slightly gingival to the gingival margin to effectively seal the margin