What problem might arise when fabricating a provisional if undercuts are present on proximal surfaces?

When undercuts are present on the proximal surfaces during the fabrication of a provisional restoration, a problem that can arise is locking on. This occurs when the material used to create the provisional gets trapped in the undercut areas, making it difficult to remove the provisional once it has set. The undercuts create a physical barrier that prevents a smooth removal, leading to potential complications in the process, such as damage to the tooth structure or the provisional itself.

Understanding this situation is crucial for dental assistants because it directly affects the fitting and function of provisional crowns. A well-fabricated provisional should be easy to remove without compromising the underlying tooth structure or interfering with the final restoration. Being aware of the presence of undercuts allows for adjustments in technique or material selection to avoid locking on and ensure a more straightforward removal of the provisional.