Which of the following rongeurs is used to expand the antrostomy in a Caldwell-Luc procedure?

The Kerrison rongeur is specifically designed for removing bone and for creating access in tight spaces, making it highly suitable for procedures involving the nasal cavity, such as the Caldwell-Luc procedure. This procedure requires the expansion of the antrostomy, which is the opening made to provide drainage from the maxillary sinus into the nasal cavity. The Kerrison rongeur features a curved or angled design that allows the surgeon to accurately and effectively grasp and excise bone, which is essential for widening the antrostomy. Its precision and controlled cutting capabilities make it ideal for this specific surgical task.

Other instruments mentioned have different primary uses. The Cushing rongeur, typically used in neurosurgery, specializes in soft tissue and is not suited for bone expansion in the context of sinus procedures. The Bethune rongeur is used mainly for removing small pieces of bone, particularly in orthopedic surgeries, which does not align with the needs of the Caldwell-Luc procedure. The Stille-Luer rongeur, although it has applications in various surgical fields, does not provide the specific design benefits needed for expanding the antrostomy effectively. Thus, the choice of the Kerrison rongeur is appropriate for its specific anatomical and procedural requirements in this context.