Which instrument is primarily used for trimming bone?

The instrument primarily used for trimming bone is the rongeurs. This tool is specifically designed for cutting and removing bone during surgical procedures. Rongeurs have a clamping mechanism with sharp, scooped tips that provide a powerful and controlled way to trim bone tissue. This capability is essential in procedures such as orthopedic surgeries and tooth extractions where precise manipulation of bone is necessary for effective outcomes.

Other instruments listed serve different purposes. The bonefile is utilized to smooth rough edges of bone rather than for trimming. Sutures are used for stitching tissues together post-surgery and have no role in bone manipulation. A scaler is primarily employed in dentistry to remove calculus from teeth and is not designed for handling bone. Therefore, the rongeurs are uniquely suited for the task of trimming bone, making them the correct choice in this context.