Which tool is used primarily for bone shaping and contouring?

The rongeurs are specifically designed for bone shaping and contouring. They feature a pair of sharp-edged, scissor-like blades that can cut and remove bone with precision. The design allows for controlled removal of bone tissue, making them essential instruments in surgical procedures, especially in oral and maxillofacial surgery. Their ability to grasp and trim bone while providing the operator with excellent visibility is crucial in many dental surgical contexts, which emphasizes their role in bone manipulation.

Other tools listed, while important in various dental procedures, do not serve primarily for bone shaping. Chisels are used for cutting hard tissues and enamel but are not primarily designed for contouring bone. The bone file is utilized mainly for smoothing rough surfaces of bone rather than shaping it. Scalers are instruments for removing calculus and plaque from teeth, which does not involve shaping or contouring bone. Thus, the rongeurs stand out as the correct tool for bone shaping and contouring.