Final answer:
Modelling wax should be used during the restoration of a deep laceration due to its pliable consistency that allows for realistic texture and shape matching.
Step-by-step explanation:
During the restoration of a deep laceration, the type of wax that should be used is modelling wax. Modelling wax is preferable because it has a consistency that allows it to be shaped and textured to match the surrounding tissue, which is crucial for a realistic restoration. Other types of waxes, such as soft wax, may not hold their shape well, while hard wax could be difficult to manipulate and dental wax is specific to dental applications. Modelling waxes often have pliable characteristics that make them ideal for simulating flesh in a restoration context.