Final answer:
The dental wax used for recording occlusal rims and for denture wax-ups in sheet form is called baseplate wax.
Step-by-step explanation:
The dental wax that is used for recording occlusal rims and for denture wax-ups, which is supplied in sheets, is called baseplate wax. Baseplate wax is a hard wax that softens at a higher temperature and retains its carved shape well, making it ideal for creating stable occlusal rims and shaping overall denture anatomy during wax-ups. Because of its properties, it is a critical material in prosthodontics for accurate registration of the patient's bite and the initial design of false teeth.