The type of gypsum product used because of its hardness and wear resistance for waxing patterns to make crowns and bridges is?

The type of gypsum product used for waxing patterns to make crowns and bridges is known as dental stone or type IV gypsum. It is characterized by its high strength, low expansion, and Excellent wear resistance, making it ideal for creating precise and durable patterns. This product ensures that the wax patterns maintain their shape and detail during the casting process.