Which gypsum material is used to form dental models?

The correct choice, stone, is specifically formulated as a type of gypsum material that is widely used in dentistry for creating dental models. Stone, which has a finer particle size and higher density than plaster, provides excellent detail and durability, making it ideal for producing precise replicas of dental impressions. This material ensures that the resulting models accurately reflect the patient's oral anatomy, which is crucial for planning treatments, creating prosthetics, or orthodontic applications.

Plaster, while also a gypsum product, has a coarser texture and is typically used for applications that do not require the same level of detail or strength, such as preliminary models or educational purposes. Concrete is not used for dental purposes but rather for construction due to its strength and different properties. Although gypsum is a broader category that includes both plaster and stone, it is important to specify the type of gypsum material that is optimal for dental models, which is why stone is the most appropriate choice.