Which gypsum product is commonly used to make diagnostic models?

The most suitable gypsum product for making diagnostic models is plaster. Plaster, also known as plaster of Paris, is widely used in dentistry for creating preliminary models due to its cost-effectiveness, ease of manipulation, and acceptable surface detail for basic applications. Its lower strength and porosity make it ideal for diagnostic purposes, where precision isn't as critical as in more advanced processes.

In contrast, dental stone and high-strength stone offer greater detail and strength, which are more suitable for working casts that require more durability and accuracy for procedures like fabricating crowns or dentures. Impression plaster is specifically formulated for taking impressions and does not serve the same purpose as a model material. Therefore, when the primary goal is to produce diagnostic models, plaster is the preferred choice due to its unique characteristics that align well with this specific application in dentistry.