What is the term for a positive reproduction of the dental arches or teeth in plaster or similar materials?

The term that refers to a positive reproduction of the dental arches or teeth in plaster or similar materials is a cast. A cast is created from an impression, which is a negative imprint of the teeth or dental arches taken in a material that can capture details, such as alginate or rubber. Once the impression is made, it is filled with plaster or another material that hardens to create a precise positive replica of the dental structures.

This process is crucial in dentistry for various applications, such as creating crowns, bridges, dentures, and orthodontic appliances. The terms “model” and “replica” can sometimes be used interchangeably with “cast,” but in the context of dental terminology, “cast” specifically refers to the hardened reproduction made from an impression. A model usually refers to the end product that might be used for demonstration or further construction, while a replica often implies exact copies of already made items.

Therefore, focusing on the precise nature of dental terminology, the correct answer for this question is the term cast, as it accurately defines the positive reproduction process in the context of dental work.