Model trimmers are grinding-wheel machines used to shape and standardize gypsum study and working models after they are poured and set, establishing consistent base angles, heights, and margins for articulation, storage, and scanning. A wet grinding wheel with water spray controls dust and heat while trimming the model to the desired form, often following standardized guides for orthodontic or prosthodontic models. Accurately trimmed models support reliable articulator mounting and consistent digitization when models are subsequently scanned for CAD/CAM design, making trimmers a routine part of model preparation.