What are the three classifications of impressions used in dentistry?

The classifications of impressions used in dentistry are indeed categorized into preliminary, final, and occlusal. Preliminary impressions are the first step, often used for diagnostic purposes and to create study models. They provide a general shape and size of the dental arches and surrounding tissues. Final impressions, on the other hand, are more precise and are used to create definitive models for prosthetics, crowns, or dentures. They capture detailed anatomical features of the oral cavity, ensuring a proper fit for the restoration or appliance being made. Occlusal impressions are specifically designed to capture the bite relationship between the upper and lower teeth, which is crucial for aligning restorations and ensuring proper function and comfort.

This classification is foundational in restorative dentistry and orthodontics, enabling dental professionals to plan effective treatment strategies based on accurate impressions of the patient’s dental anatomy. Understanding these types helps in delivering better patient care and enhances the accuracy of various dental procedures.