What type of impression materials are commonly used for study models and special trays?

The use of alginate or elastomer impression materials for creating study models and special trays is based on their specific properties that make them ideal for capturing detailed impressions of the oral cavity. Alginate materials are particularly known for their ability to capture fine details, are easy to mix and manipulate, and set quickly. They are hydrophilic, meaning they perform well in moist environments, which is a significant advantage when taking impressions of the mouth.

Elastomeric materials, such as silicone or polyether, offer excellent dimensional stability and can capture even more precise details, making them suitable for both study models and the creation of custom trays. Their flexibility allows for easy removal from the mouth without distorting the impression, which is critical when producing accurate replicas and trays tailored to individual anatomical features.

In contrast, wax bite rims are primarily used to record occlusal relationships and are not suitable for comprehensive impressions needed for study models. Complete removable prostheses refer to the final dental appliances rather than the impression materials used to create study models. Articulating paper is utilized to check occlusion and bite but does not serve the function of capturing an impression of the oral structures. Therefore, alginate or elastomer impression materials are the most appropriate choice for the creation of study