Final answer:
Custom impression trays can be constructed from resin and made from a preliminary model. They can be full-arch or partial trays, depending on the specific dental needs. Adhesive is not required if the trays have a smooth surface.
Step-by-step explanation:
When it comes to custom impression trays, there are several statements that can be considered correct. One correct statement is that they can be constructed from resin, which is a commonly used material in dentistry. Another correct statement is that they are made from a preliminary model after the dentist has prepared the teeth. Lastly, it is incorrect to say that they are available only as full-arch trays, as they can also be made as partial trays to accommodate specific teeth or areas of the mouth.
For example, when a patient needs a crown on a single tooth, a custom impression tray can be made specifically for that tooth. It allows for a more precise and accurate impression-taking process. Additionally, the trays need to have a smooth surface to allow easy removal from the mouth, so they do not require adhesive.
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