Impression-material contraction specimen

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This artificial mouth duplicates the shape of a human with two remaining teeth, each tooth having been ground down by a dentist using cylindrical instruments. The ground-down teeth now require impressioning. To determine the contraction of impression materials, one must place the material into the tray, insert it into the body, and then secure the cover. Once the material has set, open the cover and carefully remove the impression material from the tray. Allow time to pass before measuring the material with a measuring stick; if the original distance between the teeth remains intact or if the impression material has changed in length, you can determine the extent of any difference. By examining this data, you can judge whether the impression material is suitable for storage. To simplify the measuring process, the tray used in these tests is not curved like a typical dental tray; instead, it is a flat surface that allows easy calculation of any differences. This design facilitates accurate measurements and makes it easier to evaluate the performance of various impression materials.