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The tray can then be placed in the child's mouth. Individuals who are new to compound may believe that it might be difficult to remove the compound impression from the teeth because of hard compound setting in the undercut areas. This is not a problem, and experience with the material will bear this out for individuals who use compound for the first time.
The compound material needs to be pliable, but not runny or it will take too long to set up. Ideally, the impression should be withdrawn after ten to fifteen seconds because children tolerate short impression times much better. A steady stream of air accelerates the set of the compound once it is inserted.
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