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Because an operator has only about one chance out of three to place a composite increment within this clinically acceptable range, clinicians are advised to use an instrument (e.g., a periodontal probe with a 2-mm mark) to estimate the thickness of each increment of composite they place. Objective To measure and compare the effect of operator experience in their ability to place composite in increments that are 2 mm thick.Methods and Materials Fifteen volunteers from each class of freshmen, sophomores, juniors, and senior dental students