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A study was carried out of Class II, Division 1 cases treated by the Andresen appliance. Results were determined in terms of overjet reduction and the reasons for failure were recorded for those cases who did not complete their treatment. Growth and treatment changes were assessed cephalometrically. It was found that those cases showing the more complete overjet reduction also tended to show more growth in facial height and a faster rate of growth in facial height when compared with the less successfully treated cases.
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A. M. Cohen (1981) studied this question.
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