Abstract
Accurate irreversible hydrocolloid impressions are difficult to obtain in patients undergoing fixed orthodontic treatment. Although various studies have validated the use of irreversible hydrocolloid material for routine impression-making, the undercuts created by the fixed appliances trap the impression material, resulting in deformation1 or dislodgement of the impression from the tray and sometimes even debonding of the brackets.2 Materials including beading wax, masking tape,3 and silicone putty4 have been proposed for covering the brackets and archwires to increase the accuracy of impressions.
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