Therapeutic target of the present study is to introduce a new technique for adjusting Adams clasp, which is the most important component involved in the retention of removable appliances, to provide greater retention and patient comfort. In the present double-blind randomized clinical trial, 45 patients, in the 17‒25 age range will be randomly selected from those referring to the Department of Orthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences and the study will be performed at the time interval from 22-09-2014 to 19-02-2015. Four removable maxillary plaques will fabricate for each patient, which has two Adams clasps on first molars with hooks on both sides (in order to apply force on the plaque) on the middle portion of the palate along the mesial surfaces of first premolars with acrylic resin covering of the palate. One plaque will adjust from the area of both Adams clasps at overhead areas in the conventional technique. In the three remaining plaques, the Adams clasp will be bent by the Three-plong plier in the middle area of the bridge under three vertical angles of 8, 15 and 20 degrees .after placing the plate in the patients` oral cavity the degree of retention will be measured. For the blindness of the present study the plates will be randomly coded as A, B, C, and D.