Dentists impression tray set specifies tray width and length radios for four and six trays per jaw for increasing impression mass trough area

摘要

The tray set offers increasing mass trough area with maximum length (Y) and width (X) and a trough width taken at the apex on the inside of the trough. One tray of the set has a trough width (Xn+1) smaller than the width (Xn) of tray (n). The index (L1) is allocated to the tray with smallest length (Y1). In the specified tray set (X2n) exceeding (X2n+1) is valid for (Yn+1) greater than (Yn) with (n) = 0,1,2... The trays in the set differ in trough width maximally by 15 % and the set includes six or four trays per jaw in which case tray (L3) meets condition (X3) to be less than (X2) with (Y3) greater than (Y2).