Upper and lower tray apparatus for manufacturing dentures

An upper and lower tray apparatus for manufacturing a denture, comprising:

• upper main trays and lower main trays fitted on upper and lower gums in a mouth of a patient;
• upper and lower auxiliary trays coupled to or separated from occluding portions of the upper main tray and the lower main tray;
• and a tray adjustment unit disposed between the upper main tray and the lower main tray and adjusting horizontality and height of the upper and lower main trays to fit the patient so that the gums are comfortable around a condyle in the mouth of the patient,
• wherein the upper and lower main trays each have a fitting hole having a stepped side formed along an inner edge at a horizontal surface of a body so that the upper and lower auxiliary trays are fitted therein, the tray adjustment unit includes:
• a fixing plate fixed at a center of a bottom of the upper main tray in close contact with left and right sides:
• a nut having a threaded hole at a predetermined depth at a lower center and integrally protruding downward at a center of a bottom of the fixing plate;
• a bolt having a threaded surface to adjust height by being in inserted in the threaded hole from under the nut, and having a fitting protrusion at a center of a bottom;
• a left-right sliding block having a fitting groove at a center of a top to be coupled to the fitting protrusion of the bolt and having a rail groove on a bottom;
• and a rail plate having a rail formed on a top to be fitted in the rail groove of the block and guiding the block sliding left and right, and fixed at a center of a top of the lower main tray in close contact with left and right sides by resin.