Retention device for CT positioning projection of upper and lower jaws of oral maxillofacial region

The utility model discloses a retention device for CT (Computed Tomography) positioning projection of upper and lower jaws of an oral maxillofacial region. The nursing bed comprises a bed board, fixedseats are arranged on the left and right sides of the upper part of the bed plate and are fixedly connected with the bed plate through bolts; a mounting groove is formed in the fixed seat, and a rackis arranged in the mounting groove; the rack is in sliding connection with the mounting groove; a gear is arranged on the right side of the rack, the gear is meshed with the rack through teeth, an adjusting knob is arranged outside the fixing base, the adjusting knob and the gear are welded and fixed, a telescopic rod is arranged on the upper portion of the rack, the telescopic rod and the rack are fixed through a bolt, and a movable shaft is arranged on the upper portion of the telescopic rod. The fixing base is arranged on the lower portion of the supporting plate, the rack is arranged in the fixing base to be used