Abstract: An improved manual pressure syringe for odontological use, includes a handgrip provided with a control lever, a barrel for a cartridge, and a bushing arranged on the longitudinal extension of the barrel. It also includes a shaft having a pushbutton at one end which is slidable in the bushing and acts on the piston of the cartridge, a thrust lever for the shaft operated by the control lever, and a coil spring arranged between the thrust lever and the bushing. The coil spring is formed of two end parts, the turns of which are of a larger diameter than that of the shaft, and an intermediate part, the turns of which are substantially of the same diameter as that of the shaft.