[Prototype of an instrument for retrograde obturation].

Several instruments to carry and put the silver amalgam into de apical foramen for it's posterior condensation without spreading this material over the periodontal tissues, bone and adyacent mucosa, has been designed along the years. This article describes an easier and cheaper way to make an endodontic amalgam carrier by the adaptation between en 18 and 22 mm intravenous catheters into disposable syringes by the use of autopolymerizable acrilic, given the dentist the option of making a very easy instrument, at a low cost which can be used as a commercial endodontic amalgam carrier as well.