A new broach with barbs is visible (top). At present these instruments are available only with automated devices.įig. These instruments have circumferential grooves rather than single barbs and they hold up in use considerably better than the rasps. Recently, two instruments with a cutting surface somewhat similar to that of the rasp have been brought onto the market, namely the Rispi file and the Sonic Shaper ( Fig. The instrument is effective, but is not widely used today, since the barbs readily fall off during instrumentation and end up in the root canal. ![]() Cutting occurs by longitudinal movement of the rasp toward the canal wall. The rasps, or “rat tail files,” are used to instrument and enlarge the root canal. Rather, an instrument is used that cuts the pulp tissue at the desired apical level before it is removed. In modern endodontics this method is not recommended, as the pulp tissue is torn somewhere near the apical foramen, often impinging on the periodontal ligament as well. The pulp can then be removed, often in one piece. It is introduced into the pulp and rotated so that the barbs engage the tissue. The broach is used to extirpate the vital pulp. The depth, angle, and number of cuts (barbs) will determine how the instrument is used. ![]() They are made from round steel wire blanks and working edges are created by cutting into the wire at an angle to its long axis and then elevating the edges of the cuts. These instruments represent the oldest forms of root canal instruments ( Fig. Root Canal Instrumentation Hand Instrumentsīroaches and rasps. Root canal instruments are available as hand instruments and many of them as engine-driven instruments. Although almost all these instruments were designed between 50 and 100 years ago, important changes have occurred in recent years with regard to their quality, efficacy, and standardization. A variety of instruments are available for the extirpation of the pulp and the instrumentation, preparation, and obturation of the root canal.
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