The transition  to the  use of  gutta­ percha as the preferred endodontic filling material and the increased use of condensation methods (lateral and vertical) have resulted in definitive changes in the design of the endodon ­ tic canal preparation. Gutta-percha is biologically acceptable and more per­ manent, but it is difficult to manipu­ late. This paper introduces a clinical method-anticurvature filing- for the preparation of the curved or narrow canal to receive gu tta-percha filling materials.