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ePaper created 2018-05-16, 11:45:19 | version 1.38.0
Fig. 1a Fig. 1b Fig. 2 Fig. 3 Fig. 4 Fig. 1a This axial view of a mandi- bular molar demonstrates the ovoid eccentricity of the canals and existence of an isthmus connection between the mesiobuccal and mesiolingual canals consistent with findings of numerous studies.8, 9 Fig. 1b The root canal space is an arborizational, anastomo tic, labyrinthine complexity, morphologically comparable to the pathways of a maze. While primary canals exist, the tributaries, accessory branches and lumina of the dentinal tubules harbor extensive tissue and microflora. The existence of these vast, capacious passages has been demon- strated throughout the past century, beginning with the work of Hess and continues to this day with the use of microcomputed tomogra- phy. 17 Fig. 2 The axial view of the obtu- ration (microstructural replication) demonstrates the flaw in flat field film interpretation. Significant areas of the buccolin- gual dimensions of the root canal space remained uncleaned despite the illusory appearance in the radiograph. Fig. 3 Dr. Herbert B. Schilder’s principles included a contin- uously tapering shape, maintenance of the original anatomy, an apex as small as practical, and conservation of tooth structure. A continuously tapering space was acquired using precurved hand instru- ments, which imposed discontinuous contact with the canal walls and created an envelope of motion. Transactionally, Schilder created a virtual core. Fig. 4 The ideal file would produce an apical size that three-di- mensionally cleaned the minor apical foramen. The SAF is a hollow file designed as an elastically compress- ible, thin-walled pointed cylinder that is composed of a NiTi lattice. Its hollow shape allows for the continuous flow of irrigant through its lumen. It was a beginning in the paradigm shift toward minimally invasive 3-D debridement and disinfection. Article Endodontics issue 2018 — 35