3Ī unique feature of the ProTaper files, compared to other file systems, is each instrument has changing percentage tapers over the length of its cutting blades. To address this perception, the ProTaper system (Dentsply Tulsa Dental Specialties) was developed to both duplicate and simplify the Schilder technique. However, the method Schilder described frequently required many instruments, several recapitulations through a series of files and reamers, and as such, is perceived to be difficult and time-consuming. Over many years, the pre-enlargement technique has grown in popularity, as this method for shaping canals has proven to be predictably successful. Schilder’s shaping objectives are the standard against which all other preparation techniques are measured. Following pre-enlargement procedures, files were completely loose within the body of the canal and could be more predictably directed apically. Especially in longer, smaller diameter, and more curved canals, the tips of these 0.02 tapered instruments were typically loose within the coronal two-thirds of the canal, whereas the larger, stronger, and more active portion of each instrument would desirably engage and cut dentin. ![]() Schilder also emphasized the sequence of preparation where he removed restrictive dentin from the coronal two-thirds of the canal before initiating procedures in the typically more complicated apical region of the canal. Schilder described his Envelope of Motion technique, where a series of precurved reamers were selected, utilized from the smaller to bigger sizes, and rotated so they would randomly cut dentin on the withdrawal stroke. Schilder’s genius was how he used a series of instruments to carve the shape and sequence the preparation. Schilderian endodontics continues to serve as a powerful beacon of light to guide any clinician on the journey toward greater clinical confidence and success. 1–2 Complete endodontics promotes the retention of critically essential teeth and is the cornerstone of restorative and reconstructive dentistry. Fortuitously, Dr Herbert Schilder described the most predictably successful concepts for shaping canals, cleaning in three dimensions, and filling root canal systems. In the final analysis, although science and basic research can illuminate our clinical endeavors, ultimately, it is by our clinical actions that our success as a healing profession is measured. There is confusion trying to identify and integrate the best technologies and instruments. ![]() ![]() There is no consensus regarding deep shape, or what is the appropriate percentage taper of a canal that ensures a root canal system can be both three-dimensionally cleaned and filled. There is vigorous debate related to the question of how large to prepare the apical foramen. There is ongoing controversy regarding the sequence of canal preparation, working length, and the use of patency files. A review of the literature reveals virtually no agreement on a variety of fundamental clinical issues. There are enormous differences in opinion regarding the best methods for shaping root canals.
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