ProTaper geometries:
The Endodontic ProTaper files have a unique features, including:
- Changing percentage tapers over the length of its cutting blades.
- The progressively tapered design replicates the Schilderian Envelope of Motion technique and serves to significantly improve flexibility, cutting efficiency, and safety.
- They are convex, triangular cross-section, which enhances the cutting action while decreasing the rotational friction between the blade of the file and dentin.
- They have a changing helical angle and pitch over their cutting blades, which reduces the potential of an instrument from inadvertently screwing into the canal.
- The noncutting, modified guiding tip. This feature allows each instrument to safely follow the secured portion of a canal, while the small flat on its tip enhances its ability to find its way through soft tissue and debris.
- The ProTaper system is comprised of three Shaping and five Finishing files
Types Of Protaper Endodontic Files:
There are two types of files for the ProTaper Endodontic Files;
"The Shaping Files" and "The Finishing Files" ...
The Shaping Files:
- Shaping Files are Two: File No. 1 & File No. 2, Termed S1 & S2, Purple and White Respectively.
- The Auxiliary Shaping File, termed SX, has no identification ring on its gold-colored handle and, with a shorter overall length of 19 mm.
- The S1 and S2 files have D0 diameters of 0.17 mm and 0.20 mm, respectively, and their D14 maximal flute diameters approach 1.20 mm.
- SX File, provides excellent access when space is restrictive. The SX file has a D0 diameter of 0.19 mm and a D14 diameter approaching 1.20 mm.
- The Shaping files have increasingly larger percentage tapering, allowing each instrument to engage, cut, prepare and shape the canal, performing its own 'crown down' work.
- SX File has a much quicker rate of taper between D1 and D9 as compared to the other ProTaper "S files", it is primarily used after the S1 and S2 files to more fully shape canals in "coronally broken down" or "anatomically shorter" teeth.
The Finishing files:
- There are five "Finishing files" named F1, F2, F3, F4, and F5 have yellow, red, blue, double black, and double yellow colores corresponding to D0 diameters and apical tapers of 20/07, 25/08, 30/09, 40/06, and 50/05, respectively.
- From D4–D14 each instrument has a decreasing percentage taper which serves to improve flexibility, reduce the potential for dangerous taper-lock, and reduce the potential to needlessly overenlarge the coronal two-thirds.
ProTaper shaping technique:
- First, one should know that: The potential to consistently shape canals and clean root canal systems is significantly enhanced when the coronal two-thirds of the canal is first pre-enlarged, followed by preparing its apical one-third.
Scout the coronal two-thirds:
- "Hand files" sizes 10 and 15 are measured and precurved to match the anticipated full length and curvature of the root canal.
- The 10 and 15 hand files may be utilized within any portion of the canal until they are loose and a smooth reproducible glide path is confirmed.
- The loose depth of the 15 file is measured and this length transferred to the ProTaper S1 and S2 files.
Shape the coronal two-thirds:
- The secured portion of the canal can be optimally pre-enlarged by first utilizing S1, then S2. Prior to initiating shaping procedures,
- The pulp chamber is filled with a full strength solution of NaOCl.
- Without pressure, the ProTaper Shaping files are inserted into the canal and follow the glide path freely and easily.
- For more optimize safety and efficiency, the Shaping files are used, like a brush, creating lateral space, which will make the Shaping file’s larger, stronger, and of more active cutting blades.
- N.B: this brush-cutting action can be used to:
Eliminate cervically positioned triangles of dentin,
More effectively shape into fins, isthmuses, and canal irregularities, and
To relocate the coronal aspect of a canal away from furcal danger.
- N.B: If any ProTaper File ceases inside the secure Portion of the canal, then withdraw it and know that the debris blocked the intrablade spaces making the walls push the file away and decrease the cutting effeciency.
- N.B: Upon removing each Shaping file, visualize where the debris is located along its cutting blades to better appreciate the region within the canal that is being prepared.
- Following the use of each Shaping file, irrigate, recapitulate with a 10 file to break up debris, and move it into solution, then re-irrigate.
Scout the apical one-third:
- The apical one-third of the canal is fully negotiated and enlarged to at least a size 15 hand file, Working length confirmed, then the patency file is established.
- NOW, A decision must be made between whether to finish the apical one-third with rotary or hand instruments.
- If, a new size 15 hand file glide easily inside the canal without any interupption, this means that the canal if of normal shape and having no irrigularities and anatomical morphologies, then the Rotary ProTaper will be very good, easy and successfull.
- While If, a size 10 or 15 hand files must be precurved and necessitate a reciprocating handle motion, then the Manual ProTaper File is the best and most successful choice.
Shape the apical one-third:
- Vigorous irrigation with NaOCl is very important now, to remove the debris that may decrease the effect of the shaping files (discussed befor in "Shape the coronal two-thirds" section), to avoid blockage of canals and facilitate the shaping proccess.
- The ProTaper sequence is to carry the S1, then the S2, to the full working length.
- Float, follow, and brush (discussed befor in "Shape the coronal two-thirds" section) until the terminus of the canal (Apical Foramen) is reached.
- S1, then S2, will typically move to length in one or more passes depending on the length, diameter, and curvature of the canal.
- Following each ProTaper file, irrigate, recapitulate with a size 10 file, then re-irrigate.
- After using the Shaping files, particularly in more curved canals, working length should be reconfirmed, as a more direct path to the apical foramen has been established, leading to decrease working length.
- The preparation can be finished using one or more of the ProTaper Finishing files in a non-brushing manner.
- The F1 is selected and passively allowed to move deeper into the canal, in one or more passes, until the terminus is reached.
- Apical flutes are inspected, and if they are loaded with dentin, then visual evidence supports, the shape is cut.
- After using the F1 file, Irrigate with NaOCl, recapitulate, confirm patency, then re-irrigate to liberate debris from the canal.
ProTaper finishing criteria:
- Following the use of the Protaper File F1, the ProTaper Finishing Criteria is to gauge the size of the foramen with a Manuale file 20 to determine if this instrument is snug or loose at length, If the 20 hand file is snug at length, then the canal is fully shaped and, if irrigation protocols have been followed, ready to pack.
- if the 20 hand file is loose at length, then gauge the size of the foramen with a 25 tapered hand file. If the 25 file is snug at length, then the canal is fully shaped and ready to pack.
- If the 25 file is short of length, proceed to the Protaper File F2 and, when necessary, the Protaper File F3, the Protaper File F4, and the Protaper File F5, gauging after each ProTaper Finisher with the same D0 correspondingly sized hand file.
- If the 50 hand file is loose at length, then use alternative NiTi rotary or manual files to finish the apical extent of these larger, easier, and more straightforward canals.
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