**The Techniques of Rotary NiTi Instrumentation** The University of Western Australia, School of Dentistry Dr Mostafa Elkholy, BDS, MSc, PhD The University of Western Australia logo Man shrugging under “Shaping Parametres” title text Shaping **Parametres** **Cross Section** # **Shaping Parametres** ## **Cross Sectio > [!note] > The cross-sectional design of a file is fundamental to its function. Key elements include the core and the land. - ==**The Core:** This is the central cylindrical part of the file, bordered by the flutes. Its diameter directly influences the file's flexibility and resistance to torsion. The core's taper can vary along the file's length to modify these properties.== - ==**The Land:** This is the surface between flutes that projects from the central axis. The land is designed to: - ==Reduce the n** Shaping Parameters **Rake Angle** ## **Rake Ang > [!note] > The rake angle is the angle formed by the leading (cutting) edge and the radius of the file when viewed in cross-section. It determines how the file interacts with dentin. - ==**Positive (Cutting) Rake Angle:** The angle is obtuse, resulting in an active cutting or le** Shaping Parametres **Helical** **Angle** ## **Helical Ang > [!note] > This is the angle that the cutting edge makes with the long axis of the file. The helical angle is responsible for augering debris coronally out of the canal. A higher helical angle can increase the screw-in effect of the file. ### Additional File Components - ==**The Flute:** The groove on the working surface that collects and removes dentin chips and tissue. Its effectiveness depends on its depth, width, and configuration.== - ==**The Pitch:** The distance between corresponding points on two adjacent leading edges.== le** Shaping **Parametres** **Kinematics** ## **Kinemati - ==**Reciprocation:** Based on the balanced-force concept, this involves unequal clockwise (CW) and counter-clockwise (CCW) motions. The cutting angle is larger than the disengaging angle, allowing the file to advance without exceeding its elastic limit.== - ==**Asymmetrical Rotary Motion:** Generated by an off-center file design, this creates waves of motion along the instrument, reducing stress and improving debris removal.== - ==**Adaptive Motion:** A smart motion where the motor adjusts the angle of reciprocation based on the intracanal stress detected.== - ==**Vertical Vibration:** Used by systems like the Self-Adjusting File (SAF), which combines a short vertical stroke with a vibrating movement.== cs** Shaping **Parametres** **Rotation Mass** ## **Rotation Mas > [!note] > The distribution of the file's mass relative to its center of rotation can be manipulated in modern file designs. By creating an **offset center of mass**, the file produces a mechanical wave of motion as it rotates, which minimizes engagement with dentin and enhances debris removal. This is a key feature of 5th generation files. s** Shaping **Parametres** **Number of Instruments** ## **Number of Instruments > [!note] > The number of files required to prepare a canal has decreased with each generation of NiTi systems. - ==**First Generation:** Required numerous files to achieve preparation objectives.== - ==**Second & Third Generation:** Reduced the number of instruments needed.== - ==**Fourth & Fifth Generation:** Often feature single-file techniques.== ** **Taper** **Shaping Parameters** Diagram showing three taper shapes with values 25, 2%, 4%, and 6% labeled in red. ## **Tap > [!note] > Taper is the rate at which the file's diameter increases from the tip towards the handle, expressed in millimeters per millimeter (e.g., .04, .06) or as a percentage (e.g., 4%, 6%). - ==**Fixed Taper:** The taper is constant along the entire working surface.== - ==**Variable/Progressive Taper:** The taper changes along the cutting surface, which can help limit the cutting action to specific regions of the canal and reduce the risk of taper lock.== er** ProTaper Next® instrument specifications table with X1 to X5 files, showing taper percentages and diameters for active part lengths (16mm, 13mm, 9mm, 6mm, 3mm, 1mm) and tip diameters. Comparison chart of ProTaper Next (DentslySirona) File Shapes and ExactTaper H DC vs DC Taper H (V Taper 2H) with labeled file types and measurements. Shaping **Parametres** **Alloy** # Causes of NiTi Instrument Fracture > [!warning] > Instrument separation is a primary concern in rotary endodontics. The main causes are cyclic fatigue and torsional failure. ### I- Cyclic Fatigue > [!note] > This occurs when a file rotates freely in a curved canal. The instrument is subjected to repeated cycles of tension and compression, leading to the propagation of micro-cracks and eventual fracture. ### II- Torsional Failure > [!note] > This happens when the tip or a portion of the file binds in the canal while the motor continues to rotate. The torque exceeds the instrument's ultimate tensile strength, causing it to shear and break. ### III- Mixed Mode > [!note] > In many clinical situations, both cyclic fatigue and torsional stress act simultaneously to cause fracture, as stress from both bending and torsion can concentrate at the same location on the file. ## **All > [!note] > Nickel titanium is an oy** Six endodontic rotary files with varying taper and color-coded bands The Rules of NiTi Instrumentation title with gavel and old book on wood background Diagram of a horn with internal spiral structure and red tip. Cyclic fatigue testing setup and resulting material failure Close-up of a metallic drill bit with a spiral flute, labeled "Cyclic Fatigue" in a blue box. Diagram showing torsional stresses with red arrows indicating force direction on a blue triangular shape, alongside a photo of a wire being twisted by a tool. Medical professional in blue scrubs and gloves against a yellow background, with the word "How?" written in white text. Advance a file into the canal with no more than 1 mm increments with insert/withdraw motions. Canal wall engagement Torsional stresses # **General Principles of Instrumentation ### Relationships of File Design and Canal Anatomy 1. ==A more **efficient cutting design** requires less torque and pressure.== 2. ==In a straight canal, torsional strength is related to the **square of the file's diameter**.== 3. ==In a curved canal, fatigue resistance has an **inverse relationship with the square of the file's diameter**.== 4. ==The torque required is directly proportional to the **surface area of file engagement**.== 5. ==Fatigue increases with the **number of rotations** and the **degree of canal curvature**.== 6. ==For efficiency, smaller engagement areas allow for **greater rotation speed**.== 7. ==More spirals per unit length (**higher helical angle**) increase flexibility but decrease torsional resistance.== 8. ==Fewer spirals per unit length (**lower helical angle**) increase rigidity and torsional resistance.== 9. ==Sharper cutting blades should be paired with **fewer spirals** (lower helical angle).== 10. ==A greater number of flutes increases the tendency to **screw into and bind** in the canal.== ### Principles for Successful Use of NiTi Rotary Files 1. ==**Straight-Line Access:** Poor access preparation is a primary cause of procedural errors.== 2. ==**Passive Technique:** Never force NiTi instruments. If resistance is met, stop, improve coronal taper, and verify the glide path.== 3. ==**Analyze Anatomy:** Identify and carefully instrument difficult canals.== 4. ==**Avoid Overuse:** Replace files after use in a particularly difficult canal or after a set number of cases. Single-use is safest.== 5. ==**Do Not Bypass Ledges:** Confirm a smooth glide path with a hand file before using a rotary instrument.== 6. ==**Avoid Frictional Fit:** Do not engage the entire length of the file's cutting blade at once to prevent taper lock.== 7. ==**Smooth Motion:** Avoid sudden starts and stops inside the canal. Use a smooth, continuous motion.== 8. ==**Inspect Instruments:** Always inspect files before use. If a NiTi file is bent, it is fatigued and must be discarded.== 9. ==**Control Working Length:** Maintain precise control over the working length to prevent procedural errors like perforation or creating a new ledge if a file breaks unnoticed.== ** - Advance a file into the canal with no more than 1 mm increments with insert/withdraw motions. - Canal wall engagement - Torsional stresses Transparent microfluidic device with a 1mm scale indicator, set against a blue background. A minimal **specific pressure** needs to be applied. - A minimal **specific pressure** needs to be applied. Tip of the fingers as close as possible to the tip of the file - Tip of the fingers as close as possible to the tip of the file If that pressure needs to be increased in order for additional advancement change to a different tapered file or **manual enlarge** coronal to this position - If that pressure needs to be increased in order for additional advancement change to a different tapered file or **manual enlarge** coronal to this position if a negative pressure (screw-in action) is encountered, change to a different tapered file or **manual** **enlarge** coronal to this position - if a negative pressure (screw-in action) is encountered, change to a different tapered file or **manual** **enlarge** coronal to this position Always instrument in **WET CONDITIONS** - Always instrument in **WET CONDITIONS** Diagram illustrating three stages of a dental root canal procedure: initial infection, cleaning and shaping of the canal, and final filling of the canal. Close-up image of dental procedure showing teeth isolated with a rubber dam and clamps, with visible tooth decay Just kiss the apex - Just kiss the apex Diagram comparing two foot arches: left shows a high arch with red arrows indicating pressure points along a yellow line; right shows a flat arch with a continuous white line along the sole. Minimize contact area with the file - Minimize contact area with the file Blue inverted triangle with red arrows pointing inward from both sides. # Endodontic Motors > [!note] > The motor used to drive NiTi files is critical for safe and effective instrumentation. - ==**Electric Motors:** Motors with gear reduction are ideal because they provide constant RPM and torque. They can be programmed for various motions, including reciprocation.== - ==**Torque and Speed Control:** Modern motors have presets for RPM and torque, but they can deliver forces far exceeding the fracture limit of a file. Clinicians must understand and use the manufacturer's recommended settings.== - ==**Minimizing Fracture Risk:** To prevent taper lock and fracture, rotary instruments should not be forced apically. The use of high-taper instruments in acute apical curves should be limited to reduce the risk of cyclic fatigue.== Two diagrams showing light rays interacting with a blue triangular prism. Left diagram: rays enter and exit the prism, bending at each interface. Right diagram: rays enter the prism, converge at the base, and exit with a single ray diverging. **Root Canal Shaping** Scouting Shaping of coronal 2/3 Patency & W.L.D. Glide Path Shape the canal Gauge & finishing # **Root Canal Shaping** - Scouting - Shaping of coronal 2/3 - Patency & W.L.D. - Glide Path - Shape the canal - Gauge & finishing Silhouetted figures in a cave passage illuminated by headlamps, illustrating exploration or "scouting" in a narrow, rocky environment Intraoral image showing a dental procedure involving access to the pulp chamber of a tooth, labeled "Scouting the coronal 2/3". **Preflaring** pre-enlargement of the coronal third of the root canal before determination of the WL Plotino et al, J Endod 2020;46:707-729 ## **Preflaring** pre-enlargement of the coronal third of the root canal before determination of the WL Plotino et al, J Endod 2020;46:707-729 **Preflaring** **Lessen the initial canal curvature** Kimura et al, J Endod 2020;46:232–7. **Reduces the change of the working length** Vasconcelos et al. J Endod 2016;42:1683–6. ### **Advantages of Preflaring** - **Lessen the initial canal curvature** - Kimura et al, J Endod 2020;46:232–7. - **Reduces the change of the working length** - Vasconcelos et al. J Endod 2016;42:1683–6. **Preflaring** Better penetration depth of the irritant at early shaping stages And less apical debris extrusion Ferraz et al, Int Endod J 2001;34:354–8 - Better penetration depth of the irritant at early shaping stages - And less apical debris extrusion - Ferraz et al, Int Endod J 2001;34:354–8 **Preflaring** **Improve tactile sensation of the apical constriction** Tan et al, Int Endod J 2002;35:752–8. - **Improve tactile sensation of the apical constriction** - Tan et al, Int Endod J 2002;35:752–8. **Preflaring** **Reduce the torsional stresses due to taper lock** Blum et al, Int Endod J 1999;32:24–31 . Diagram illustrating torsional stress reduction with red arrows indicating force direction around a tapered object. - **Reduce the torsional stresses due to taper lock** - Blum et al, Int Endod J 1999;32:24–31 . # Advantages of the preflaring - Lessen the initial canal curvature - Reduce change of W.L. - Better tactile sensation - Better penetration of irritant - Reduce torsional stresses - Reduce instrument breakage ### **Summary of Preflaring Advantages** - Lessen the initial canal curvature - Reduce change of W.L. - Better tactile sensation - Better penetration of irritant - Reduce torsional stresses - Reduce instrument breakage **Scouting** **Root Canal Shaping** **Shaping of coronal 2/3** **Patency & W.L.D.** **Glide Path** **Shape the canal** **Gauge & finishing** **Apical Patency** A technique where the apical portion of the canal is maintained free of debris by recapitulation with a small file through the apical foramen. AAE Glossary for Endodontic Term ## **Apical Patency** A technique where the apical portion of the canal is maintained free of debris by recapitulation with a small file through the apical foramen. AAE Glossary for Endodontic Term **Working Length determination** The distance from a coronal reference point to the point at which canal preparation and obturation should terminate AAE Glossary for Endodontic Term ## **Working Length determination** The distance from a coronal reference point to the point at which canal preparation and obturation should terminate AAE Glossary for Endodontic Term **Review Article** # Clinical Efficacy of Electronic Apex Locators: Systematic Review *Jorge N.R. Martins, DDS, MSc,*<sup>∗†‡</sup> *Duarte Marques, DDS, PhD,*<sup>∗§∥</sup> *António Mata, DMD, PhD, FICD,*<sup>∗§¶</sup> *and João Caramês, DDS, PhD, FICD*<sup>∗∥</sup> in this review. **Conclusions:** Although the available scientific evidence base is short and at considerable risk of bias, it is still possible to conclude that the apical locator reduces the patient radiation exposure and also that the **electronic method may perform better on the working length determination.** At least one radiographic control should be performed to detect possible errors of the electronic devices. *(J Endod 2014;40:759–777)* Hand holding a white electronic apex locator device with "Dentsply Sirona" branding. ### **Review Article: Clinical Efficacy of Electronic Apex Locators: Systematic Review** *Jorge N.R. Martins, DDS, MSc,*<sup>∗†‡</sup> *Duarte Marques, DDS, PhD,*<sup>∗§∥</sup> *António Mata, DMD, PhD, FICD,*<sup>∗§¶</sup> *and João Caramês, DDS, PhD, FICD*<sup>∗∥</sup> in this review. **Conclusions:** Although the available scientific evidence base is short and at considerable risk of bias, it is still possible to conclude that the apical locator reduces the patient radiation exposure and also that the **electronic method may perform better on the working length determination.** At least one radiographic control should be performed to detect possible errors of the electronic devices. *(J Endod 2014;40:759–777)* **Glide Path** A file can enter from the canal orifice passing smoothly along the canal walls to the apical terminus in a simple, repeatable, and predictable manner, resulting in a “super-loose” SS file size 10 Yared, Int Endod J 2008; 41:339-44 ## **Glide Path** A file can enter from the canal orifice passing smoothly along the canal walls to the apical terminus in a simple, repeatable, and predictable manner, resulting in a “super-loose” SS file size 10 Yared, Int Endod J 2008; 41:339-44 A damaged asphalt road with multiple potholes and cracks, surrounded by greenery on both sides. # Modifications to Improve NiTi Performance ### 1. Surface Treatments - ==**Electropolishing (EP):** An electrochemical process that removes surface irregularities, cracks, and stresses from the grinding process. It is intended to improve fracture resistance and corrosion resistance, though it may dull cutting edges.== ### 2. Metallurgical Enhancements (Heat Treatment) - ==**M-Wire:** A NiTi alloy created through a proprietary thermomechanical process. It exhibits greater flexibility and cyclic fatigue resistance due to the presence of both Martensite and R-phase crystal structures at body temperature.== - ==**R-Phase:** A unique manufacturing process involving heat treatment and twisting of the NiTi wire while it is in the R-phase. The R-phase has a lower shear modulus, making the files more flexible. This is used for Twisted Files (TF).== - ==**Controlled Memory (CM) Wire:** A thermomechanically treated alloy that does not possess superelasticity at body temperature. These files are in the martensite phase, can be pre-bent, and do not spring back, which reduces straightening forces in curved canals.== ### 3. Manufacturing Methods - ==**Twisted Files (TF):** Instead of grinding, these files are created by twisting the raw NiTi wire, which is claimed to preserve the grain structure and enhance durability.== - ==**Electric Discharge Machining (EDM):** A non-contact machining process that uses pulsed electrical discharge to shape the file. This avoids the surface defects and micro-cracks associated with traditional grinding.== Road roller compacting freshly laid asphalt # Evolution of NiTi File Systems (Generations) ### First Generation (Mid-1990s) - ==**Design:** Passive cutting radial lands and fixed tapers (e.g., 4%, 6%).== - ==**Key Feature:** Radial lands helped keep the file centered in curvatures.== - ==**Example:** Early GT files offered single-file fixed tapers of 6%, 8%, 10%, and 12%.== - ==**Limitation:** Required a large number of files for preparation.== ### Second Generation (2001) - ==**Design:** Active cutting edges.== - ==**Key Feature:** Introduction of progressively tapered designs (e.g., ProTaper), where a single file has multiple tapers. This limits the cutting action to specific zones and reduces the number of files needed. Some systems (e.g., EndoSequence, BioRaCe) used alternating contact points on fixed-taper files to reduce taper lock.== - ==**Challenge:** Electropolishing, used to smooth surfaces, was found to dull cutting edges, requiring more inward pressure and increasing the risk of taper lock.== ### Third Generation (2007) - ==**Design:** Focus on improving NiTi metallurgy through heat treatment.== - ==**Key Feature:** Heating and cooling methods were used to alter the phase transition temperature, creating alloys more resistant to cyclic fatigue.== - ==**Examples:** Twisted File (TF), Hyflex, and files made with M-Wire (e.g., Vortex, WaveOne). These files are significantly more flexible and durable.== ### Fourth Generation - ==**Design:** Utilization of reciprocating motion.== - ==**Key Feature:** Instead of full 360° rotation, files are driven in an unequal bidirectional motion. The engaging (cutting) angle is greater than the disengaging angle, allowing the file to advance apically while minimizing torsional stress. After several cycles, the file completes a full rotation.== - ==**Examples:** WaveOne and Reciproc systems, which popularized the single-file shaping concept.== - ==**Other Innovations:** The Self Adjusting File (SAF) uses a compressible, lattice-like tube design with vertical vibration and constant irrigation.== ### Fifth Generation - ==**Design:** Offset center of mass and/or center of rotation.== - ==**Key Feature:** The offset design creates a mechanical wave of motion that travels along the file. This minimizes the contact between the file and dentin, improving flexibility and debris augering.== - ==**Examples:** Revo-S, One Shape, and ProTaper Next (PTN).== > [!abstract] Note on Classification > The classification of instruments into generations can vary between manufacturers, and there may be overlap in the technologies used. Airplane landing at sunset on a runway Occlusal view of a tooth with a gold inlay restoration A row of colorful acupuncture needles with plastic handles arranged diagonally on a blue textured surface. Four types of dental endodontic files: PathFile™, ProGlider®, WaveOne® Gold Glider, and TruNatomy Glider, each with distinct handle colors and file designs. Dental endodontic files with color-coded handles arranged on a blue textured surface, alongside a dental handpiece. # Techniques of shaping **Single length technique** **Crown down technique** Diagram showing a blue inverted triangle with a red outline, likely illustrating a shaping technique. # **Techniques of shaping** - **Single length technique** - **Crown down technique** Crown down technique Diagram illustrating the crown down technique with a blue inverted triangle intersected by red and green lines. ## **Crown down technique** Crown down technique Diagram illustrating the crown down technique with a red inverted triangle and colored lines indicating procedural paths. **Crown down technique** Inverted yellow triangle with red and green lines, labeled "Crown down technique" Crown down technique Diagram illustrating the crown down technique with colored lines forming a V-shape. **Crown down technique** Diagram illustrating the crown down technique with a red inverted triangle, bordered by yellow and green lines, under a horizontal red line. Crown down technique Diagram illustrating the crown down technique with colored lines forming a V-shape, labeled with red, yellow, and green segments. Crown down technique Diagram illustrating the crown down technique with a yellow inverted triangle, red horizontal lines at the top, and colored lines (orange, blue, red) outlining the shape. Crown down technique Diagram illustrating the crown down technique with a red inverted triangle and colored lines. **Crown down technique** Diagram showing a red V-shaped structure with two converging lines meeting at a point, labeled "Crown down technique" above. Three dental files labeled 30/08, 25/06, and 30/04, with blue and red color-coded bands on their handles. **ProTaper Gold®** ProTaper Gold dental instruments labeled SX, S1, S2, F1, F2, F3, F4, F5 # **ProTaper Gold®** ProTaper Gold® 0.19 / .04v 0.18 / .02v 0.20 / .04v SX S1 S2 Three ProTaper Gold endodontic files labeled SX, S1, S2 with corresponding taper specifications above each. - **SX**: 0.19 / .04v - **S1**: 0.18 / .02v - **S2**: 0.20 / .04v **ProTaper Gold®** 0.20 / .07v 0.25 / .08v 0.30 / .09v Three dental files labeled F1, F2, F3 with color-coded handles and specifications - 0.20 / .07v - 0.25 / .08v - 0.30 / .09v Dental X-ray with red annotation highlighting a tooth structure. Diagram illustrating a sequence of dental endodontic instruments and steps, including scouting, glide path preparation, and gauging, with labeled tools and procedural notes. Close-up of a dental procedure showing a tooth with a dental tool and a red-orange object, possibly a dental instrument or material, in a clinical setting. ```mermaid flowchart LR A[Gauge with size 25] -->|If loose| B[Enlarge one more size] B --> C[Gauge again with size 30] C --> D[Check apical size] ``` ## **Gauging & Finishing** ```mermaid flowchart LR A[Gauge with size 25] -->|If loose| B[Enlarge one more size] B --> C[Gauge again with size 30] C --> D[Check apical size] ``` A fan-like arrangement of colorful matchsticks with variously colored tips, set against a plain white background. **How?** Rules of NiTi instrumentation Techniques of shaping Steps of shaping Sample protocol # **Summary of Topics** - Rules of NiTi instrumentation - Techniques of shaping - Steps of shaping - Sample protocol [[R3 The Techniques of Rotary NiTi Instrumentation.pdf#page=3|R3 The Techniques of Rotary NiTi Instrumentation, p.3]] [[R3 The Techniques of Rotary NiTi Instrumentation.pdf#page=4|R3 The 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