What is an h-file?
H-files are specially designed for shaping canals after they are previously cleaned and enlarged with K-files in root canal treatment. The H file can effectively enlarge the canal during filling motion. K file and h file can be made of stainless steel and nickel titanium materials, both of which have their own advantages.
What is the angle of an h file?
The Angle between the cutting groove and the long axis of the H file is generally in the range of 60-65 degrees. H-files are specially designed for shaping canals after they are previously cleaned and enlarged with K-files in root canal treatment. The H file can effectively enlarge the canal during filling motion.
What is the definitive management of file fractures during root canal?
The definitive management should be based on a thorough knowledge of the success rates of each treatment option, balanced against potential risks of removal or file retention. Although i … When a file fractures during root canal treatment there are several treatment options available to the clinician.
What is a root canal file made of?
This is the metal part of the file that’s inserted into your tooth’s root canal for the process of cleaning and shaping it. It’s made out of a flexible metal alloy, with steel or nickel-titanium being the ones most commonly used. These tools are actual mini files.
What are H-files in endodontics?
Sharp edged, H-Files are used for probing, permeabilization or extraction of debris. Made of stainless steel or NiTi, these files can only be used in traction because of their profile.
What is the purpose of using files in root canal therapy?
Endodontic files and reamers are surgical instruments used by dentists performing root canal treatment. They are used to clean and shape the root canal removing dead, damaged or infected material to the opening at the apex of the tooth root. Using the files provides a shape that is receptive to subs equent filling.
What are root canal files made of?
This is the metal part of the file that's inserted into your tooth's root canal for the process of cleaning and shaping it. It's made out of a flexible metal alloy, with steel or nickel-titanium being the ones most commonly used.
What are Hedstrom files used for?
Premier Hedstrom Files are used for more rapid enlargement of root canals. Note that the cutting edges are inclined backwards. The insertion is made easily since there is no cutting taking place on the insertion stroke. When the instrument is withdrawn, cutting takes place and debris is carried away from the apex.
What is the difference between K and H-files?
All K-files are mainly intended for rotary motions inside the canals. On the other hand, H-files are specially designed for shaping canals after they are previously cleaned and enlarged with K-files.
What happens when a file breaks off during a root canal?
When a file breaks in the canal, bypassing or removal can be difficult and the long-term prognosis of the tooth may be compromised. Sometimes surgery may be indicated for removal of the broken segment. Often some part of the root cannot be cleaned because of blockage by the broken file.
What is the difference between reamers and files?
The number of spirals or cutting flutes may differ, but is higher in the file than in the reamer. Another difference is that the file is usually made from a rectangular blank, whereas the reamer has a triangular cross section.
What is the difference between C file and K file?
The C+ -file can engage the dentin much better in calcific conditions with the extra stiffness and the active cutting tip, whereas a K-file will simply just “kink” at the tip end when it hits a calcified area.
What type of file is best suited for canal enlargement?
In a single-file technique, a single TF file can be used to enlarge the entire canal.
Which step in the root canal therapy takes place first?
The first appointment is the procedure itself when the infected pulp is removed. The second (and maybe third) appointment is when the root canal gets cleaned and filled with a crown or other filling to prevent infections.
What is file taper?
Noun. 1. taper file - a file with converging edges. file - a steel hand tool with small sharp teeth on some or all of its surfaces; used for smoothing wood or metal. blunt file - a file with parallel edges.
Why would you use calcium hydroxide in a pulp capping procedure?
This provides a degree of hemostasis and stimulates mineralized tissue and dentin bridge formation. Most likely, another reason for the widespread use of calcium hydroxide as a direct pulp capping agent on vital exposures is because this is the technique most dentists were taught in dental school.
K files
K files are made of rectangular blanks. Twist them so that the working end of the instrument spirals. The cross section of the K file is square. The K file is the most “universal” hand file, covering the most clinical indications. K files has moderate cutting force.
H files
The h file has a circular cross section. H file has strong cutting force and high efficiency, due to the design of screw thread. But it is easy to damage the root canal wall, so h files are designed for vertical movement, not rotary movement.
Why do dentists use hand files?
Hand files can provide tactile sensation when cleaning or shaping root canals. This allows the dentist to feel changes in resistance or angulation, which can help determine curvature, calcification and/or changes in anatomy, in which two dimensional radiographs may not always identify. This information can help determine strategies ...
What are the procedural errors in root canals?
Instrumentation of the root canal systems (RCS) can lead to procedural errors including ledging, zipping, canal perforation and apex transportation all of which can be somewhat successfully resolved through further manual corrective techniques. However, file separation whereby the instrument breaks in the canal, is the most concerning and problematic procedural error, with fractured endodontic instruments being the most commonly found object in the RCS. The incidence of file fracture has been found to range between 0.25-6% of cases. File separation will create an obstruction within the canal preventing adequate cleaning and shaping of the canal at and beyond the obstruction as well as under-filling of the RCS. This may ultimately lead to endodontic failure depending on the location at which the file fractured in the RCS.
What is endodontic file?
Endodontic files and reamers are surgical instruments used by dentists when performing root canal treatment. These tools are used to clean and shape the root canal, with the concept being to perform complete chemomechanical debridement of the root canal to the length of the apical foramen. Preparing the canal in this way facilitates ...
What are ISO files made of?
ISO files are made of stainless steel. This can be useful in smaller files (<20) but larger files have increased rigidity which can result in procedural errors. At smaller sizes the files can be pre-curved which is a major advantage for the debridement of roots with sharp curvatures.
What is a D file?
D files are a selection of bespoke rotary files that are commonly used in re-treatment cases for the efficient removal of gutta percha. They are used in sequence to remove the coronal (D1), mid (D2) and apical (D3) ⅓ root filling material more efficiently before the final shaping with conventional instruments.
What is torque in a file?
Torque relates to the required force needed in order for an instrument to carry on rotating upon encountering frictional forces. A file may bind the wall of the root canal apically due to a larger diameter of the file compared with the canal causing friction. If rotational forces are still in motion, torque may reach a critical level and the file will fracture. The torque generated from smaller canals will be greater than in larger canals, as files will bind to the canal walls more readily through friction. The greater the diameter of the instrument, the more force it can withstand despite needing increased torque however, the less resistant it becomes to cyclic fatigue. Torsional fatigue can be somewhat limited through creation of a glide path and adopting the Crown-Down technique in a bid to reduce frictional forces.
What is a barbed broach file?
Barbed broach. This file is used to remove pulp tissue (extirpation) during root canal treatment. There are sharp barbs on the file to engage the pulp tissue and remove this efficiently. These files are not used to shape the RCS.