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Views: 0 Author: Site Editor Publish Time: 2020-09-22 Origin: Site
Endodontic files play an important role in the treatment of gums. What are the types? Which endodontic file is the best? How to use endodontic file correctly?
Different types of endodontic files
Technical progress of endodontic files
How to use endodontic file correctly
K file (named by Kerr in 1915): it is made of stainless steel wire with a square or triangular cross section. During the screwing process, the hardness of the steel wire continues to increase. The tighter the thread, the less elastic the instrument and the stronger its rigidity. K-type instruments are divided into root canal expanders and K-type files according to the density and function of the threads. The K-shaped root canal expander is mainly used to penetrate and enlarge the root canal. It works by squeezing the dentin on the root canal wall and then releasing it. This is repeated several times, causing the dentin to disintegrate and then be removed. Therefore, the cutting ability of K-type instruments is not very strong, and it is not suitable for removing a large amount of dentin. The K-shaped file is like an expander. The working blade end has a triangular or square cross section, but the working blade end thread is more dense, with 1.5 to 2.25 threads per 1 mm. The angle between the spiral blade and the long axis of the file is relatively large (close to 90. ), which is helpful for lifting and cutting the root canal side wall, mainly used to remove dentin and calcification on the root canal wall, make the wall smooth, and is the most widely used root canal preparation instrument. The K-shaped instrument is made of stainless steel and can be pre-bent into an ideal shape. When the K-type device is permanently deformed, the thread will loosen or become dense, which is easy to find. It should be discarded at this time. When using a K-type instrument, counterclockwise rotation is easier to break than clockwise rotation, and the required power is only half of that of clockwise rotation.
The H-shaped file looks like an expander, but its production method is completely different. The H file is made from a micro-turning tool on the basis of a round needle-shaped raw material. The cross-section is comma-shaped, the blade is sharp, and the cutting ability is strong. When rotating clockwise, it can cut into the dentin of the root canal wall, but the bending resistance is poor. Due to the sharp edge of the H-shaped file, unskilled people are prone to cut too deep. If it cannot be pulled or rotated counterclockwise, it will cause the instrument to break. This is rarely the case with K-files. Therefore, the H-shaped file can only be used for pulling action, which is suitable for removing a large amount of dentin from the straight root canal, but is rarely used to expand the root canal. In addition, it is very effective for removing old root fillings or cotton twist in the root canal. Compared with K-shaped root canal instruments, H files are not easy to pre-bend. Moreover, the H-type file can develop until it breaks under the condition of micro-cracks. Previously, clinically obvious external features such as loosening or densification of threads like the K-type file have not been found clinically.
During clinical use, it is found that the traditional ISO standard K-shaped root canal instruments and H-shaped files have certain limitations, such as poor elasticity, easy to produce root canal deviation when preparing to bend the root canal; average cutting ability; cutting at the tip It is easy to produce steps and so on. Therefore, some improvements were made to the traditional IS0 standard design, and even a new design was produced to produce a series of non-IS0 standard hand files. The main improvements include file tip diameter, file tip design, working blade cross-sectional shape, material and manufacturing process.
1. Complete removal of infected material from the canal space
2. Before using the large taper rotary file, make sure the glide path
3. Preserve tooth structure while reducing the risk of future vertical root fractures
4. Manage apical preparations to avoid transportation or unnecessary expansion
5. Carefully clean and shape the canal in the bifurcation area to reduce the impact on the bifurcation
The choice of endodontic file is one of the key factors for the success of root canal treatment, so make sure that the endodontic file purchased meets the sales standards.If you are looking for a high-quality endodontic file at a reasonable price, Osakadent Co.,Ltd. will provide you with the best products.
