Original Title: Summary of Oral Needle Knowledge Pay attention to receiving this every day. Summary of the most complete knowledge about dental needle 1 Classification of needles Classification by function: high speed, low speed (16,30,45 jrpm) Classification by length: standard, short stem, super short stem (17-26 mm) Classified by thickness: coarse, standard, fine and ultrafine Classification by use: restoration, preparation of abutment, preparation of cavity, etc. Classification by form: various forms Classified by the type of corundum: natural, artificial Classification by service life: Disposable, Repeatable 2 Model explanation T (Tapper) tapered series: (full crown preparation) TF (Tapper Flat): Flat conical head, right-angled top, used to prepare the shoulder of metal porcelain teeth TC (Tapper Cone): pointed cone with sharp tip, used for axial plane preparation TR (Tapper Round): round conical head with rounded top corner, which can be used for the preparation of all-ceramic crown shoulder. F-Series: FO: Flame-like cusp, used on the occlusal surface and lingual surface of anterior teeth Expand the full text S (Straight) straight/parallel series: no polymerization angle except SI, used for cavity preparation SF: Flat head straight line, no polymerization degree, top right angle SR: Round head, straight line,overburden drilling systems, no polymerization degree, top rounded corner SO: pointed straight shape, no polymerization degree, top 45 degrees B (Ball) ball series: ball drill BC: Ring-shaped ball drill with emery cuff BR: Spherical, ball drill without emery cuff Other models: SI: Single inverted taper, inverted taper drill DI: Double inverted taper drill WR: Discoid CR: inlay preparation series CD: Children's Cavity Preparation Series EX: Special Shape Size identification S-Short handle SS-Very Short Shank C-thick F-fine EF-very fine L-elongated type Color marking It is the indication of particle size, which is black, green,mining dth bit, blue, red, yellow and white from coarse to fine. Black: extra coarse grinding needle, particle size is about 150 microns/blade number is not more than 8, and extra coarse is represented by MLX Green: Coarse grinding needle, particle size is about 125 microns/blade number is not more than 8, and coarse is represented by C Blue: Standard grinding needle, particle size about 105 microns/blade count not more than 8, no letter/ML indicates standard Red: fine grinding needle, particle size about 45 microns/blade count 10-14, F means fine Yellow: Polished needle, particle size about 25 microns/blade count 16-20, extra fine as EF/XF White: particle size approx. 15 microns/blade count 26-30, fine as UF Generally, the blue marking ring or the one without color marking is the commonly used standard grain size needle, Tapered Rock Bit ,dth drill bits, and the cutting efficiency is higher when the grain size is medium. The cutting force of the coarse grain needle is strong, but the cutting surface is rough and the texture is obvious. The close degree between the crown and the prepared body is poor, and the fine grain needle can be used to refine it. Adaptive symptom of different forms of bur needle Our commonly used dental preparation needles include carborundum needles, tungsten steel needles and so on. Carborundum needle Diamond has high hardness and excellent physical and chemical properties. The diamond grains with a certain acute angle are adhered or electroplated according to a certain direction and spacing with the central axis of the stainless steel needle as the center of the circle to make a diamond needle with a certain ability to cut hard tissues. There are pure nickel coating, nickel-chromium coating and nickel-chromium-manganese coating according to different coatings. According to the different density of surface sand-plating, it can be divided into two-layer sand-plated needle, three-layer sand-plated needle, full-sand grinding head, etc., with the thickness ranging from several microns to tens of microns. The increase of the plating thickness can prolong the service life of the needle, improve the cutting rate, and be more environmentally friendly and cleaner. Tungsten steel needle Is formed by welding tungsten carbide powder and cobalt powder which are sintered at high temperature in vacuum or molded at high pressure on a steel rod, and is processed and trimmed by a large diamond grinding wheel. The tooth prepared in this way has a smooth surface, which can make the impression more accurate, so as to produce an all-ceramic restoration with more accurate and close-fitting edges. Tungsten steel bur meets the requirements of minimally invasive preparation of teeth.
Tungsten steel lathe needle is flat and has good performance, which is suitable for fine preparation of teeth, such as preparation of grooves, barreled holes, dovetails, etc. Example of ISO code for the needle Every regular needle that conforms to international standards has a set of ISO codes. However, the ISO code is usually indicated at the same time, especially the third and fifth groups of labels indicating the shape and diameter of the burr needle, which is convenient for clinicians to choose and use. These five sets of numbers represent certain categories and meanings: The first group of three digits-806 refers to the carborundum needle, and the tungsten steel needle is 500 The second group of three digits indicates the thickness and total length of the drill body of the bur. The first digits 1, 2 and 3 indicate that they are suitable for constant speed straight machine, constant speed bending machine and turbine respectively. 4 in the last digit indicates the regular length, and less than or greater than indicates extra short or extra long and extra long respectively. The third group of numbers is represented by six digits, and the first three digits represent the shape of the drill bit, such as round, conical, inverted conical, etc. 233-inverted cone. The last three digits indicate the type of drill bit, such as fine edge, wide edge, etc. The last group of numbers indicates the maximum diameter of the working end of the needle, and 012 indicates that the maximum diameter of the working end is 12 mm. Generally speaking, the smaller the diameter of the needle tip, the greater the allowable rotation speed, and vice versa. Problems should be paid attention to when using the needle 1. The selected needle shall be not easy to deform, have high stability and fracture resistance, have no tip collapse or desanding, and have good concentricity in rotation. 2. When cutting, the tooth tissue should be cut orderly and effectively with appropriate force (30 ~ 60 G). 3. Attention should be paid to the rotating speed of the needle, especially when operating large-diameter needles and coarse-grained needles. If the rotating speed of the needle is too high, it will produce excessive heat, causing damage to the pulp and dental tissue. 4. Do not force the needle into the turbine. If it is difficult to install, check the mobile phone and the needle carefully. 5. Please pay attention to the FG mark on the package, which is the needle used on the high-speed turbine. 6. Disinfect and sterilize the needle before each use. Needles should be cleaned frequently with a nylon brush or ultrasonic cleaner. Autoclave the needle at 135 degrees for at least 10 minutes. 7. After disinfection or cleaning, dry the needle and store it in a clean and moisture-free environment. 8. It is common in clinic that the tip of carborundum bur wears faster than the tail. At this time,DHD Drill bit, the bur should be replaced in time to avoid low cutting efficiency. 9. Turbine cooling water shall be used up to 50ml per minute. 10. After the tungsten steel needle is used, it should be cleaned and disinfected with high temperature and high pressure. Do not use chlorine-containing disinfectant to soak the needle, otherwise it will cause the tungsten steel needle to rust and become blunt. Return to Sohu to see more Responsible Editor:. wt-dthtools.com