There are many clinical factors that lead to the breakage of high speed dental burs, such as the selection of burs, the concentricity of the base rod, disinfection and other factors.
Correct choice of surgical length burs shape
(1) Selection of the overall length of the turning needle
Surgical dental extraction burs have always been the "hardest hit area" for broken burs. The length of the commonly used clinically longer dental extraction burs is mostly between 25-33mm. If this kind of needle breaks, the broken needle will mostly be located between 2-8mm at the tip. The correct selection of the needle tip length and working end diameter is also one of the important ways to reduce the needle breakage rate.
Some doctors believe that the longer the dental extraction bur, the more convenient the clinical operation will be. However, with the growth of burs, the operating field has indeed been greatly improved, but the limited operating space of the posterior teeth will greatly reduce the operational flexibility of lengthened burs. In this case, the tip of the needle is also prone to breakage.
In addition, when using a high-speed handpiece, in order to obtain ideal concentricity, the speed of the lengthened needle will also be reduced accordingly. For example, the recommended rotation speed of 25-33mm long surgical burs commonly used in clinical practice is 80,000 rpm, and the maximum rotation speed is controlled at 100,000 rpm. As for the 19mm traditional crack drill, the recommended rotation speed is 160,000 rpm.
After the overall length of the dental extraction bur is determined, the length and maximum diameter of the working end are also related to clinical use.
(2) Selection of working end of turning needle
The diameter of the base rod at the working end of a high-speed handpiece is 1.6mm. Clinicians sometimes choose a bur with a smaller diameter at the working end in order to pursue minimal invasiveness, such as using a tooth extraction fissure drill with a working end length of 4.2mm and a maximum needle diameter of 1.2mm. When dividing teeth, it is easy for the bur neck to get stuck when the bur penetrates deep into the crown of the tooth. In such cases, clinicians habitually pry the bur hard, causing the bur to break.
The solution to this type of situation is very simple, you can use an extraction bur with a slim neck. This avoids the problem of the needle getting stuck due to the base rod being too thick.
Precautions during clinical operation of high speed bur
(1) Choose the correct speed
The longer the needle length, the slower its speed will be. For example, when we use an extended needle, it is recommended that its speed be controlled at 80,000 rpm. When preparing diamond teeth, the recommended speed is controlled at 160,000 rpm.
Note: The above-mentioned speed refers to the speed of the bur needle when using an electric motor. When using a pneumatic turbine handpiece, it is necessary to appropriately modify the output air pressure of the dental chair and adjust the speed of the handpiece to achieve the ideal cutting effect.
(2) Replacement of old needles
As the number of times the bur is used increases, the bur will also wear out, and as the number of sterilizations increases, the cutting strength will gradually decrease, and the ability to resist deformation will also gradually decrease, resulting in bur breakage during tooth extraction. Therefore, you should carefully check the wear degree of the bur needle before using it and avoid using old bur needles.
(3) Note on operating methods
When using bur needles, excessive force and continuous use of large force are the problems that cause bur needles to break. Therefore, when extracting teeth, it is necessary to rely on the linear cutting ability of the mobile phone to cut the tooth body and alveolar bone at a uniform speed and apply light contact force. During the tooth extraction process, sufficient water cooling is required, and the bur needle must not suddenly stop or pry in the hard tissue. The bur needle must be moved in and out at high speed, and stop immediately when a feeling of falling is felt to prevent the bur needle from breaking due to unbalanced force.
(4) Simple solution for bur stuck in teeth
When the bur needle is found to be broken, you should first suck up the blood and saliva, stop the bleeding in time, try not to let the patient swallow, keep the surgical field clear, expose the broken needle, and use tweezers, curettes or hemostatic forceps to take it out; if it is difficult to remove, The bur should be replaced with a new bur, and then continue to remove the bone, or continue to divide the tooth along the original section, and then use a minimally invasive dental lift to loosen the tooth, and then completely extract the tooth together with the bur. The operation should be gentle to avoid damaging the bone. plate.
If a worker wants to do his job well, he must first sharpen his tools and choose the appropriate shape and length of the turning needle. Pay attention to high-speed entry and exit during operation, and avoid using excessive pressure when separating teeth. If the needle becomes rusty or the cutting effect is reduced, the needle needs to be replaced in time. I hope that through sharing, unnecessary clinical needle breakage can be reduced, and readers can better understand dental burs and choose more suitable dental burs.
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Post time: 2024-05-06 15:40:44