Develop a simple and practical root canal safety chain, micro-spring clamp root canal safety chain. Micro-spring clamp root canal safety chain canal treatment, root canal treatment is an internationally accepted conventional method for the treatment of endodontic diseases and periapical diseases. Due to the complex shape of the medullary cavity, the vision of the posterior teeth is limited, the device is easily wet and lubricated, and the safety is prevented. In addition, the lack of safety chain or rubber barriers and other safety precautions make it difficult to generalize the root canal filling treatment in the country. The use of effective safety measures will create favorable conditions for the full implementation of root canal treatment. Problems with the structure of the traditional safety chain The root canal safety chain consists of three parts: the ring, the intermediate chain and the connecting clip. The requirements for the ring and the intermediate chain are simple, the key is that the connection clips connected to the expansion needle are special. The second part of the Oral Medicine textbook is shown on page 228. This part is a bolt-and-socket structure with a hole in the head. When inserting the needle, the needle tip of the needle must be inserted from the hole of the bolt until the middle and back of the rod, and then tightened. The sleeve catches the needle bar in the hole. In this way, the instrument is easily loaded and unloaded, and the needle tip is easily contaminated, and the infection is brought into the root canal. At the same time, the rubber mark must be dismantled, the operation is complicated, which is unfavorable for frequent replacement and aseptic operation of the root canal expansion needle, and the bolt sleeve is large in volume and complicated in production. It is costly and has not been widely used for many years. From the aspects of simple, fast, non-polluting needle tip, high temperature disinfection, safe and reliable, we have developed a micro-spring clamp root canal safety chain, which has been applied in clinical practice and achieved satisfactory results.
The construction of the micro spring clip This safety chain requires the same ring and intermediate chain as the conventional safety chain, and the connector is a new design micro spring clip. It consists of three parts: a coil spring connected to the middle chain is the source of the holding force. The two free ends of the coil spring project in the same direction, at an angle of about 60b. One of the arms is a ring arm with a small elliptical ring at the end, and the plane of the elliptical ring is perpendicular to the plane of the coil spring. The other arm is a hook arm with a /S0 curve at the end. The /S0 curve is in the same plane as the coil spring, and the end hook extends toward the elliptical ring. As shown in Figure A. The entire micro-clip is made of a orthodontic wire with a diameter of about 0141 mm and a length of 40 mm. The length of the finished clip is about 68mm, the diameter of the coil spring is 1mm, and the long diameter of the elliptical ring is 2mm. The size of the end hook is suitable for free access to the elliptical ring. The use method and principle of the lock type micro spring clamp Before the clinical use, the end hook is pressed into the elliptical ring, so that the near middle end of the ring slides to the middle section of the S curve, and under the elastic force of the coil spring, the ring arm The restoring force is in a static state with the downward pressure of the horizontal section of the S-curve, and the end hook is extended outside the loop. As shown in Figure B. For clinical use, insert the part between the handle of the needle and the needle bar mark into the end hook and gently pull it out laterally.
Clinical evaluation The micro-spring clamp root canal safety chain is an all-metal structure, which can be sterilized and sterilized under the high temperature and high pressure conditions required for surgical instruments. It can also be immersed and disinfected with high concentration sterilizing solution to prevent cross infection. During use, the spring clip only contacts a minor portion of the expansion needle, which does not contaminate the threaded section and the needle tip of the needle shaft, and also prevents cross-contamination of replacing the old and new expansion needles. The spring clip is small in size and does not exceed the length of the handle, and does not interfere with the original function of the expansion needle. The buckle pull force has been tested and reached more than 110kg. When the simulated root canal expansion needle is removed from the oral movement mode, it is found that in the case of the micro-clip traction, the tip of the dropped needle bar faces the pharyngeal side, and the handle end faces the mouth and outward. When pulling, the handle is preferentially pulled out of the outlet, thus eliminating the phenomenon that the micro-spring clip slides toward the needle tip and falls off when the pulling force is too large, and on the other hand, the relatively large handle cannot pass the end hook. Explain that the micro spring clip has sufficient safety. The spring clip is low in material, simple to manufacture, and easy to promote. During the clinical teaching period, all the students have one hand for the root canal preparation of molars, and have received remarkable results. They can boldly perform root canal treatment, and each person can treat more than 100 root canals per semester. Prior to this, the root canal of the molar was mostly based on dry pulp treatment and plasticizing treatment. At present, all developed countries require root canal treatment, but the proportion of domestic dentists using this method is very low. In addition to technical factors, the lack of effective and feasible safety protection is also the main reason. In order to improve the treatment level of molar pulp disease and periapical periodontitis, shorten the gap with the international, and actively promote the use of micro-spring clamp root canal safety chain, this simple and feasible safety measure should be worthy of promotion.
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