A kind of nickel-titanium alloy gradient flexible root canal file and its manufacturing method

Abstract

The invention provides a nitinol gradient flexible root canal file, which comprises a root canal file tip part, a root canal file middle part and a root canal file root part divided along the axis of the nickel-titanium alloy gradient flexible root canal, the root canal file The inner structure of the tip of the root canal file is the martensite M phase, the middle part of the root canal file is the R phase, and the root of the root canal file is the austenite A phase. The invention also provides a manufacturing method of a nickel-titanium alloy gradient flexible root canal file. The beneficial effects of the invention are: effectively improving the use safety.

Description

technical field The invention relates to a dental instrument, in particular to a nickel-titanium alloy gradient flexible root canal file in the dental instrument and a manufacturing method thereof. Background technique As the main dental instrument, the root canal file is used to thoroughly clean the inside of the diseased root canal and the wall of the root canal, remove the diseased tissue, and create a complete and smooth root canal cavity. The working part of the root canal file has a certain cross-sectional shape, the outer contour has a certain taper, and there are helical cutting edges distributed on it, as shown in Figure 1. When the root canal file is working, it rotates at a certain speed in the root canal 1 to cut the inner surface of the root canal, so as to clean and shape the root canal, as shown in Figure 2. The root canal generally has a curved inverted cone-shaped structure. According to the structure, the root canal can be divided into three sections, th...

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Problems solved by technology

If the martensite M-phase segment is too long, although the fatigue life of the front segment of the root canal file is improved and the risk of root canal side penetration is reduced, the cutting efficiency of the C2 segment of the root canal is very low, and there is also martensite The axial distortion of the M-phase segment leads to the risk of root canal file failure; if the martensitic M-segment is too short, although it can meet the high-efficiency cutting of root canal C1 and C2 segments, it will also be like a superelastic root canal file, which is easy The root canal axis after shaping is seriously deviated from the original axis, especially in the C2 segment of the root canal

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