In the root canal treatment of deciduous teeth, the tip design of the platinum primary tooth file plays a vital role and profoundly affects the morphology of the root canal preparation and the treatment effect.
The tip of the platinum primary tooth file usually has a special design. Its sharpness is moderate, which can effectively enter the narrow root canal opening of deciduous teeth, and avoid accidental perforation of the side wall of the root canal due to excessive sharpness. For example, some platinum primary tooth files use a modified conical tip. This design can follow the natural curvature of the root canal when entering the root canal for the first time, and go deeper smoothly, reducing unnecessary scraping and damage to the tissue around the root canal, laying a good foundation for subsequent root canal preparation.
The cutting edge angle of the tip is also a key factor. A reasonable cutting edge angle can effectively remove the infected substances and pulp tissue residues in the root canal. When the cutting edge angle forms a proper contact with the root canal wall, the dentin can be evenly cut during the rotation or pulling action, so that the root canal wall is gradually trimmed and expanded, forming a smoother and continuous preparation shape. If the angle is not good, it may lead to local over-cutting, forming a weak area of the root canal wall, and even causing root canal deviation and other undesirable shapes.
The balance between the flexibility and rigidity of the platinum primary tooth file tip has a significant impact on the root canal preparation shape. When encountering a curved root canal, the tip with a certain degree of flexibility can follow the curvature of the root canal, prevent the file from breaking, and ensure effective cutting at the curved part. It can bend and deform moderately at the bend, and evenly disperse the cutting force, so that the shape of the prepared root canal transitions naturally at the bend, avoiding abnormal shapes such as steps or elbow bends, and ensuring that the entire root canal presents a gradually tapered and smooth tapered structure from the crown to the apex, which is conducive to the tight filling of the root canal filling material and improves the success rate of treatment.
In addition, the design of the tip is also related to the feel of the operation. A well-designed tip allows the doctor to more accurately perceive the situation inside the root canal during the operation, such as the narrowness of the root canal and the presence of branches. This helps doctors to adjust the operation force and direction in time according to actual conditions, further optimize the shape of root canal preparation, and enable root canal treatment of deciduous teeth to be performed more accurately and efficiently, thereby ensuring the normal physiological absorption of the roots of deciduous teeth after treatment and the smooth eruption of permanent teeth to the greatest extent.
