Advantages 1, glass fiber pile modulus of elasticity is similar to the tooth tissue, which is conducive to the transfer of stress to the root surface, thus reducing the concentration of stress in the root, which can be fractured before the tooth tissue, thus playing a role in protecting the tooth tissue, reducing the risk of root fracture, so that the affected tooth has the possibility of restoration; 2, good light transmission and natural color so that the all-ceramic restoration made on it has good aesthetic properties, providing patients with a satisfactory aesthetic restoration; simple operation, the clinical production of fiber pile resin core by the doctor chairside can be completed in one visit; 3, glass fiber pile has good biocompatibility; 4, glass fiber pile resin core has good biocompatibility; 4, glass fiber pile resin core has good biocompatibility. The clinical production of fiber pile resin nuclei is carried out by the doctor at the chairside, and can be completed in one visit, reducing the number of visits; 3, the glass fiber pile has good biocompatibility; 4, the glass fiber pile has stable physical and chemical properties in the oral cavity, with strong corrosion resistance, and will not release metal ions such as nickel or beryllium in the oral environment to produce toxicity or cause human Allergic reaction, does not produce gingival margin black line, does not affect the aesthetic effect of all-ceramic restorations; 5, good repeatability, pile nucleus fracture fiber pile can be easily removed with a drill, secondary restoration, long-term restoration effect is good; 6, fiber pile super mechanical properties, with stronger bending strength and tensile strength than metal pile; 7, excellent bonding performance fiber pile with resin adhesive bonding performance is far The metal in the oral cavity will have a certain effect on the MRI image, while the fiber pile restoration has no effect. Disadvantages: 1. Pre-formed piles are not suitable for crown restorations that require a change in restoration direction; 2. Limited strength, not suitable for restorations with little remaining dentition or small restoration gaps such as deep overdentures; 3. Relatively coarse diameter, so care should be taken to prevent lateral penetration when used for posterior root canal preparation.