Generally speaking, the type of root pile with the best retention is

Generally speaking, the type of root post with the best retention force is threaded. Because the cast post is in close contact with the root canal wall, the friction is the largest and the retention is the best, and the thread friction is the largest and the retention is the best.

Root post is a post placed in the root canal to increase the strength of teeth. At present, fiber post, titanium post and all-ceramic post are commonly used.