When the tooth defect is too large, of course, the defect may be due to too serious decay, resulting in the loss of most of the crown of the tooth, or due to trauma that causes the entire crown to fracture, cracking only the root or a little bit of the crown left, when the crown support is not enough, too weak, a pile should be driven. This stake is placed inside the root canal, after the root canal treatment, and a stake is placed inside the canal to support the crown. If the crown is made directly, the crown will not have enough resistance and will easily fracture, causing the crown to fall off.