Description: 1.The deciduous tooth which has a large decayed part. 2.The deciduous tooth having an endodontic treatment get lower the strength of the tooth and it is prone to break,in this case it needs to fitting a crown needs to protect a tooth. 3.In case dental decay happens in the occlusal surface. 4.In case the use of the restoration material, it is prone to break because of masticatory pressure and the frequency of the second decay. - Upper right: UR2,UR3,UR4,UR5, UR6, UR7, - Upper left:UL2,UL3,UL4,UL5, UL6, UL7, - Lower right teeth:LR2,LR3,LR4,LR5, LR6, LR7 - Lower left teeth: LL2,LL3,LL4,LL5, LL6, LL7, The Permanent crown is a tooth shaped "cap" that is placed over a damaged tooth to provide it protection, fully encases the visible portion of the tooth that is exposed above the gum line. Mechanic can match the shape clamp to adjust crown, crown scissors can fix type appropriately, without skilled at first suggestion on resin model above or plaster model to practice