Hi, I had rct done on tokth#46 suspecting a fracture. Endodontist couldn't see any fracture and did root canal. I have to do core buildup and crown on it. My dentist has mentioned like core buildup, including any pins when required and porcelain crown placement. I don't know what the pins mean? Do they put in any screw to our tooth before the crown? Is it safe to have the pin inside? Is it a normal procedure for having the pin before the crown placement? I am worried to have that metal inside the tooth. It will affect later? Will they remove the pin later or it will be placed forever? Any inputs please. Is it considered as a metal? I am concerned about my upcoming imaging too. I have few mri and ct to be taken. If this metal inside the mouth, I am not sure if it's considered as metal. Is placing the pin is must for the crown??