You should have the crown checked, preferably by the dentist who iserted it. remember endodontists do root canals, so I would not go see one on your own unless it is an emergency--good chance you'll end up with a root canal procedure. It may be something as simple as a bite adjustment. let your dentist look at it.
it may also be a bubble in the cement--perhaps it was seated after the cement was already starting to set on the mixing pad. It could be many things. Root canal is always the easy way out becasue the tooth itself cant hurt anymore once the nerve is removed. You may want to ask your dentist to remove the crown and place a new tempoorary on the tooth iand see how you do. Did it need alot of "adjustment" before it was cemented?? If so, it probably did not fit on the tooth that well to begin with. Sensitivity is a sign of a malfitting crown. Spontaneous throbbing and ongoing pain with no stimulus is a sign of nerve involvement. You can always get another opinion, which I would encourage if you are not 100% confident in what your dentist tells you. In my experience it is unusual for a healthy tooth that has rceived a crown to need root canal so quickly unless there was deep decay or a large fracture. In those instances I certianly tell patients of the possibility so they are not surprised and confused if the situation arises down the road.
PS-- you do not need to remove crowns to do root canals-- a very conservative hole can usually be made right through the crown. If it is to be removed, they are not just "popped off" in most cases. Dental cements are strong, and the crowns usually need to be cut off, which s pretty easy.
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