My crown fell out, the post is broken. Can the post be removed from the crown? Or do I need a new crown to insert a post?

If your crown fell out, then you would need a brand new crown, if that is even an option.  The best thing to do would be to go to a dentist a see if a new post can be placed, so that you can get a new crown on that post.  If a new post cannot be placed, then the only option for you would be to have a bridge cover that missing tooth, or get an implant to take the place of that missing tooth.  The implant option is probably about double what you would pay for the bridge, so it would be great if you are a candidate for a bridge.  Good luck and I hope this helps. Follow me if you have more questions.Sarah Thompson, DMDSt. Louis, MOReal Self 100

In my opinion, when's post fails it is time to extract the tooth and have a dental implant placed.  It will be a much more stable solution with enhanced function and aesthetics.  A second post is likely to fail causing you to pay two times to restore the tooth.  Good luck.

Most likely you need a new post and crown, however, sometimes the crown can be re-cemented successfully with a "broken" post. You should be suspicious of another issue. Crowns usually don't just fall out! If the crown is completely supported by a post, the tooth's days may be numbered. You may have some decay that caused the crown to loosen up - this is a very common scenario. See your dentist and they will discuss your options.SincerelyHank D. Michael, DMD - General, Cosmetic and Dental Implants

If the post that is inside the crown and down the root of the tooth is fractured it needs to be carefully removed from the canal.  If the tooth structure is sound and there is enough left to support a new crown then a new post and crown would be indicated.  A lot of times if the post fractured it indicates additional problems:1.  There is insufficient tooth providing structural support to the crown or2.  There was fracture of the tooth that was supporting the crown/postYour dentist needs to x-ray the tooth as well as evaluation of the surrounding bone/gum tissue to determine if there is enough solid tooth remaining to warrant restoration with a new post/core and crown.  If not, look into having the tooth removed and restoring with an implant or bridge.

Typically when a post and crown come out.  A new post and crown is needed.  Trying to retrofit an old crown to a new post is a serious compromise and may leed to future problems.