Temporary crowns are usually made from acrylic, composite or aluminum and can be made and fitted to a tooth rapidly, in 6-15 minutes. These crowns are usually cemented in with temporary cement and must last until a permanent crown can be fabricated for a prepared tooth. Although some temporary crowns can be made as 'interim ' restorations and can function for up to a year or more, they do tend to experience more rapid wear and breakage than permanent crowns.
A permanent Crown is custom made to fit your prepared teeth and the fit is verified in your mouth. It is often made from porcelain fused to a metal substructure . Other types of Permanent crowns can be made from gold, all porcelain, or porcelain bonded to zirconium.
Some dentists, using emerging technology, are preparing teeth for crowns, taking optical impressions and using cad cam technology to mill crowns from Zirconium blocks. These crowns can be fabricated while the patient is in the chair . Teeth can be prepared for a crown and it can be inserted in the same visit and no temporary is even necessary!
All permanent crowns are made from durable materials that wear well and when made well can last between 10 an 30 years when cemented with a permanent cement.
Wednesday, April 29, 2009
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2 comments:
Dr. Spindel,
I have acute sensitivity when I floss down and around a crown on my second to last molar in the lower right jaw. This was recently crowned, and the sensitivity began at this point. This tooth has not much structure left (the area that was left before the crowning); the tooth has been crowned several times, most recently over a month ago.
Is the floss touching the tooth structure under the crown, or something else, or bad margins/crowning? My dentist, who I think is very good (this is the first crowning by him, for me, and 1st on this tooth by him) and came highly recommended, said that the sensitivity is associated with my improper flossing (I had previously just popped in and out, not wrapped around that tooth - but part of that is due to that sensitivity!). I don't think I have any hot/cold sensitivities on this tooth.
Your thoughts?
Thanks,
Josh
Sometimes crowns do not cover every bit of prepared tooth. This tiny bit of uncovered tooth can be sensitive to touch. Often this sensitivity goes away somewhat with time and is only a problem when the tooth is touched at that exact spot. If it is only a small area and the crown is fitting I would not worry about it.
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