What is the best method to keep a crown glued on a back molar when it keeps falling off?

Question

My dentist took off too much tooth structure when preparing my lower left molar (the furthest back one) for a crown. In addition, the top surface is slanted down rather than straight across. My crown has not stayed glued on. I am left with a little stump for a molar now. Is there some sort of material (if so, what kind?)that can be added to my molar to make it high enough for a crown and to make the top surface straight? Is this material reliable? I was told to get a gingevectomy done to remove gum tissue to expose more tooth structure, but I wonder if I can avoid this by getting material applied on top instead. Which is more reliable-core build up/adding material to a tooth or gingevectomy for keeping a crown glued onto a short molar?

Answer 1

SASHA,
I UNDERSTAND YOUR SITUATION COMPLETELY. THE REASON THIS CROWN FELL OFF OR DOES NOT STAY ON IS BECAUSE OF INSUFFICIENT RETENTION AND PREPARATION OF THE CROWN SHAPE. THE ONE TRUE WAY TO GUARANTEE COMPLETE SUCCESS IS TO HAVE CROWN LENGTHENING (NOT JUST A GINGIVECTOMY), IN THIS WAY THERE WILL ACTUALLY BE MORE TOOTH STRUCTURE TO HOLD THE CROWN IN PLACE. THERE ARE CERTAIN ADHESIVE CEMENTS THAT ARE MUCH STRONGER THAN TRADITIONAL CEMENTS. EVEN WITH A BUILDUP WITH COMPOSITE MATERIAL, BECAUSE COMPOSITE MUST BE GLUED TO THE TOOTH TO RETAIN THE BUILDUP THAT RETAINS THE CROWN, AN ADHESIVE BOND IS NEVER THE SAME AS A REAL TOOTH.
THE REASON FOR ALL OF THIS IS PRIMARILY TO ESTABLISH RETENTION FORM, THAT IS TO PREPARE THE TOOTH IN SUCH A WAY AS TO GAIN THE PROPER SHAPE TO KEEP THE CROWN FROM FALLING OFF.
THE PRIMARY REASON WHY A GINGIVECTOMY ALONE WILL NOT BE SUFFICIENT IS THAT THERE MUST BE BIOLOGIC SPACE BETWEEN THE BONE AND THE GINGIVAL MARGIN, OR SPACE BETWEEN THE MARGIN AND THE BONE. ADDITIONALLY, SUFFICIENT SPACE MUST BE THERE TO RETAIN THE CROWN. FOR THESE REASONS CROWN LENGTHENING IS THE IDEAL CHOICE.
ps. never try to use instant glue for this,lol

Answer 2

First off crowns are not "glued" on, they are cemented and often times you cannot take them off without having to cut them in half. So usually it is a moisture issue. When you say it is a porcelain crown, let's hope not. Hopefully it is a porcelain fused to metal crown (PFM). An all porcelain crown is not a good idea for molars since they take most of the forces when chewing. It could be a very swollow prep. (short) which would not allow for maximum retention. That would explain the temp coming off also. Sometimes there is not enough room (in the bite) to stack porcelain on a crown, and in that case you have to have a full cast crown (all metal, usually gold) made so that you can keep the prep taller. If a patient in no way will agree to a full cast crown the doctor is forced to take the prep down smaller to make room for porcelain. Some people have a close or tight bite. Not sure if this is the case with you, i am just throwing a few things out there for you to think about. Is it a second molar? or last in the row? These are the ones that are usually the biggest challenge for retention. Her explanation on the fracture could be legit. This could simply be her view (or answer) and it is not so much her trying to feed you a line. You can see someone else if you do not trust her answers, this is really the only thing you can do. Different doctors have different technique for short preps. like placing retention grooves in the prep and taking a new impression and the crown will be cast with those notches or grooves. This is done all the time, but not all doctors practice the same way. I hope I gave you a few things to think about and I wish you the best with this problem. All the best :)

Answer 3

Obviously, I havent seen the tooth, but a gingivectomy seems harsh. The actual shape needed for a crown varies, so your dentist may have been correct in the first place, but his treatment plan or method hasnt worked.
You could try going to a different dentist and see if he can build up the core with composite - a plastic resin filling material, and maybe a new crown too. You need to get someone else to have a look at this by the sounds of it!!!
Alternatively, complain at the practice where you had the crown done. They're usually guaranteed for either two or three years afterwards, and see if the dentist will try to correct the work he has already done.
As for the composite, I quite like composite: i think its very good: its the stuff used for white fillings. It's fairly strong, lasts about ten years as a filling, and is set in the dental surgery with a blue light cure.

If you want a cheaper DIY solution,, (or more temopory solution until you find another dentist!) go to your chemist and buy a tempory filling kit. This is a water and powder solution, where you mix the two together to temporarily repair a lost filling. MIx a large amount of it extra thick, so you can roll it between thumb and forefinger, put it in the crown and stick it on. Wipe away the excess around the edge (carefully!) and see how you go.

Good luck

Answer 4

Dr. Albert is right, but if you came to me with this problem (after some OTHER dentist made a bad crown, of course), I'd try cementing it with "Metabond" at least once before giving up on the crown. If your dentist doesn't have Metabond (or similar Panavia), it is because it costs $250 for an intro kit.

I have not seen your tooth, but I doubt there is sufficient room between this tooth and the upper tooth to add something onto your lower tooth so you can start over again. That's probably what led to your problems in the first place.

Answer 5

I think you need to see another dentist, it was shoddy workmanship to leave you without enough tooth for the crown to fit properly!..;

Answer 6

go to a drug store. tell the pharmisist that you need some like tepmorary cavity filler, or something of that nature. then, put it in your cap the next time it comes off. it is not perement but it will help. sorry i can't be more of a source. good luck!

Answer 7

See another dentist. There is no home remedy for something like this.

Answer 8

there is a sort of glue that you can buy i dont know the name of it but they do sell it at wallmart where you would find the tooth brushes and floss it is a do it yourself tooth fixer :) good luck:)

Answer 9

go back to the denist or go to drug story and buy the temp-cement until time allow u to see denist

Answer 10

http://www.drugstore.com/products/prod.asp?pid=46668&catid=15380&trx=GFI-0-EVGR-11695&trxp1=15380&trxp2=46668&trxp3=1&trxp4=4&btrx=BUY-GFI-0-EVGR-.........This can be bought at your local drug store