Hader Bar: how do I incorporate them into the overdenture?

I don't retrofit an existing denture over a hader bar; it's too difficult to get a passive fit so the denture fits snugly on the edentulous posterior ridges without rocking. you can retrofit stud (ball or locator or ERA) attachments but almost impossible with a bar. I set up my denture teeth in a waxup, verify cosmetics, phonetics etc, then make the bar and process the denture over the bar.

It is not that complicated to retrofit and existing denture to a hader bar......just be very careful not to allow any of the acrylic resin that will lock the clip in the denture, get under the bar...... Depending on how close the undersurface of the bar is to the gingival tissues..... you can place some soft boxing was under the bar, or heat up some compound and stuff under the bar, and cool quickly, ...in either case, place the clips on the bar where you want them....try in the denture to be sure that the clips are in the same place after you have removed the denture .......when the clips are in the right place, apply tin foil over the bar to act as a barrier against any resin that may spill over.......wait a few minutes having the patient stay in centric occlusion.....and then remove. After you have removed the denture, grind off any excess resin that crept into places that are not required, and check to see if the bond is well anchored....you can add more resin when the denture is in your hands and you can guide it where you want. The worst case scenario can occur if the resin creeps under the bar, and locks the denture in place, so that you can not withdraw it.......just remember where the screw access holes are in the bar, and drill through the plastic denture base to get to the screws, and lift out.

It is not that complicated to retrofit an existing denture to a hader bar......just be very careful not to allow any of the acrylic resin that will lock the clip in the denture, get under the bar...... Depending on how close the undersurface of the bar is to the gingival tissues..... you can place some soft boxing was under the bar, or heat up some compound and stuff under the bar, and cool quickly, ...in either case, place the clips on the bar where you want them....try in the denture to be sure that the clips are in the same place after you have removed the denture .......when the clips are in the right place, apply tin foil over the bar to act as a barrier against any resin that may spill over.......wait a few minutes having the patient stay in centric occlusion.....and then remove. After you have removed the denture, grind off any excess resin that crept into places that are not required, and check to see if the bond is well anchored....you can add more resin when the denture is in your hands and you can guide it where you want. The worst case scenario can occur if the resin creeps under the bar, and locks the denture in place, so that you can not withdraw it.......just remember where the screw access holes are in the bar, and drill through the plastic denture base to get to the screws, and lift out. Gerald Rudick dds Montreal, Canada

Gerald and mike are both correct. I send mine to the lab and let them retrofit. Remember the acrylic should NOT fit tight or snug to the bar. You need a little wiggle room.

Afte you make sure that the bar fits passively, you can take a custom impresssion with a custom impression tray with theough the tray screws to remove the bar and have a ideal impression of the tissue to the bar to make an over denture that fits precisely to the bar. I have the lab make a metal sub structure and check the bar to the metal sub structure in the mouth before finalizing the denture. It is also like the "Final Dress Rehersal" be for the show. Then I process and every thing fits great! I have a great lab for this. Suncoast Dental Lab in Florida 954-781-3050. Uwe is from Germany and he is a master technician. Good luck.

Make an your denture impression to include the implants or abutments (using impression copings of course); whatever the bar is seating on. Lab can pour the cast with appropriate analogs and when the denture is ready to process, remove the bar from the patient and send it to the lab. The tech can process clips into the denture directly on the bar; they can block out the bar undercuts appropriately. It will be helpful to the lab if you provide an impression of the bar from the mouth so they can determine how much room is necessary in the denture. If your coordination with the lab is good, the patient will only have to be w/o the bar for a couple of days.

Just a friendly advise, make a new overdenture. its easyer than incorporating an existing one. and will give you peace of mind. Also you dont want to get acrylic bellow the bar and get stuck... that may happen and its not nice.

I take a fixture level impression and I also take a reline impression with the healing abutments present. To do so one has to reduce the acrylic in the areas of the healing abutments. I also take a bite registration and opposing model to the lab.

Clearly, there are a variety of processes to perform the task. I would be very cautious picking these up intraorally, it just seems too likely that this will accidentally lock on. I retrofit a denture for a patient when we could no longer obtain parts for his existing connection system. I performed it as as as an open tray pick up impression using the denture as a custom tray. I had my lab perform a hard reline, at which time they picked up the casings. I confirmed the fit of the final bar, and carved out the intaglio surface. I used red wax and then Fit Checker to confirm that the denture sat passively over the bar. I replaced the posterior screws with extended impression screws, then removed the anterior screws. I cut holes is the teeth that lined up with the extended screws and then took an impresssion with a medium body poly vinyl. I removed the two extended screws, and removed the hader bar in the impression. I blocked the front screw holes with cotton, and placed implant analogs in the posterior. I sent the case to the lab and it came back the next day looking beautiful. I was sticker shocked by the lab bill, but overall it worked great, the patient was happy, I would do it again in the future (I'll charge more next time). I suddenly don't remember how I took the impression to have the bar made, probably an open tray impression with a stock metal tray.

Are you making a new denture or trying to fit an existing denture to a new bar? In any case consult with your lab. If the lab is not a big help find a new lab. This is done on a regular basis. There are several ways to do it, but dentist and lab must be in agreement and fully understand what each is doing.

Two ways to do this: 1- in the mouth, and 2- in the laboratory Anybody that has cold cured attachments or clips in the mouth has a story of when he or she locked the overdenture in the mouth and had to cut holes in it to take it out. Still, I know very good dentists that like doing it this way. If you do pick them up in the mouth, make sure you FILL ALL UNDERCUTS AND UNDER THE BAR with a stiff material that does not get dislodged easily. The other method, you still fill all undercuts and under the bar, but you take a good impression with the overdenture, send it to the lab and let them cure the attachments. then return it to you ready for delivery to the patient. Cold curing in the mouth requires more chairtime. I like the lab procedure better. Good luck!

I ran across this inquiry just today....we have a very good set of chairside instructions online at http://www.preat.com/hader_bar_chairside_instructions.htm As has been previously stated, the keys remain: a) block out all undercuts, b) use the Green Chairside Processing spacers, not the final clips. I can not stress this enough! and c) for traditional "one bar segment" cases between the canines, do NOT have the patient come into full occlusion. You do not want to compress the posterior tissue and cause the anterior of the prosthesis to cant, or rotate, taking the clips out of alignment.

Patient has implants with a metal crossbar. The lower dentures have been lost. How can I obtain the matching clip for insertion into the replacement.

Is there a way to make a cover for a metal hader bar to protect the tongue during throat surgery? Patient required two stitches from laser pressing tongue into hader bar posts during throat laser surgery.