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Ask UsHader Clip Techniques?
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Dr. Robbins asks:
I am having some problems getting a mandibular overdenture to fit the bar. The patient has 4 dental implants supporting a bar in his mandibular anterior region. I cannot get the Hader clips to seat on the bar.
I have picked up the transfer copings off the bar in an impression in
the overdenture and given it to my lab. The lab says the most accurate
way of mounting the Hader clips is to pick up the Hader clip in the
overdenture using acrylic. I am a little leary of locking the acrylic
under the bar.
Does anybody have a good and reliable technique for this?
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5 Responses to “ Hader Clip Techniques? ”
if you are careful in blocking, locking of denture should not be a problem.
But if you are really concerned about it, then your lab should be able to place clip in the denture on the model, if you take accurate impression and lab will fit the bar to analogs.
you can use light cure resin also.
If all else has failed, in other words you cannot “cold cure” the clips into place think about this…
Get some longer laboratory screws, and take an impression of the entire tissue surface encapsulating the bar. The lab screws will protrude through the denture and you will unscrew them as an “open tray technique”. Now, granted this will inevitably mess up your denture in 4 places where the screws protrude. Your lab can then reline the prosthesis directly to the bar. They will make a master cast with analogues and process directly. I would suggest the little brass housings the yellow Hader clips be used as a keeper in the acrylic. Your lab can heat process everything and “heal” the denture wounds! Again this is a last resort after setting them chairside has failed.
Setting chairside requires blocking out the bar. I have been there with getting the bar “locked in” more than once. It makes for little sweat balls upon your forhead. If you cannot pop it out you have to resort to cutting through the acrylic and finding the screws. Not a fun day for anyone. Block out with some periphery wax or silicone impression material. 4 implants with a bar is a lot to block out.
One last thought. Please make sure your bar is properly designed. Perhaps you have sections that are not parallel and have different paths of insertion. I realize this is like asking someone if there is any gas in it…but that is the first place to evaluate. Anyway good luck.
When my lab designs an overdenture we always encourage the dr to place a cast framework over the bar. The Hader housings are cast as part of the overstructure. The advantage of this is the fact that when the clips need to be replaced they are snapped in to a metal housing, not acrylic and the denture can never break. We also cast Stern Era’s, and Preci Clix attachments with cast metal housings as part of the frame. This cannot be done with Locators due to the design of the plastic female.
C’mon. Hader bars are for dinosaurs. There are better alternatives.
If multiple Hader clips are being used on this case, there is no movement in the overdenture, therefor the laboratory should process the Hader clips and their housings into the denture in the laboratory. Another possible problem that might exist is if the laboratory did not cast the bar straight in the area where the clips should grab the bar. If there is a curve in this area, the clips will never stay in.
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