Unscrew the Transfer Coping Screw?

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Thomas, a dentist, asks:

I torqued a transfer impression coping to 20 Ncm as per directions from the dental implant manufacturer. The transfer coping screw had an internal hex in its head. After making my impression index, I attempted to unscrew the transfer coping screw. The angles of the internal hex rounded off and I could not engage the internal hex with the torque wrench. Has this ever happened to anybody? What did you do to get it out?

 

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10 Responses to “ Unscrew the Transfer Coping Screw? ”

• Dr m c February 20th, 2007

  
  

  I managed to round off the internal shape of a Straumann healing cap, about 8 years ago. I solved it by very carefully cutting a screw head shape into the remaining metal and then using a watchmaker’s screwdriver to remove the cap.

  You possibly need to combine your skills and thinking with that of an engineer who has snapped off a stud in an engine block.

• Marc A. Cohen February 20th, 2007

  
  

  Make sure it is not your hex driver that has rounded off. I have replaced a number of drivers due to rounding of the hex but never had an impression coping screw rounded out. Try a new driver to verify this.

• Lee Baker February 20th, 2007

  
  

  I once rounded off the internal hex of an abutement when I was removing a porcelain/metal crown from the implant abutement. (Diamond too close to the hex). Most implant vendors have a ‘easy-out’ type of instrument very similiar to what mechanics/plumbers/etc use to remove broken screws. Basically, it’s a left hand thread that engages the stipped hex when you turn the wrench counter-clockwise. Works like a charm. About fifty bucks.

  Per the above post, also check your driver first.

• dr.Stangegaard DK February 20th, 2007

  
  

  Try an new sharp rosenbur in slow but high torque in a reversed mode, it will often do the trick.

• piezo1 February 21st, 2007

  
  

  It happened to me two days ago!
  I managed to cut the head of the transfer with a diamond bur, leaving intact the internal screw.
  Then, with a universal clamp, i could easily unscrew the transfer.

• Dennis February 21st, 2007

  
  

  Isn’t it unusual to torque an impression coping/transfer screw to 20Ncm?
  The information I pass on to my accounts (also from the implant manufacturers) is to secure the screw with finger pressure only.
  The various solutions posted are well worth remembering and I will pass those on as needed.

• Dale February 21st, 2007

  
  

  I agree. I would never torque an impression pin. It is not necessary. Secondly, Hex drivers are not all a like. Some only have a milimeter of hex, others 2mm of hex. Off brands usually are smaller and do not fully engage the female screw hex.

• Dale February 27th, 2007

  
  

  Lee, I have also used the “easy out” they do work in most situations.

• Jim Sylvester February 28th, 2007

  
  

  The rosenbur idea sounds interesting. What is a rosenbur, anyway?

• ira dickerman, cdt October 19th, 2007

  
  

  Just to be sure not to overlook the obvious, the Straumann System uses a Straumann SCS Driver. It may seem compatible with an .048 internal hex driver but it is not. It is also not compatible with Nobel Replace Select system

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Thu August 07 2008

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