The Laschal FXP set incorporates transferred oscillation technology


There are other ultrasonic devices on the market that depend upon direct contact with a separated file to loosen and remove. However, it is absolutely impossible to restrict the contact of the tip to the file remnant itself. The vibrations will cause the ultrasonic tip to “wander” circumferentially around the file while always resulting in direct contact with the canal wall. It has been reported that as little as 12-15 seconds of direct ultrasonic contact with the canal wall will cause tissue and bone degeneration secondary to the heat and ultrasonic waves. The transferred oscillation technology of the Laschal FXP probes completely eliminates heat buildup and greatly buffers the ultrasonic waves upon the canal walls.


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Method of using the file extraction probes

Insert the probe along the wall of the canal with a slight pressure that allows the probe to flex up against the canal wall, and allow the flexible, flat prong to follow the wall to the junction of tip of the broken file and wall of the canal. There, the probe is wedged into the junction. The tip of the vibratory or ultrasonic device is then placed and stabilized in the hole of the probe just distal to the flattened portion and activated. The probe is extremely thin, light, and flexible and allows the vibrations of the ultrasonic or vibratory device to be readily transferred through the probe to its tip and into the junction of the wall of the canal and file remnant. 

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Two separate and distinct actions ensue:         

a) On the side of the wall of the canal, the combination of the abrasive and transferred vibrations cause an abrasion or “wearing away” of the dentinal wall of the canal, creating a trough between the file and the wall of the canal.

b) On the side of the broken file, the diamond-dusted prong relieves the sharp flutes while creating a micro-mechanical retention between the [dulled] flutes of the broken file and the probe, thereby increasing the trough between the canal wall and the remnant. The vibrations then cause a further loosening of the file from the wall of the canal itself.

The use protocol:

  1. The probe is pushed into the junction of the canal wall and file fragment.
  2. Once stabilized, the probe is tightly held in place.
  3. While the probe is tightly held in place with one hand, the ultrasonic device is then pushed tightly into the hole with the other hand, as pictured, and activated.
  4. With the probe tip tightly held in the junction of the canal wall and the file remnant in one hand and the ultrasonic tip held firmly in the other hand, slight up/down coordinated movements of both hands cause the probe tip to start to loosen and elevate the file remnant. When there is a slight movement of the file remnant on the one side, use a different angled probe to access the opposite side, and repeat the process. 
  5. Continued repetition of the process [first one side then the other], loosens and elevates the  file remnant until it can be easily grasped with the Laschal Stieglitz Forceps and removed.


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