1 - Which parameters should be applied to R-Motion® (angles & speed)?

R-Motion® files have been designed and can be used with standard reciprocating modes in existing motors (CCW >> CW).
FKG is launching a cordless endomotor with a preset program dedicated to R-Motion® files and an integrated apex locator: the Rooter® Universal
For more information about this new motor, please contact your local FKG dealer or consult the following link: https://www.fkg.ch/products/endodontics/motor-apex-locator/rooter-universal

2 - Can I use R-Motion® files on OTR (Optimum Torque Reverse) motion?

OTR motion is not recommended by FKG for the use of R-Motion® files.


3 - What is the metallurgy of R-Motion® and how does it affect the treatment?

All R-Motion® instruments are made of a medical grade NiTi alloy. The active part of the instrument undergoes a proprietary heat treatment that triggers a phase transition (between martensite and austenite) just below body temperature, between 32° and 35°C.


4 - Does R-Motion® have constant or variable taper ?

  • R-Motion® Glider has a taper of 3% from the tip to 9mm, then 6%.
  • R-Motion® shaping files have a constant taper.


5 - Which cross section for R-Motion®?

Rounded triangular symmetrical cross-section in all instruments.


6 - Is R-Motion® recommended for retreatment?

R-Motion® has not been validated for retreatment cases and therefore cannot be recommended for this indication.
FKG recommends using its existing dedicated systems: XP-endo Retreatment or D-Race.




1 - What is the metallurgy of RACE® EVO and how does it affect the treatment?

All RACE® EVO instruments are made of a medical grade NiTi alloy. The active part of the instrument undergoes a proprietary heat treatment that triggers a phase transition (between martensite and austenite) just below body temperature, between 32°and 35°C.


2 - What is the impact of this new metallurgy on the cutting efficiency of RACE® EVO 4% sequence and RACE® EVO 6% sequence instruments?

The heat treatment does not have a direct influence on the cutting efficiency, it is rather the legacy RaCe design associated with the higher rotation speed (1’000 rpm) that improves the cutting efficiency, by up to 50% compared to former RaCe product lines.


3 - What are the resistance to cyclic fatigue and torsional resistance of RACE® EVO 4% sequence and RACE® EVO 6% sequence instruments?

RACE® EVO 4% sequence and RACE® EVO 6% sequence instruments show up to 2.8 times higher resistance to cyclic fatigue and up to 1.9 times higher resistance to torsion.


4 - Why is RACE® EVO designed with a safety tip rather than with a booster or active tip?

RACE® EVO’s unique rounded safety tip allows for an efficient progression of the instrument along the canal.


5 - Why is it not necessary to have an intermediate file between the rotary glide path file (15/.04) and the initial shaping file (25/.04)?

Thanks to the combination of heat treatment, design and higher speed, an intermediate file is not necessary. You will be convinced when you try it !


6 - How many root canals can I treat with a RACE® EVO instrument?

With any RACE® EVO instrument you can treat up to a maximum of 8 root canals. However, you still need to inspect the RACE® EVO instrument on a regular basis during use, and change if it shows any signs of deformation (for example: straightening). The good news is that RACE® EVO instruments, once they have reached the end of their service life, will deform in a visible way before they fracture. This warning is an additional safety feature specific to these instruments.


7 - Without SMD (SafetyMemoDisc), how can I know how many canals I treated?

SMD is not needed because RACE® EVO instruments show sufficient resistance to fatigue to guarantee a maximum use of 8 canals, no matter how difficult the curvatures are. However, if you feel more confident with SMD, they are still available separately in the FKG product assortment.


8 - Is there any risk if I use RACE® EVO instruments over 1’000 rpm?

To achieve full efficiency of RACE® EVO instruments, FKG recommends a speed of use between 800 and (ideally) 1'000 rpm. FKG cannot recommend the use of RACE® EVO instruments at higher or lower speeds.


9 - Is RACE® EVO recommended for retreatment?

RACE® EVO has not been validated for retreatment cases and therefore cannot be recommended for this indication. FKG recommends using its existing dedicated systems: XP-endo Retreatment or D-Race.



XP-endo Instruments

1 - Why do the XP-endo® files act differently at room vs. Body temperature?

MaxWire® alloy was specifically designed for XP-endo® instruments.

Like all Ni-Ti files, XP-endo® instruments have two phases:

  • A martensitic phase (M-phase) in which the instrument is malleable and can be manipulated into any shape.
  • An austenitic phase (A-phase) in which the instrument is superelastic and will always return to its original shape upon deformation. In this phase, the file cuts dentine more efficiently.

XP-endo® instruments are factory designed to be in the martensitic phase at 20°C (room temperature) and to turn into the austenitic phase at body temperature.


2 - How can a file have more than one taper?

The XP-endo® Shaper has an ISO diameter of 0.30 mm and the taper of the metal core is 1%. It comes out of its package at room temperature in the M-phase and can be deformed.

When the temperature increases above body temperature, the instrument moves into the A-phase and expands to its characteristic serpentine shape. When the instrument is spinning, its coils produce an 8% taper shape (outside of the canal).

What is described above occurs when the instrument is free, without resistance to its expansion. In the canal however, the instrument will be initially constrained by the dentin walls and then, by cutting the dentin it will slowly expand to attempt to get to its potential 8% capacity.

This means that the taper the instrument achieves will be time dependent. Generally, it will reach a 4% taper after 13 to 15 long strokes to working length inside of the canal. A lesser or larger taper can be achieved by varying the time that the XP-endo® instrument is used. 


3 - How do I get my working length?

The working length is determined similarly as done with a traditional file. When the XP-endo® instrument is inserted into the root canal, it is compressed between the dentine walls, meaning that the file gets straighter and thus tends to be at its maximum length.

However, as the canal gets larger, the instrument expands and its reach slightly shortens.

Overall, determining the working length is very similar to when using a straight file!


4 - What is the difference between XP-endo® Shaper and XP-endo® Finisher?

  • The XP-endo® Shaper is designed to cut a specific shape in the canal that involves removal of dentin. On the other hand the XP-endo® Finisher does not cut or shape dentin. It rather scrapes biofilm and attached debris from the canal wall without changing the shape of the canal at all.
  • The XP-endo® Shaper has a lower expansion capacity compared to the XP-endo® Finisher. Compared with standard instruments of the same size, the XP-endo® instruments have the ability to increase their reach volume by 3 to 7-fold for the XP-endo® Shaper and up to 100-fold for the XP-endo® Finisher.

Thus, the XP-endo® Finisher can reach areas that the XP-endo® Shaper cannot reach particularly irregularities such as resorptive defects or natural indentations inside the canal.


5 - Do we need a XP-endo® Finisher, if the XP-endo® Shaper does the job?

There will be cases where the 3 to 7 times expansion capacity of the XP-endo® Shaper will be adequate to clean a canal effectively. However, we have no way of identifying these cases clinically since we do not see the bucco-lingual dimension on the radiograph.

Using the XP-endo® Finisher after each canal shaping, allows mechanized cleaning in areas previously impossible to reach, irrespective of bucco-lingual dimension, presence of indentations, and/or possible resorptive defects. 


6 - Why do we need the XP-endo® Shaper? 

Since the XP-endo® Finisher has a core size of 25/.00 it requires a size of at least ISO 25 in order to eliminate the chance that the tip will lock. Any file system can be used to achieve the required size 25.

However, the advantages of using the XP-endo® Shaper in order to achieve this size are the following:

  • It replaces a complete sequence of instruments. Indeed, after a 15/.02 glide path is achieved, the XP-endo® Shaper requires only a dozen up and down strokes, over the entire working length, to reach the minimum wanted size.
  • The serpentine shape of the XP-endo® Shaper, its flexibility and resistance to cyclic fatigue due to a 1% metal core and its expansion into areas where resistance is low, makes this file adaptive to the natural anatomy of the canal. Thus, the natural shape of the canal is respected even though dentin is removed. Full core files machine an artificial shape into the canal weakening the root in some areas while being inefficient at cleaning.
  • The thin metal core and serpentine shape further contribute to cleaning by creating turbulence within the irrigant volume, thus enhancing the antibacterial effect and removal of dentinal debris.


7 - What is the part of XP-endo® Shaper that cuts the dentine? Does the XP-endo® Finisher work in the same way? 

Both XP-endo® Shaper and XP-endo® Finisher have triangular cross-sections.

The external part of the coil of the XP-endo® Shaper cuts, whereas the XP-endo® Finisher scrapes the dentine.

The cutting capacity of the XP-endo® Shaper is due to its bigger ISO size (0.30) and taper (0.01). Also the “serpentine” shape, with its numerous coils, increases its cutting efficiency.

The XP-endo® Shaper cuts the dentine, while respecting the original morphology of the canal and does not generate round shapes because of its serpentine shape that is not aggressive.

On the contrary, the XP-endo® Finisher has practically no cutting capacity. This is due to its smaller ISO size (0.25) and taper (0.00). The «sickle» shape, with its unique big bulb, generates a slight scraping action. It contacts the canal walls and removes the debris, the biofilm and the smear-layer. It goes into soft tissues and in areas where there is no resistance.


8 - When I take the XP-endo® Shaper out of the canal, it looks like it has lost its ability to expand? 

We need to remember that when the XP-endo® Shaper is placed into the canal it is squeezed into a narrower space, and it needs time to overcome the resistance of the dentine and fully expand to its austenite shape.

When we remove the instrument from the canal, it is in the squeezed shape and returns to room temperature and so it will stay in that shape.

The only way to really know if it has completely lost its ability to expand is to place the instrument in 37°C or above (e.g. warm water). If it fails to regain its serpentine shape, it should be discarded.


Rooter Universal

1 - How many free memories can I set parameters on my Rooter® Universal?

The device contains two user created file systems: “Rotary File” and “Recipro File
Rotary File:   4 programmable free memories are available.
Recipro File:   1 programmable free memory is available.


2 - Can I connect an external apex locator to my Rooter® Universal?

The Rooter® Universal has an embedded apex locator.


3 - Can I adjust the volume of the beeper?

No, the volume of the beeper can’t be adjusted.


4 - What is the weight of the handpiece with contra-angle?

The weight of the handpiece and contra-angle is 150 grams. If used with the lighting device, please allow a few extra grams.


5 - What is the technology of the mini-motor integrated in the Rooter® Universal?

It is a DC motor.


6 - Does the Rooter® Universal have an “Automatic Power Off” function? And can I change its settings?

In stand-by state, the device automatically turns OFF after 3 minutes. This parameter can’t be changed.


7 - How long does it takes to fully-charge my Rooter® Universal?

The required time to fully charge the Rooter® Universal is ~ 120 minutes.


8 - When fully charged, how long can I use the unit?

Time may vary depending on the usage. The battery capacity is 1200mAh.


9 - How much time of work is left when only one bar is shown on the Rooter® Universal battery indicator?

It depends on the usage; it is recommended to charge the handpiece when it reaches the last bar of the battery charge level indicator.


10 - What technological generation is the apex locator?

The Rooter® Universal embeds a 6th generation apex locator.


11 - Does the Rooter® Universal has an “Apical Auto Reverse” function?

Yes, when the file reaches the apex position set by the user, the motor will automatically rotate in the reverse direction.


12 - What are the features of the original contra-angle?

It is a 16:1 contra-angle offering 360° rotation.


13 - Can I use another contra-angle than the original one?

FKG Dentaire SA does not recommend to use of other contra-angle with the Rooter® Universal endo motor than genuine ones.


14 - How do I clean, disinfect and sterilize the Rooter® Universal components?

Please consult the user manual for any questions relating to cleaning, disinfection and sterilization of the Rooter® Universal components.


Speed & Torque - Recommendations

CI metal handle - Color codes

FKG rotary instruments are equipped with a CI metal handle, depth marks and a silicon endo stop.

The aim is to provide easy identification of the ISO diameter (wide ring) and taper (narrow ring). The information remains visible when the instrument is inserted in the head of the contra-angle.


Color codes


CI metal handles - Depth marks

The depth marks are used to recognise the position of the working length (WL) in the tooth and are additional to the endo stop. The depth marks are applied on all instruments in the XP-endo and Race ranges.

  • Depth marks applied on instruments of length 21 mm/25 mm/31 mm


  • Examples of instruments with depth marks:



CM metal handles

The colour ring on the handle indicates the ISO diameter and the SafetyMemoDiscs (SMD) specify the taper of the instruments. 


Silicone endo stop

The endo stop is used to mark the working length, it is radiopaque:

  • The stroke identifies the original tip direction in the root canal (SSt instruments).

  • ISO Colours indicate the file length.


Race - Golden rules for optimal use of Race instruments

  • Speed: 600-1000 rpm - torque: 0.5 to 1.5 Ncm, depending on instruments see details.
  • Broad back and forth movements without using force.
  • Light hand, let the instrument do the work.
  • Work for 3-4 seconds, remove.
  • Clean the blade and irrigate the canal.

Race - How many times can a Race be used?

The following are the instructions for the SafetyMemoDisc:

  • 1 petal corresponds to simple cases, that is, straight, slightly curved or wide canals.
  • 2 petals correspond to moderately complex cases, that is, more curved or narrow canals.
  • 4 petals correspond to complex cases, that is, canals with extreme curvature or S-shaped, very narrow or calcified canals.

Although Race instruments can be sterilized and reused several times, it is recommended to use them according to the “single patient” principle to avoid the risk of cross-contamination.