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Liberator™

Features & Benefits
FAQ's
Product Information
Technique
Video
Literature

 

Features & Benefits

Rotary NiTi problems: File Separation, Complicated Techniques

Here's why Liberator™ is the safe, efficient and easy solution:

  1. Straight-flute design cannot self-thread
  2. Lack of radial land areas reduces friction
  3. Higher RPM reduces torque forces
  4. Roane safety tip keeps file centered
  5. Efficient removal of dentin
  6. Manufacturing process eliminates transverse micro-cracks

1. Straight-flute design cannot self-thread
Several studies have shown that self-threading is a precursor to file separation. Since most rotary endodontic instruments are helically-fluted- like a wood screw - they have a natural tendency to self-thread.  Liberator™ rotary NiTi file is a straight-fluted instrument.  In a controlled study, Liberator™ demonstrated 0% self-threading:


Self-Thread study using acrylic blocks in controlled apparatus. N=20.
Profile and K3 are not trademarks of Miltex, Inc.

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2. Lack of radial land areas reduces friction


Radial Land
Conventional File

Radial land areas are required for conventional helically-fluted files because they prevent the file from over-engagement in the canal (see file cross-section at left). If a file becomes suddenly engaged or self-threaded, it may fracture.

Radial lands are especially important for files that have positive rake angles.  That is, the angle of attack of the cutting blade is similar to a snow plow - which is forced downward toward the surface of the pavement....resulting in friction and sparks!


No Radial Lands
Liberator File

Liberator™ rotary files have no land areas.  The only friction is the file abrading tooth structure.

 

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3. Higher RPM reduces torque forces
Why do Liberator™ instruments operate at RPMs of 1,000 to 2,000?  Because they can without self-threading!  High RPM offers the benefit of lower torque.  Torque is the twisting force that causes file separation.

Electric motors offer the horsepower required to drive an endodontic file, which is typically referred to as electric motor load. The most common equation for power based electric motors on torque and rotational speed is: hp = (torque X rpm)/5,250.1  More information on how this formula is derived, visit http://www.revsearch.com/dynamometer/torque_vs_horsepower.html

 Here is the same equation that defines torque:  Torque = (HP X 5252)/RPM
For example, as RPM is increased from 350 to 2,000, torque is decreased by a factor of 5.7!

The machine tool industry has advanced the concept of using reamers at high RPM.  These instruments are used when placement of pins require a smooth finish at very accurate tolerances. 

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4. Roane safety tip keeps file centered

Dr. James Roane developed the Roane safety tip that minimizes ledging and transportation.  It also helps center the file in the canal.  This tip design is used on all Liberator™ NiTi rotary file as shown at right.

Proven: The Roane safety tip has been used for Flex-R® hand files for the past 15+ years.

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5. Efficient removal of dentin

Liberator™ NiTi rotary files quickly remove dentin because of their sharp cutting blades moving at high velocity.  In endodontics, the amount of work required to remove dentin can be expressed as kinetic energy.  Using a proven formula for kinetic energy (KE), we can show how Liberator files deliver significantly higher KE:
 
Formula1 Liberator File: 2,000 RPM Conventional Rotary: 350 RPM
KE=1/2 X MV2 KE=1/2 X M(2,000)2  or KE=1/2 X M(350)2  or
  KE=1/2 X M(4,000,000) KE=1/2 X M(122,500)

Liberator delivers 32 times* more KE!

1 http://hyperphysics.phy-astr.gsu.edu/hbase/rke.html
http://jersey.uoregon.edu/vlab/PotentialEnergy/
* 4,000,000 / 122,500 = 32

  

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6. Manufacturing process eliminates transverse micro-cracks
Liberator™ rotary NiTi files are manufactured with a unique patent-pending process using electro-chemical grinding (ECG) techniques.  This process employs a liquid chemical that decreases the thermal impact of the grinding process.  In contrast, high surface temperatures are achieved with conventional processes that result in heat affected zones on the file.  These heat affected zones impact the surface hardness (brittleness) and may impact the potential for file separation.

The direction of the grinding wheel for Liberator™ files is parallel with the axis of the file.  This compares to conventional files where the grinding wheel is perpendicular to the file axis - resulting in transverse micro-cracks.  These micro-cracks have been attributed to file separation.

Liberator™ File
Parallel Grinding Pattern
Vertical tool marks		 Conventional File
Transverse Grinding Pattern
Horizontal micro-cracks may be a source of file separation in curved canal		  

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FAQ's

Below is a list of commonly asked questions regarding the Liberator™ file.
  1. What is different about Liberator™ files?
    Miltex Liberator™ NiTi rotary file is a non-helical flute design, meaning it does not have the “spiral” appearance of existing rotary NiTi files on the market. Liberator is a patent pending design that incorporates straight flutes. Straight flute reamers have been used in the machine industry for many years.
  2. Why is Liberator™ better than a helically-fluted file?
    Helically-fluted files—regardless of design—all have a tendency to self-thread into canals, which can be a precursor to file separation. Since the Liberator™ file has straight flutes, it is impossible for it to self-thread. As a result, Liberator™ can be operated at up to 2,000 RPM. This higher speed (vs. conventional files operating at 350RPM) reduces torque forces.
  3. How does Liberator™ remove debris?
    Due to relatively high RPM, the abrasion of dentin results in very fine debris particles. This debris clings to the file and is easily removed by wiping. The file will not clog, unlike helically-fluted files. Normal irrigation is important to remove residual debris, irregardless of the file system.
  4. What operating speed is recommended for the Liberator™ file?
    The Liberator™ files are specified to operate at 1,500 to 2,000RPM, however, .04 and .06 tapered instruments may be run as low as 1,000RPM.
  5. Is a torque control motor necessary for use with the Liberator™ file?
    Due to the safety and control that the Liberator™ file provides, torque control is not necessary.
  6. Is the Liberator™ a technique specific file, or can it be used in existing techniques?
    The Liberator™ file can be used for any technique.
  7. What are the #1, 2, and 3 Roane Gates Glidden (RGG) drills?
    The #1, 2, and 3 RGGs are modified gates glidden drills made from nickel-titanium which incorporate the straight flute design. The three files are designed to be used together to give a consistent .08 taper in the coronal third of the canal.
  8. What sizes are available?
    The Liberator™ files are available in a complete line of .02, .04, and .06 tapers. Coronal Shapers are also available.  See Product Information.
  9. How can I order the Liberator™ file?
    The Liberator™ can be ordered through an authorized Miltex distributor.
  10. How many times can the Liberator™ files be used?
    Nickel-titanium files are specified for single use. However, the RGG #1 and #2 can be used multiple times.
  11. What type of manufacturing process is used to make the Liberator™?
    The Liberator™ file is manufactured from a patent pending process that eliminates transverse micro-cracks that are present in traditional helically-fluted file manufacturing. These micro-cracks can lead to file separation.
  

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Product Information

Part Number

Description

 Length

Tip

Taper

Apical Shaping Files

012-28001

Liberator Rotary File 15/02 21mm

 21mm

15

0.02
012-28002 Liberator Rotary File 20/02 21mm 21mm 20 0.02
012-28003 Liberator Rotary File 25/02 21mm 21mm 25 0.02
012-28004 Liberator Rotary File 30/02 21mm 21mm 30 0.02
012-28005 Liberator Rotary File 35/02 21mm 21mm 35 0.02
012-28006 Liberator Rotary File 40/02 21mm 21mm 40 0.02
012-28007 Liberator Rotary File 15-40/02 21mm 21mm 15-40 0.02
012-28008 Liberator Rotary File 45/02 21mm 21mm 45 0.02
012-28009 Liberator Rotary File 50/02 21mm 21mm 50 0.02
012-28010 Liberator Rotary File 55/02 21mm 21mm 55 0.02
012-28011 Liberator Rotary File 60/02 21mm 21mm 60 0.02
012-28012 Liberator Rotary File 70/02 21mm 21mm 70 0.02
012-28013 Liberator Rotary File 80/02 21mm 21mm 80 0.02
012-28014 Liberator Rotary File 45-80/02 21mm 21mm 45-80 0.02
012-28101 Liberator Rotary File 15/04 21mm 21mm 15 0.04
012-28102 Liberator Rotary File 20/04 21mm 21mm 20 0.04
012-28103 Liberator Rotary File 25/04 21mm 21mm 25 0.04
012-28104 Liberator Rotary File 30/04 21mm 21mm 30 0.04
012-28105 Liberator Rotary File 35/04 21mm 21mm 35 0.04
012-28106 Liberator Rotary File 40/04 21mm 21mm 40 0.04
012-28107 Liberator Rotary File 15-40/04 21mm 21mm 15-40 0.04
012-28108 Liberator Rotary File 45/04 21mm 21mm 45 0.04
012-28109 Liberator Rotary File 50/04 21mm 21mm 50 0.04
012-28110 Liberator Rotary File 60/04 21mm 21mm 60 0.04
012-28111 Liberator Rotary File 70/04 21mm 21mm 70 0.04
012-28201 Liberator Rotary File 15/06 21mm 21mm 15 0.06
012-28202 Liberator Rotary File 20/06 21mm 21mm 20 0.06
012-28203 Liberator Rotary File 25/06 21mm 21mm 25 0.06
012-28204 Liberator Rotary File 30/06 21mm 21mm 30 0.06
012-28205 Liberator Rotary File 35/06 21mm 21mm 35 0.06
012-28206 Liberator Rotary File 40/06 21mm 21mm 40 0.06

012-28207

Liberator Rotary File 15-40/06 21mm

 21mm

15-40

0.06
012-28208 Liberator Rotary File 45/06 21mm 21mm 45 0.06
012-28209 Liberator Rotary File 50/06 21mm 21mm 50 0.06

012-28210

Liberator Rotary File 60/06 21mm

 21mm

60

0.06

012-28211

Liberator Rotary File 70/06 21mm

 21mm

70

0.06
012-28015 Liberator Rotary File 15/02 25mm 25mm 15 0.02
012-28016 Liberator Rotary File 20/02 25mm 25mm 20 0.02
012-28017 Liberator Rotary File 25/02 25mm 25mm 25 0.02
012-28018 Liberator Rotary File 30/02 25mm 25mm 30 0.02
012-28019 Liberator Rotary File 35/02 25mm 25mm 35 0.02
012-28020 Liberator Rotary File 40/02 25mm 25mm 40 0.02
012-28021 Liberator Rotary File 15-40/02 25mm 25mm 15-40 0.02
012-28022 Liberator Rotary File 45/02 25mm 25mm 45 0.02
012-28023 Liberator Rotary File 50/02 25mm 25mm 50 0.02
012-28024 Liberator Rotary File 55/02 25mm 25mm 55 0.02
012-28025 Liberator Rotary File 60/02 25mm 25mm 60 0.02
012-28026 Liberator Rotary File 70/02 25mm 25mm 70 0.02
012-28027 Liberator Rotary File 80/02 25mm 25mm 80 0.02
012-28028 Liberator Rotary File 45-80/02 25mm 25mm 45-80 0.02
012-28112 Liberator Rotary File 15/04 25mm 25mm 15 0.04
012-28113 Liberator Rotary File 20/04 25mm 25mm 20 0.04
012-28114 Liberator Rotary File 25/04 25mm 25mm 25 0.04
012-28115 Liberator Rotary File 30/04 25mm 25mm 30 0.04
012-28116 Liberator Rotary File 35/04 25mm 25mm 35 0.04
012-28117 Liberator Rotary File 40/04 25mm 25mm 40 0.04
012-28118 Liberator Rotary File 15-40/04 25mm 25mm 15-40 0.04
012-28119 Liberator Rotary File 45/04 25mm 25mm 45 0.04
012-28212 Liberator Rotary File 15/06 25mm 25mm 15 0.06
012-28213 Liberator Rotary File 20/06 25mm 25mm 20 0.06
012-28214 Liberator Rotary File 25/06 25mm 25mm 25 0.06
012-28215 Liberator Rotary File 30/06 25mm 25mm 30 0.06
012-28216 Liberator Rotary File 35/06 25mm 25mm 35 0.06
012-28217 Liberator Rotary File 40/06 25mm 25mm 40 0.06
012-28218 Liberator Rotary File 15-40/06 25mm 25mm 15-40 0.06

012-28219

Liberator Rotary File 45/06 25mm

 25mm

45

0.06

Roane Gates-Glidden (RGG) Drills

012-28401

Liberator RGG#1 118/08 13mm

 13mm

118

0.08

012-28402

Liberator RGG#2 94/08 16mm

 16mm

 94

 0.08

012-28403

Liberator RGG#3 70/08 19mm

 19mm

70

0.08

012-28405

Liberator RGG #1,#2,#3 Assorted

 Asst

70-118

0.08

Coronal Shapers
012-28301 Liberator File 20/05 19mm 19mm 20 0.05
012-28302 Liberator File 30/06 19mm 19mm 30 0.06
012-28303 Liberator File 40/06 19mm 19mm 40 0.06
012-28304 Liberator File 25/08 19mm 19mm 25 0.08
012-28305 Liberator File 60/08 19mm 19mm 60 0.08
012-28306 Liberator File 80/08 19mm 19mm 80 0.08
012-28307 Liberator File 25/10 19mm 19mm 25 0.10

Introductory Pack and Kits
012-28450 Liberator Introductory Pack Click for Details  

012-28050

Liberator .02 Taper Procedure Kit

Click of Details

 

012-28451

Liberator Variable Tip/Taper Kit

Click for Details

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Technique

You may use Liberator™ files with your current technique, or follow the techniques provided on the attached guide.

DENT-LIBTECH

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Video

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Literature