Twisted File : Tip Evaluation (1st 3mm)

DETAILS:

FILE NAME: Twisted File
COMPANY: Kerr Sybron
MANUFACTURER: Kerr Sybron
MADE IN: USA
WEBSITE: kerrdental.eu.com

 

CHARACTERISTICS:

SIZE: 25/04
FLUTES: 3
SPIRALS PER 16MM: 4
HELIX ANGLE: 10º (at apical 1/3) [fig. 2]
CUTTING ANGLE: (-)30º [fig. 1]
DEBRIS REMOVING AREA: 55% [fig. 1]
ROTATION TO FAILURE: 805º
PEAK TORQUE AT FAILURE: 15.3 gf/cm
60 ̊ DEFLECTION: 1.42 g
PLASTIC DEFORMATION: 0º
FILE CORE AREA RELATIVE TO CIRCUMFERENCE AREA: 28%
FILE CORE AREA RELATIVE TO FILE X-SECTION AREA: 62%

 

DISCUSSION:

  • Unlike other files tested, the TF files are ground parallel to its long axis, along the length of its working surface. Other files are ground more perpendicular to their long axis during which the microscopic ground grooves form micro cracks that are concurrent with the cleavage planes of the metal. This significantly increases the file’s resistance to torsional failure, not to be confused with stress resistance, during performance.

    Tip SEM

    Fig. 1

    Fig. 2

     

     

     

     

     

     

     

    SEMs are provided by Dr. Franklin Garcia-Godoy, Professor and Senior Executive Associate Dean for Research Director, Bioscience Research Center University of Tennessee Health Science Center

     

K3 : Tip Evaluation (1st 3mm)

K3FullView

DETAILS:

FILE NAME: SybronEndo
COMPANY: SybronEndo
MANUFACTURER: SybronEndo
MADE IN: Mexico
WEBSITE: sybronendo.com

 

CHARACTERISTICS:

SIZE: 25/04
FLUTES: 3 (asymmetrical)
SPIRALS PER 16MM: 7
HELIX ANGLE: 31º [fig. 2]
CUTTING ANGLE: VARIES [fig. 1]
DEBRIS REMOVING AREA: 34% [fig. 1]
ROTATION TO FAILURE: 270º
PEAK TORQUE AT FAILURE: 89.87 gf/cm
60 ̊ DEFLECTION: 3.86 g
PLASTIC DEFORMATION: 0º
FILE CORE AREA RELATIVE TO CIRCUMFERENCE AREA: 66%
FILE CORE AREA RELATIVE TO FILE X-SECTION AREA: 58%

 

DISCUSSION:

  • While the K3 has excellent side cutting ability, it is one of the least flexible files. Consequently, the K3 file is best used to enlarge the coronal aspects of a canal or for preparing straighter canals.
  • The minimum rotation to failure is noticeable. However, it should be noted that a file rotating at 500 rpm will complete 3 revolutions in less than 1/4 of a second and no file we’ve tested yet has withstood 3 full rotations without separating.
  • Peak torque at failure is a more important consideration and the K3 compares favorably to other files.

 

Tip SEM

TIP SEM

Fig. 1

Fig. 2

 

 

 

 

 

 

 

 

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