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Endodontic hand files

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endodontic hand files like k-files k-flex

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Endodontic hand files

  1. 1. ENDODONTIC HAND FILES Presented by- HEMAM SHANKAR SINGH
  2. 2. Contents: U*. e.= -.* introduction . Standardization of endodontic instruments Classification Hand operated files . Conclusion
  3. 3. Introduction: 3 Endodontic hand files are manually operated endodontic instruments used for cleaning and shaping of root canals in root canal therapy or any other endodontic procedures. At one time, root canal instruments were made according to the whim of manufacturers, with no definite specifications regarding diameter, taper, or length of the cutting blades. lngle and L. e.Vin. e, were the first to suggest a definite increment in diameter as the size progressed while maintaining a constant taper of all blades regardless of size.
  4. 4. Standardization of endodontic instruments: 1. NUMBER: 1. instruments should be numbered from 10-100 ii. numbers to advance by 5 units from 10-60 size iii. numbers to advance by 10 units from 60-100 size iv. In a revised number, it includes 6-140 where numbers are advance by 2 units from 6-10 2. DIAMETER: each numbers shall be representative of diameter of instrument in hundredths of a millimeter at the tip. Eg. No. 10 is 10/100 or 0.1mm at the tip
  5. 5. Standardization of endodontic instruments: 3. WORKING BLADE: Shall begin at the tip, designated as Do , shall extend exactly 16mm up the shaft, terminating at designated site D16 4. D, AND D“: D16 diameter shall be 32/100 or 0.32 mm greater than that of D 0 5. TIP ANGLE: Shall be 75:15” 6. HANDLE COLOUR: 0 Instrument handles are color coded for easier recognition
  6. 6. Standardization of endodontic instruments: 6
  7. 7. Standardization of endodontic instruments: Significant changes: - Stainless steel and nickel-titanium root canal instruments have replaced carbon steel instruments because they are - more flexible - Less likely to fracture - Less susceptible to corrosion - Small instruments are manufactured from square blanks - Are more resistant to torque fractures - Large instruments from triangular blocks - To improve their cutting efficiency
  8. 8. Standardization of endodontic instruments: Pink Gray Purple White Yellow Red Blue Green Black 6 8 10 15 0.06 0.08 0.10 0.15 0.20 0.25 0.30 0.35 0.40 diameter 0.38 0.40 0.42 0.47 0.52 0.57 0.62 0.67 0.72
  9. 9. I war :1’. : : »: -: v1ae: «' = s’. l:i'-: .:: . At tip At 16mm White 45 0.45 0.77 Yellow 50 0. 50 0.82 Red 55 0.55 0.87 Blue 60 0.60 0.92 Green 70 0.70 1.02 Black so 0.80 1.12
  10. 10. Standardization of endodontic instruments: New number 0 White 9 0.90 1.22 Yellow 100 1.00 1.32 Red 110 1.10 1.42 Blue 120 1.20 1.52 Green 130 1.30 1.62 ‘ Black 140 1.40 1.72 White 150 1.50 1.82
  11. 11. Classification: General classification of endodontic instruments: - Group I: Hand-operated endodontic instruments - Broaches - Files - Reamers - Group II: Non-rotary endodontic instruments used with a handpiece - Engine driven instruments - Ultrasonic and sonic instruments - Group III: Rotary endodontic instruments used with a handpiece 11
  12. 12. Hand operated files: Some of the hand operated files are 1. K-type files K-flex files Flex-R file Iieclstroern/ H-files Safety Hedstroem I: Iy. tlex__ file lJ. .n. i.fil, es. S-files 9°. “?‘E-": “E*’! "‘ 12
  13. 13. Hand operated files: 13 flmfles - In early 1990’s, Kerr Manufacturing company - Used with rasping or pulling motion - Traditional files are square in cross section - Have tighter flutes compare to reamers which have looser flutes - Files have more numbers of flute than reamer
  14. 14. Hand operated files: 14 K-flex files Flex-R file - Modification of K-file - Modification of K-file - Rhomboidal or diamond shaped - Cutting tip angles are reduced - Increases flexibility and cutting - It makes the file stayed more efficiency centered within the canal - Rhomboidal blanks produce alternating high and low flutes
  15. 15. Hand operated files: 15 Hedstroeml H—files - Round stainless steel wire - Have higher cutting efficiency than K—files (more +ye rake angle) - Should employ only in one direction, (retraction) and never torqueing - “Tear drop” cross section
  16. 16. Hand operated files: Safety Hedstroem - Modification of Hedstroem - With non cutting side Unifiles. - Round stainless steel wire with cut out superficial grooves to produce flutes in a double-helix design - Less subjected to fracture but are less effective 16 Iiyflex, fi les - Cross section represents “S” shaped S—file - Double helix cross section and is a variation of Unifiles
  17. 17. Conclusion: Hand operated endodontic files may be time consuming but it is wise to use hand files as well because of good tactile sensation required during the cleaning and shaping of root canal. It also reduces the excessive widening of root canal that might weaken the tooth. 17

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