BMP INSTRUMENTS

K FILES
1. All files are made of SS
2. Twisting a blank that is a Square cross section
3. More +ve rake angle
4. High no. of flutes per mm length
5. Therefore less cutting efficiency- least aggressive.
6. But high fracture resistance, strongest of all files
7. Used for – orifice locating , pulp extirpation
8. Technique – push inside & pull outside in clockwise-anticlockwise motion
9. Can use filing and reaming action.
10. To remove hard tissue in canal enlargement.
11. 1st instrument to introduce in the canal

K REAMERS
 Twisting Triangle cross section rod
 -ve rake angle
 Better cutting efficiency than K file
 Technique – push, rotate only to one side, pull motion
 Can use only reaming motion-repeated clockwise motion
 To shave dentine & to enlarge canals
 Flexible files

H FILES
 Not twisting, but by using a sharp rotating cutter to create triangular segments out of a Round cross section blank.
 +ve rake angle
 Less no. of flutes per mm length
 Very sharp edges
 Therefore high cutting efficiency
 Poor fracture resistance
 Use carefully with filing action only=push-pull action

GATES GLIDDEN DRILL
 Long shaft- short cutting head- side cutting surface with safety tip.
 Tip diameter = 0.5-1.5
50 – 150 size K file
 For enlarging coronal 1/3rd of canal
 Coronal enlargement –50 size
 GG#1 FILE LENGTH – 20mm*
 Removes lingual shoulder

FILE SIZE EXPALANTION
6 8 10 Difference is 2
10 – 60 Difference is 5
60 – 130 Difference is 10

STANDARDIZATION OF INSTRUMENT IS- Width Tip
Diameter,
Do = file size / 100 I.e. One by hundredth of the file no.

PROTAPERS
Sx – S1 – S2 – F1 – F2 – F3
Triangular cross-section
Orange-Purple-White-Yellow-Red-Blue
DR.MAYAKHA MARIAM;THE GULFIE DENTIST 27
Engine driven files use only reaming action