dr.linda maher. hand cutting instruments are used for cutting or removal of tooth structure. bevels...
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Cutting instruments
DR.LINDA MAHER
Hand cutting instruments are used for cutting or removal of tooth structure.
Bevels of the blade:1\(single beveled): Most of hand cutting
instruments have one bevel at the end of the blade that forms the primary cutting edge
2\(bi-beveled):instruments have two bevels that
forms the cutting edge (e.g. hatchet excavator)
CUTTING INSTRUMENTS
EXCAVATOR
1)ORDINAR
Y HATCHET2 )HOE
3 )ANGLE FORMER
4 )SPOON
CHISELS OTHERS
1 )CHISEL2)ENAMEL
HATCHET3 )
GINGIVAL MARGIN TRIMMER
1)KNIVES2)FILES3)SCALERS4)CARVERS
1\CHISELS USED FOR: cutting undermined
enamel (week enamel).Used with push motion.They are 3 types : 1\Straight, slightly curved or bin-
angle. 2\Enamel hatchets. 3\Gingival margin trimmer.
Undermined enamel
1\STRAIGHT,SLIGHTLY CURVED :AND BINANGLED CHESILS
The cutting edge of chisel is perpendicular to the handle.
The cutting edge formed by a bevel on one side only.
Used with push motion.
USED TO: cleave undermined enamel
2\ENAMEL HATCHET :The cutting edge is in a plane
parallel or near to parallel to the long axis of the handle.(BASICALLY IT IS THE SAME AS AN AXE)
The cutting edge formed by a bevel on one side only.
Used with push motion.It is available in right & left
types.
USED TO: cut
undermined enamel
3\GINGIVAL MARGIN TRIMMER:Similar in design to
enamel hatchet except the blade is curved.
Used with pushing & lateral scraping motion.
USES:It is used to smooth the gingival floor of a cavity preparation.
2\EXCAVATORSThese instruments are designed to
excavate and remove carious dentin and to shape the internal parts of cavities.
They are of different types:1. Hoe excavator.2. Hatchet excavator.3. Spoon excavator.4. Angle former
1\HOE EXCAVATOR:Cutting edge nearly
perpendicular to handle.Used with a pulling motion
USE: used to plan walls and floors of cavity
preparation and forming line angles
2\HATCHET EXCAVATOR: Its cutting edge parallel to the long
axis of the handle.DEFFERS FROM ENAMIL
HATCHET IN THAT:1\the cutting edge have two bevels2\enamel hatchet is larger and heavier USE: .These instruments are used on sharpening internal angles.
:3\ANGLE FORMER EXCAVATORMono angled instrument with primary
cutting edge at angle other than 90 degree to the blade
USE:For sharpening internal line angles
:4\SPOON EXCAVATORS It has two types:
1.Discoid: Cutting edges are circular.
2.Cleoid: Cutting edges are claw like.
USES: 1. for scooping out carious dentine. 2. also for carving amalgam.
OTHER CUTTING INSTRUMENTS1\KNIFES:Function: used for trimming excessive
restorative materials
2\ENDODONTIC FILES: function: to remove dead pulp
3\SICKLE SCALER: Function: To remove large amounts
of deposits (calculus) from supra- gingival surfaces, ideal for anterior interproximal area.
Thank you
.