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.

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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

.