dr.linda maher. hand cutting instruments are used for cutting or removal of tooth structure. bevels...

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

.