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Instrumentation
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Hand Instruments
Carbon steel + Stainless steel
Carbon steel is brittle and
susceptible to corrosion
Stainless steel dose not tarnish or
corrode ,but it will not maintain a
sharp cutting edge
Most are double-ended
Cutting & None-cutting
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Parts of the Hand Instruments
a. Blade or nib
Working end
Form 45 angle with
the shank
b. Shank
Connect handle
to bladeC. Handle
Hold, stabilize
& control the instrument
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Hatchet ( enamel
hatchet)
Double-ended form
Right and left cutting
ends to use in both sides
of the preparation Removal of unsupported
enamel
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Gingival Margin Trimmer Curved blade
Mesial & distal gingivalmarginal trimmer
Right and left cutting
ends
Mainly for trimming
gingival margins
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Spoon Excavators
Right and left cutting
spoons
They are used forremoval of carious tooth
structure and soft dentin
Different shapes
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Amalgam condenser To compress amalgam in
all areas of the
preparation
May be also used to
adapt resin composite
material
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Carvers:
Are used to shape soft
amalgam
Cleoid-discoid carver for
carving of occlusalsurfaces
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Burnishers: To burnish (smooth)
amalgam restorations To shape the metal
matrix band
To condense amalgam at
the margins To adapt composite in
posterior resin compositerestorations
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Amalgam Carrier
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Amalgam Carrier
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Amalgam Carrier
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Other Instruments
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Rotary Instruments
Air-driven handpieces
Low speed handpiece
10,000-15,000 rpm
For removal of caries
and polishing of
restorations
Different attachments:latch or friction grip
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High speed handpiece
up to 100,000 rpm
Cavity preparation
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Burs
Burs are milling devices and function by chipremoval of tooth structure.
Tungsten carbide bur.
Their heads are composed of a number of metalcutting blades and must rotate incounterclockwise direction .
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Burs
Parts of the bur:
Shank: Part that fits on
the handpiece Neck: Connect the head
to the shank, transmit
forces to the head Head: The working part
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Basic Burs Head Shapes
Classification
Head shape
Number
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Recommended Burs
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Finishing Burs
Come in many sizes &
shapes
Have more blades thannormal bur and the blades
are set much closer together
Finishing & polishing
operations for amalgam &resin composites
restorations
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Instrument Grasps
Pen grasp & modified
pen grasp
Palm and thumb grasp
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