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Amalgam Technical Aspect
1
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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INTRODUCTION
Silver colored restorative material.
Dental amalgam is a metal like restorative material
composed of a mixture of silver/tin/copper alloy
and mercury.
ANSI/ADA Specification No. 1
2
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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Alloy Particles for Amalgam + Mercury Dental Amalgam + Nonreacted Alloy Powder Particles
Mercury is liquid at room temperature so it is easily alloyed with solid metal.
The basic setting reaction of amalgam is -- 3
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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SUCCESSFUL AMALGAM RESTORATION
Controlled by Manufacturer Controlled by
Dentist
Selection of alloy Proportioning Trituration Mulling Matricing Condensation Carving Burnishing Finishing & polishing
Composition of alloy Size and shape of alloy Heat treatment of alloy Surface treatment of alloy Mode of supply
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Low Cu alloy
(5% or less)
(β + γ) + Hg
(γ1 + γ2) +
unused(β + γ) γ2- weakest
phase
Least stable and
corrosive
High Cu alloy (13%-30%) COPPER
(Ag-Sn-Cu) +Hg
(γ1 + η) + Unused alloy
η- Corrosion resistant phase
High compressive strength Better marginal adaptation Low creep(0.1%-1%)
High Creep (1%-8%)
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Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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ZINC
Zn Containing
(>0.01% )
Non Zinc
Containing
(<0.01% )
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Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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MODE OF SUPPLY
Alloy powder & mercury. Disposable capsules with pre proportioned alloy powder & mercury.
Preweighted pellets or tablets & mercury in sachets.
Self activating Capsules.
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DISPOSABLE CAPSULES
- Disposable capsules contain preproportioned
alloy particles and mercury separated by a membrane.
- Before use the membrane is ruptured by compressing
the capsule.
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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PREWEIGHED PELLETS
Conventional method of correctly dispening alloy.
Uniform in weight.
Proper handling to avoid chipping of pellet.
An accurate mercury dispenser is required.
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DISPENSERS 10
• Dispensers are based on volumetric proportioning.
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SELF ACTIVATING CAPSULES
• Automatically releases mercury into alloy chamber during first few oscillations of amalgamator.
• Eliminates chances of Hg spills during proportioning.
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SELECTION OF ALLOY
Shape of
alloy
Composition of
alloy
Size of
alloy
A high copper spherical single compositional or admixed type of alloy is mostly preferred in 90% of cases.
12
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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PROPORTIONING
Signifies the parts by weight of Hg and of alloy to be used for particular technique.
alloy composition
particle size and shape
heat treatment
manipulation
condensation technique
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Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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MERCURY/ALLOY RATIO 14
High mercury technique
Historically
To achieve smooth and plastic mix
Hg added in excess in final restoration
Deleterious effect on physical and chemical properties of amalgam
So manipulative procedures to remove excess mercury- Squeezing mixed amalgam before insertion of increments. Removal of Hg rich amalgam during condensation of each increment.
Amount of alloy powder and Hg in wt% that is required for trituration.
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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MINIMAL MERCURY TECHNIQUE
EAMES TECHNIQUE
15
Recommended Hg/alloy ratio- Lathe cut Alloys – 1:1 or 50%
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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TRITURATION
The process of grinding powder, especially within a liquid. In dentistry, used to describe the process of mixing the amalgam alloy particles with mercury.
PHILLIP’S 11TH EDITION
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Remove oxide film on
the surface of the
alloy particles.
for proper wetting
by Hg .
Provide proper
amalgamation &
achieve a workable
mix giving more
working time.
17 OBJECTIVES OF TRITURATION
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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Using mortar & pestle. 2-3 psi trituration pressure is required. Excessive force can lead to weakening of matrix. Takes more than 45 sec.
18 HAND TRITURATION
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MECHANICAL TRITURATION
Trituration of amalgam alloy and Hg is done with a mechanical mixing device called AMALGAMATOR. Time ranges from 3 to 30 seconds.
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ADVANTAGES OF MECHANICAL TRITURATION
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No need to squeeze excess of mercury, since alloy / mercury ratio is proportioned by manufacturer.
Standardizes the procedure. Uniform mix can be attained.
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CONSISTENCY OF MIX
Rough and grainy.
More porous. Low
in strength. Less
corrosion resistance.
Shiny, smooth
surface and
consistency.
Separates as a
single mass from
capsule.
Soupy
Difficult to remove
from capsule.
Too plastic to
manipulate.
Undertriturated Normal Overtriturated
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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Working time decreases
Dimensional changes
Creep increases
Compressive and tensile strength decreases
EFFECTS
OF
OVER
&
UNDER
TRITURA
TION
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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MULLING
• Continuation of trituration
• Improves the homogeneity of the mass, improves texture.
• Should not be done with bare hands.
• ADVANTAGES - helps to uniformly coat the alloy particles with Hg
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TYPES OF MULLING 24
Mechanical mulling –
After mechanical trituration pestle is removed from
capsule mix is triturated at low speed for 2 to 3
seconds.
Hand mulling – Mix is placed in dry piece of rubber dam
or glove and vigorously rubbed between first finger and
thumb.
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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S Q U E E Z I N G
25
Excess Mercury is squeezed out as fine droplets from a muslin cloth
Thick condensable plastic paste
Squeezed amalgam is collected in well of dappen dish and loaded in amalgam carrier
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MATRICING
• Cavity preparation involving more than one surfaces, in order to have the required four surrounding walls and a floor for amalgam condensation into a cavity, a matrix should be adapted to tooth.
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CONDENSATION
The method of packing amalgam mix in its plastic state into the prepared cavity so as to achieve the greatest possible density of the material when set.
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To adapt the plastic
amalgam mix to cavity
walls and margins.
To remove unreacted Hg out
of increments during building
up restoration.
To reduce the
number of voids.
30
OBJECTIVES
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HAND CONDE SAT N
31
Started with small increment at the centre of cavity
Condensor point stepped 45° at line and point
angles
Subsequent condensation at 90° to prevent
displacement of previous one
Each portion condensed from
centre to periphery
Shiny appearance after
condensation
Process continues till restoration is
overfilled
presence of sufficient Hg for
diffusion and bonding to increment
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PRINCIPLES OF HAND CONDENSATION
Field of operation – moisture free to avoid delayed expansion
Smaller increments to avoid voids and adapt alloy to cavity walls
Condensed immediately within 3-4 minutes
Time increased, Amalgam prone to fracture & Creep
Modern amalgam, rapid hardening so rapid condensation done
Never touched with bare hands
Chances of contamination Harmful for clinician
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33 DOUBLE ENDED CONDENSOR
Contra angled with serrated and smooth ends. Serration make surface rough aiding mechanical
bonding between increments.
CONDENSATION PRESSURE
Condensation force- 13.3-17.8N(3 to 4lb).
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• Use rapid vibration • Used where high condensation forces are
required.
• Not recommended because of increased mercury levels in dental office.
MECHANICAL CONDENSORS
ULTRASONIC CONDENSORS
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PRE CARVE BURNISHING
Continuation of condensation. Strokes are from restoration towards cavosurface margin. A large round burnisher with light strokes is used.
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BURNISHING • Burnishing is defined as the plastic deformation of a surface due to rubbing/sliding contact with another object.
• Burnishing is accomplished with a ball burnisher.
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• To Improve marginal adaptation
• To bring any excess Hg to the surface
O B J E C T I V E S
37
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CARVING 38
Anatomical sculpturing of the amalgam material
Amalgam should hard enough to offer resistance to carving instrument.
So a scraping sound of AMALGAM CRYING should be heard
While carving the edge of carver should always rest on cuspal inclines.
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• To produce proper physiological contours.
• A restoration with adequate, compatible marginal ridges.
O B J E C T I V E S
39
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CARVers
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Amalgam scrap in clinics can be managed by 1. By mixing it with fixer because it has
unreacted silver particles with which mercury can bind
2. By mixing it with glycerine because it has very high viscosity.
3. BY mixing excess scrap in 14 litres of water as liquid mercury is 14 times denser than water.
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OCCLUSAL ADJUSTMENTS 42
To remove excessive occlusal contacts during centric loading and excursive mandibular movement. 1.Patient is asked to occlude, if any burnished (shiny) points or heavy centric stops are visible its indicative of high points and is needed to be removed.
2.Articulating paper is commonly used to determine high points
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To remove scratches and
irregularities on the amalgam surface
Done by ball burnisher with gentle
strokes from the amalgam to the
tooth surface
Rubbing the surface with a moist
cotton pellet.
43
POST CARVE BURNISHING
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removes surface irregularities
FINISHING
POLISHING
The process that removes the scratches & irregularities from the surface of the restoration leaving a smooth , highly glazed surface that is corrosion resistant.
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FINISHING
Removal of gross overhangs and
flashes
• Finishing Burs
Removal of unwanted shiny
contacts
• Finer finishing
burs and disc
Removal of Superficial
scratches and irregularities
• Finer
rubber
cups
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• Finishing strips for
proximal surfaces
POLISHING • Rubber cup
with flour of
pumice
Dr. Shikha Jaiswal , Subharti Dental College, SVSU
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I. Do not eat for an hour.
II. Do not bite together hard or eat on new amalgam fillings for 2 to 3 hours
III. Do not eat hard or very crunchy foods for 24 hours.
IV. Avoid hot and cold drinks or foods for 4 – 5 hours
Dr. Shikha Jaiswal , Subharti Dental College, SVSU