class ii amalgam restoration – 36moweb.hku.hk/~imky/ipr/presentation.pdf · three. filling...
TRANSCRIPT
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INTERNATIONAL PEER REVIEW
CLASS II AMALGAM
RESTORATION – 36MO Leung Kwan Yu, Steve
BDS II - Class 2019, The University of Hong Kong
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instruments
Mirror
Periodontal probe
Hatchets
Gingival margin trimmers
Tofflemire matrix retainer
Amalgam carrier
Condensers
Carvers
Straight probe
Burnishers
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ONE. mesial box preparation
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ONE. mesial box preparation
Identify contact point
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ONE. mesial box preparation
Identify contact point
Just below
contact
Where carious lesion
most likely occur
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ONE. mesial box preparation
Start cutting a mesial box of about 2-3mm, with a tungsten carbide 330 bur on high speed handpiece
Retention form
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ONE. mesial box preparation
Pendulum movement of
bur helps create this Retention form
Start cutting a mesial box of about 2-3mm, with a tungsten carbide 330 bur on high speed handpiece
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ONE. mesial box preparation
Hachet remove mesial wall
Resistance to fracture
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ONE. mesial box preparation
Checking with condenser
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ONE. mesial box preparation
Gingival margin trimmer remove unsupported enamel smoothen edges and walls
Axiopupal line angle usually
bevelled or rounded to reduce
stress concentrating at that area
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ONE. mesial box preparation
Checking with straight probe that all margins are smooth
Axiopupal line angle usually
bevelled or rounded to reduce
stress concentrating at that area
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ONE. mesial box preparation
A box with caries removed,
and with contact broken on lingual, buccal and gingival surfaces
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TWO. occlusal preparation
Occlusal cavity improves
retention
About 2-3mm deep
Start with central pit. Then cut
a slot down to mesial box Isthmus for
retention
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THREE. filling amalgam
Tofflemire matrix and retainer Wrapped around 36
A wedge can be placed to
allow better adaptation
Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing
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THREE. filling amalgam
Tofflemire matrix and retainer Wrapped around 36
A wedge can be placed to
allow better adaptation
Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing
The use of rubber dam is
also recommended to
prevent the newly placed
amalgam from contamination
by moisture.
Strength and corrosion
resistance of the amalgam
may be affected adversely
if it is contaminated by
moisture.
If the alloy contains zinc, such
contamination may result in
delayed expansion.
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THREE. filling amalgam
SDI lojic+: platinum modified,
high silver, non-gamma 2
spherical amalgam
Mix the amalgam
with amalgamator (brand: SDI
ultramat 2); 8 seconds
Place the first increment of
amalgam and condense
Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing
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THREE. filling amalgam
Condense after adding each
increment
Condenser and
Mortonson 2 condenser
Overfill the cavity slightly
SDI lojic+ (slow set)
pick up and condensing time: 4 minutes;
carving time: 6 minutes
Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing
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THREE. filling amalgam
Run a straight probe tip along
proximal surface to create
marginal ridge, and remove
excess amalgam
Carefully remove the retainer,
then the matrix band
Carve from marginal ridge
towards centre of tooth
Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing
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THREE. filling amalgam
PK Thomas Burnisher
Ball Burnisher
Burnishing to obtain smoother
surface, before polishing
Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing
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THREE. filling amalgam
Finishing and Polishing 24
hours after placement
In slow speed handpiece with
water spray
Use burs from coarse to fine
Finishing burs:
Dome-shaped, pear-shaped,
flame-shape, green stone
Polishing rubber points:
Brownie, greenie,
super greenie
Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing
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You may want to discuss…
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References
Banerjee, A. (2011). Pickard's manual of operative
dentistry. Oxford university press.