RESTORING CAVITIES - AMALGAM

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Mind Map by , created almost 6 years ago

Restorative dentistry Mind Map on RESTORING CAVITIES - AMALGAM, created by aahughes on 10/18/2013.

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Created by aahughes almost 6 years ago
PRINCIPLES OF CAVITY PREPARATION
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TOOTH MORPHOLOGY
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FISSURE SEALANTS
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CHEMISTRY C1 1
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Cristina Cabal
TOOTH MORPHOLOGY 2
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RESTORING CAVITIES WITH DENTAL AMALGAM
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GLASS IONOMER
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COMPOSITE RESIN
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APPROXIMAL CARIES
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RESTORING CAVITIES - AMALGAM
1 An alloy of mercury with another metal
2 HISTORY
2.1 1833 CRAWCOUR BROS introduced amalgam to US
2.2 Powdered silver coins mixed with mercury
2.3 1895 GV BLACK developed formula of modern amalgam alloy
2.3.1 1960's conventional low-copper lathe-cut alloy (smaller particles)
2.3.2 1970's 1st single compostion spherical - Ternary system silver/tin/copper
2.3.3 1990's mercury free alloys (Gallium) - increased corrosion
3 AMALGAM TODAY
3.1 conventional low copper alloys
3.1.1 Admixed high copper alloys
3.1.1.1 single composition high copper alloys
3.1.1.1.1 NOWADAYS copper enriched more likely to be used
4 WHY AMALGAM?
4.1 Inexpensive and easy to use
4.1.1 Proven track record >100yrs
4.1.1.1 Less allergies than composite
5 THERAPIST CONTROLLED VARIABLES
5.1 TRITURATION - mixing time
5.1.1 Over - decreases working time
5.1.2 Under- crumbly mix
5.2 CONDENSATION - packing material
5.2.1 Lathe cut - small cd, high force
5.2.2 spherical alloy - large cd, less sens to force
5.2.3 Admixture alloys - intermediate handling between both above
5.2.4 CONDENSING RULES!
5.2.4.1 Condenser must fit!
5.2.4.2 place in small increments
5.2.4.3 heavy pressure
5.2.4.4 Overpack then carve
5.3 CARVING RULES
5.3.1 Carve back to cavity outline
5.3.2 Remove Hg rich layer
5.3.3 simulate anatomical form
5.3.4 smooth amalgam/enamel junction
5.3.5 Check occlusion
6 POLISHING AMALGAMS
6.1 24HRS AFTER SETTING
6.1.1 smooth, less plaque retention, less corrosion
7 BONDED AMALGAM RESTORATION
7.1 When there is not enough tooth substance to allow amalgam eg missing cusps
7.2 to complete marginal seal - prevent ingress of bacteria and protects pulp
8 ADVANTAGES OF BONDED AMALGAM
8.1 No need for retentive feature
8.1.1 No need to use pins
8.1.2 Reduced marginal leakage and post op sensitivity
8.1.3 Reinforcement of tooth structure
9 DISADVANTAGES
9.1 Time consuming
9.1.1 More expensive than traditional amalgam
10 TECHNIQUE
10.1 Vitrebond liner, etch prime and bond
10.1.1 place chemical cure resin based luting cement
10.1.1.1 pack and carve amalgam
11 AMALGAM TOXICITY
11.1 TOXICITY - mainly from mercury
11.1.1 ALLERGY- contact derm Lichen planus
11.1.1.1 MERCURY POISONING
11.1.1.1.1 headaches,GI upsets, dyspepsia,tremors
11.1.1.2 salivation/xerostomia, severe gingivitis, fatigue, odema of face and ankles

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