Podcast
Questions and Answers
Amalgam is measured during the setting of an amalgam and reflects the change in dimension.
Amalgam is measured during the setting of an amalgam and reflects the change in dimension.
Flow
The ______ phase of amalgam is made up of tin and is the weakest component.
The ______ phase of amalgam is made up of tin and is the weakest component.
tin
Amalgam is often used for restoring ______ teeth.
Amalgam is often used for restoring ______ teeth.
posterior
Amalgam is not recommended for restoring ______ teeth due to its aesthetic limitations.
Amalgam is not recommended for restoring ______ teeth due to its aesthetic limitations.
Signup and view all the answers
Zinc in amalgam acts as a ______ for oxides.
Zinc in amalgam acts as a ______ for oxides.
Signup and view all the answers
Signup and view all the answers
Flashcards
Amalgam Composition
Amalgam Composition
Amalgam is an alloy made from mercury and a silver-based alloy, often used in dental restorations.
Flow in Amalgam
Flow in Amalgam
Flow is measured during the setting of an amalgam, indicating changes in dimension as it hardens.
Creep in Amalgam
Creep in Amalgam
Creep refers to the deformation of amalgam measured after setting, indicating its long-term stability.
Indications for Amalgam Use
Indications for Amalgam Use
Signup and view all the flashcards
Contraindications for Amalgam
Contraindications for Amalgam
Signup and view all the flashcards
Study Notes
Amalgam Alloys
- Composed of mercury and silver-based alloys
- Variants exist, requiring in-depth knowledge
- Not always compatible without further study
Amalgam Components
- Silver: 65%, increases setting time and strength
- Zinc: 2%, scavenges oxides, weakens the alloy for plasticity
- Tin: 30%, weakest phase, giving plasticity to amalgam
- Copper: 6%, increases compressive strength
- Lower copper: contains 4% or less, initial set 30 minutes, full set 24 hours
- High copper: contains more than 10%, full set 20 minutes
Amalgam Particle Sizes
- Micro cut
- Fine cut
- Coarse cut
Amalgam Properties
- Flow: measured during setting, indicates dimensional change
- Creep: measured after setting, shows constant change in rough and irregular surfaces
Amalgam Indications
- Posterior teeth restorations (Classes I, II, V)
- Anterior lingual surfaces
- Distal canine surfaces
- Anterior teeth restorations (Classes III, IV, V)
Amalgam Contraindications
- Specific tooth types or situations
Amalgam Advantages
- Easy manipulation and insertion
- Insoluble in oral fluids
Amalgam Disadvantages
- Susceptible to tarnish and corrosion
- Galvanic action
Amalgam Shapes
- Spherical: smooth surface
- Irregular: lathe-cut, spherical with irregular surface, spheroidal
- In Between: Shapes fall in between these two
Amalgam Techniques
Choosing Alloy and Mercury
- Zinc containing: decreases brittleness. Acts as a deoxidizer or scavenger
- Zinc free: eliminates moisture, less workable, and brittle
Proportioning Alloy and Mercury
- High mercury technique: 52-53% mercury, flowy
- Minimum mercury/Eames technique: 1:1 amalgam mix (equal amounts of mercury and powder)
Role of Mercury
- Harmful and toxic
- Reluctant with alloy particles
- Easy trituration/wetting of alloy particles
- Pre-condense mercury influences amalgam plasticity
Trituration
- Creates a workable mass within 2 mins, or 6 seconds using a capsule
- Removes oxides from powder particle surfaces
- Increases alloy particle surface area
Mulling
- Dissolves some particles in mercury (homogeneity improved)
- Blends the mass (2-5 seconds)
Matricing (Tofflemaire)
- More than one surface involved
- Technique details necessary
Condensation
- Mercury is manually compacted into increments
- Using a plugger, the mercury is squeezed out of the mix, 3 mins
- Builds up the restoration
Burnishing/Surfacing
- Amalgam surface is manipulated to reduce voids and accommodate the tooth
- The mercury is brought to the cavosurface margin
- Amalgam is conditioned before carving
Carving
- Sculpting into the desired shape, anatomical details accounted for
- Amalgam is adapted to cavosurface margin and external periphery
- Anatomical sculpting of amalgam (Holimback method)
Finishing and Polishing
- Removing flash and overhangs
- Correcting minor enamel underhangs
- Removing surface scratches
- Polishing with pumice, dentrifices, tin oxide, rubber cups, brushes, finishing disks/stones/burs
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz explores the composition, properties, and applications of amalgam alloys in dentistry. Understand the various components, particle sizes, and indications for using amalgam in dental restorations. Aimed at dental students and professionals for reinforcing their knowledge of dental materials.
