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18 Cards in this Set
- Front
- Back
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List some direct restorative materials |
Amalgam
Glass ionomer cement
RMGIC
Resin composites
Compomers
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Name some Direct restorative features |
Command set
Simple procedure
Cost
Bulk placement
Recurrent caries |
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What is a polymer? |
A large chain like molecule made up of monomers which are small molecules.
We can find natural and synthetic polymers. |
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What is polymerisation? |
When monomers form a covalent bond chain and become polymers |
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What are the three types of polymers and their characteristics? |
Linear
Cyclic
Branched- straight un-branched chains can pack together more closely becoming stronger.
Cross linked- If the polymer chains are linked together extensively by colvent bonds the polymer is harder and more difficult to melt.
Chain length- longer the chain, stronger the polymer.
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What are the three types of polymers and their characteristics? |
Linear
Cyclic
Branched-
straight un-branched chains can pack together more closely becoming stronger.
Cross linked-
If the polymer chains are linked together extensively by colvent bonds the polymer is harder and more difficult to melt.
longer the chain, stronger the polymer.
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What is TG? Give details |
Glass transition temperature.
The temperature at which the polymer chains begin to flow past each other. |
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What is an Alloy? |
Metals which are used in combination with other metals. |
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What is an Alloy? |
Metals which are used in combination with other metals. |
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List the three types of Alloys |
Substitutional solid
Intersitial solid solution
Intermetallic compounds |
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What is a phase diagram? |
A means of representing the structure of alloys as a function of composition |
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List the five constituents of dental amalgam |
Silver Tin Zinc Mercury Copper |
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Why are amalgam restorations placed? |
Primary caries
Secondary caries
Poor margins
Restoration fracture
Tooth fracture |
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List 5 types of amalgam currently available |
Conventional amalgams
High copper dispersed phase amalgams
High copper single phase amalgams
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List 5 types of amalgam currently available |
Conventional amalgams
High copper dispersed phase amalgams
High copper single phase amalgams
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List some problems with amalgam |
Lack of aesthetics
Non- adhesive
Lack of strength
Susceptible to corrosion
Biocompatibility |
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List some benefits of high copper amalgams |
Reach full strength quicker
Easy to condense
Easier to carve and polish
Lower mercury content
High strength
More resistant to corrosion |
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List the 4 mechanisms of adhesion |
Micro mechanical adhesion
Physical adhesion
Chemical adhesion
Molecular entanglement |
