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27 Cards in this Set
- Front
- Back
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Additional polymerization/free radical polymerization is known as what
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Common mode of reaction for many dental materials |
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Explain Monomer (3) |
Reactive/ Functional groups C=C Liquid of polymer-monomer reactions |
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What are the steps of Polymerization |
Inititation (2 phases Propogation Termination |
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What are the phases of polymerization |
Phase one: Free radical formation (heat, light, chemical) Phase two: free radical that has formed react with C=C double bond form an atomic bond changes to C-C with and unpaired electron at the end of the chain for continual bonding |
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Propogation step |
Same as the 2nd phase in the initiation step= additional 2nd, 3rd, 4th, ect monomers |
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Termination Step |
Two chains contacting and terminating each other or the introduction of contaminants will terminate the reaction |
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What are the methods of activation |
Heat activated Initiator: Benzolperoxide Chemically activated Initiator: Benzoperoxide and is activated by tertiary amines Light Cure Dual Cure: Cures via light and chemical means |
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What is the inhibitor of polymerization reactions |
Hydroquinone
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What are conflicts with the resign and its properties (3) |
Polymerization Shrinkage Coefficient Thermal Expansion Polyermic material lacks strength |
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COMPOSITE MATERIALS |
.............. |
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What are the two phases for composite materials |
Matrix Filler |
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What does the Matrix do (3) |
bis-GMA responsible for creating the solid mass and bonding to tooth structures Weak by itself |
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What is the filler |
Compensate and resolve the weakness of the matrix by itself Increased filler=increased composite strength |
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Increased filler = Decreased resin (matrix) therefore what happens (3) |
Decreased coefficient thermal expansion Polymerization shrinkage decreases Resulting product is more similiar to a natural tooth |
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What are the different types of composite material |
Macrofilled Microfilled Hybrid Improved hybrid |
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Describe macrofilled composites (4) |
1st type developed Quarts Large particles (feels rough) Not ideal for posterior teeth |
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Microfilled composites |
Much smaller Smooth surface Smaller particles are fused silica requires more resign |
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What is a disadvantage for microfilled composites |
Smaller particles are fused silica less filler for strength |
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Hybrid Composites |
Blended composites |
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Improved Hybrid |
Increased number of nano particles further decrease the resin-filler ratio while retaining strength, esthetics, and physical properties |
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What are factors to consider with composite (3) |
Depth of cure Incremental addition Air Inhibition |
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What is depth of cure |
The thickness of the composite that is to be cured by light |
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Glass IONOMER MATERIAL |
............... |
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What are the different types of glass ionomers (4) |
Chemical cured glass ionomer Resign modified glass ionomer Acid base chemically activated resign modified glass ionomer Recharging glass ionomer |
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Describe chemically cured glass ionomer (4) |
Acid base reaction FL releasing 1st true adhesive material Crazing |
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Describe resign modified glass ionomer (1) |
Acid base reaction in combination via light or chemical activation |
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Describe Acid based chemically activated resign modified glass ionomer (2) |
Superior Need in instances where directed light cannot access the material |
