D Material Flashcards
Requirements of impression materials
Impressions DEF:
Trays & types
Function of Primary Cast
Function of Secondary Cast
Stock tray -> ______
Special tray-> ______
Elastic & Flexible (requirements)…
Classification of impression materials:
Rigid
According to elasticity after setting
-
Classification of impression materials:
Elastic
According to elasticity after setting
-
Classification of impression materials:
Physical reaction
According to setting reaction
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Classification of impression materials:
Chemical reaction
According to setting reaction
-
Thermoplastic material DEF
Soften when heated
Hardens when cooled
Thermoplastic material used for..
Impression compound TYPE 1 & uses
Impression compound TYPE 2 & uses
Composition of Impression compound:
- Thermoplastic materials
- fillers
- plasticizer
- coloring agent
Filler’s purpose in impression compounds
To give body and suitable working consistency
Ex. Talc
Thermoplastic purpose in impression compounds
To give thermoplasticity, flow and cohesion
Ex. Natural resin and waxes
Plasticizer purpose in impression compounds
To act as lubricant and control consistency (+fillers)
Ex. Stearin
