Summary: Topic 3: Dental Materials
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1 Impression Materials
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List the desirable properties of an impression material.
Easy tohandle /mix Accurately record detail Good tear resistance Easy toremove particularly where undercuts exist Dimensionally stable Has ability todisinfect Compatible withoral fluids No adverse effects topatient Pleasant smell /taste
Shortsetting time Cost-effective -
List the factors that can affect the accuracy of an impression materials.
Viscosity
Hydrophobic/hydrophilic materials
Wet-ability of impression surface by dental stone/plaster
Setting Reaction (dimensional change)
Impression retained in the tray -
Which of the three (original oral environment, impression, and model) are positive and negative spaces?
Original oral environment and model are positive spaces, filling up a negative space—impression. -
What kind of model does a contracted impression give rise to?
Oversized model -
What kind of model does an expanded impression give rise to?
Undersized model -
What is modulus of elasticity?
Modulus of elasticity = stress/strain. -
What does a higher modulus of elasticity mean?
Higher modulus of elasticity = greater resistance to elastic deformation under stress -
What are the typical values for modulus of elasticity of brittle and flexible materials?
Brittle - high modulus of elasticity
Flexible - low modulus of elasticity -
What are the essential characteristics of a stock tray for a good impression?
Rigid and non flexible
Extend sufficiently to support the impression material
Fit loosely (Correct size and shape of the dental arch to allow for support of impression material)
Have a robust handle
If not for single use be able to disinfect
Retain the impression material -
What are the three common variations of stock tray materials?
Plastic
Metal
Special tray
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