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Dental materials test 1
Terms in this set (26)
Which product is produced by heating gypsum with pressure?
Which of gypsum product is heated in calcium chloride?
Die stone(high strength)
Which of the gypsum product requires the most water to mix?
Name the model used to fabricate a restoration?
Name of a highly accurate model of a single tooth
What are centers of needle like crystals that interlock called?
They are the seeds from which crystals grow
Nuclei of crystallization
What is the manufacturing process in which water is driven out of the gypsum particles?
Name the product used for observation of oral structures?
What is it called when wax is melted in investment and molten metal is poured in?
Lost wax technique
What is the time from the beginning of the mix until the gypsum can no longer be manipulated called?
What is sticky wax used for? Describe its appearance.
Orange, brittle sticks
Melted and used to "glue" models back together
Which wax comes in a flat, pink sheet and is used to set denture teeth?
Which wax comes in long ropes and can be used to extend impression trays?
Describe the appearance and use of boxing wax?
Red 1 and ½ inch strips used to make a form of pour a model
What is casting wax used for?
To create partial frameworks or other restorations that then placed in investment plaster(lost wax technique)
Accelerates the setting time
Retards setting time
Accelerates setting time
More water in mixture
Retards the setting time
Accelerate the setting time
What kind of fluoride is used for desensitizing?
With regard to wettability, what does hydrophilic describe?
It has a low contact angle(or spreads out)
Which restorative material has thermal conductivity most similar to tooth structure?
Composite 2.6 (Enamel 2.0)
Which of the gypsum materials expands the most and why?
Plaster(because more water is used) Less dimensional accuracy)
How does cold water effect the setting time?
Retards the set time
What is the term that describes production of heat resulting from the reaction of some materials when mixed?
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