18 Questions
What is the term for the temperature at which a material melts or freezes?
Melting or freezing temperature
Which physical property of a material is defined as its mass per unit volume?
Density
What is the reason why low-density alloys require higher pressure during casting?
To allow rapid filling of the mold cavity
Why are non-metallic denture base materials preferred over metallic denture base materials?
Because they are lighter in weight
What is the term for the ability of a material to conduct heat?
Thermal conductivity
What type of alloys require special casting machines during casting?
Cobalt chromium alloys
What is the main consequence of a large difference in coefficient of thermal expansion between the filling material and the tooth structure?
Marginal leakage and percolation
What is the importance of close matching of CTE between artificial teeth and denture base?
To prevent crazing of the denture base resin
What is the clinical importance of specific heat in dentistry?
To determine the total amount of heat required to raise the temperature of the metal or alloy to the melting point
What is the characteristic of gold alloys that makes them easier to melt and cast?
Low specific heat
What is the unit of measurement for specific heat?
J/g°C
What is the result of a high difference in CTE between the filling material and the tooth structure?
Marginal leakage and percolation
What is the phenomenon where objects appear color-matched under one type of light and different under another light source?
Metamerism
Which of the following factors affects color selection by modifying the type of light reaching the object?
Surroundings
What is the effect of high translucency on the color appearance of an object?
It gives a lighter color appearance
Why is it recommended to rest the eyes when comparing shade guides?
To avoid color fatigue
What is the effect of increasing the thickness of an object on its color appearance?
It decreases the value and brightness
How many light sources should be used when performing color matching?
Two, one of which is sunlight
This quiz covers the importance of thermal expansion in dental fillings, the concept of marginal leakage, and its relation to the coefficient of thermal expansion between tooth structure and filling material.
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