Prosth/LAB stuff Flashcards
Shrinkage porosity is associated with….
the diameter of the sprue
Main function of the liner used in a casting ring is to…
allow UNIFORM and UNINHIBITED setting EXPANSION of the investment
What does Back pressure porosity do?
rounded margins in the casting
A material with HIGH COMPRESSIVE STRENGTH and LOW TENSILE STRENGTH is considered what?
Brittle
Where should the thinnest portion of the WAX PATTERN be placed in the casting ring?
DEEPEST PART OF THE RING
SILVER in metal-ceramic alloys can cause…
GREEN discoloration of the porcelain
When comparing HIGH GOLD alloys to BASE METAL alloys….base metal alloys: have a _______ melting point, _______ specific gravity, and a generally _______ yield strength and hardness
HIGHER melting point, DECREASED specific gravity, and generally HIGHER yield strength and hardness
What physical property of gold gives it the ability to be burnished?
Percentage of elongation (increase in length of a material when subjected to tensile forces)
Wax patterns for cast restorations should be invested as soon as possible after they are completed to minimize distortion caused by….
RELAXATION of INTERNAL STRESS of the WAX PATTERN
The degree of ________ of metal limits the number of times a base metal clasp can be adjusted before it breaks or fractures.
ELONGATION
The function of calcium hydroxide in apexification: Creation of a _______ conductive to bone growth
HIGH pH
The only property of a base metal alloy which is numerically lower than gold is
specific gravity
WHAT COLOR stain is commonly used to change the hue of porcelain??
Orange
_______________ should be done to correct protrusive disclusion of posterior teeth during a try-in appointment of balanced occlusion complete dentures
Increasing the compensating curve
__________ occurs when the denture teeth are set up without following the compensating curves specifically designed for a particular patient.
Protrusive disclusion
