Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
|
Silica based restorations are:
a. translucent b. brittle c. opaque d. strong |
Silica restorations are:
Translucent & Brittle |
|
|
Alumina and zirconia are:
a. weak ceramic materials used to laminate (place on top of, coat FS restorations) b. Strong ceramic materials that are used to fabricate strong cores for all ceramic restoration c. fruit extracts d. acrylic derivatives for the enhancement of ceramic crowns |
Strong ceramic materials used to fabricate strong cores for all ceramic restorations
|
|
|
What are the main disadvantages of alginates compared with rubber materials?
|
Not much surface detail
need quick pour up |
|
|
What are the most common noble metals used in alloys?
|
Pd, Au, Pt
|
|
|
Which metal or metals increase ductility?
|
Gold
|
|
|
What are the classifications of impression materials?
|
Rigid impression materials (non elastic)
Elastic impression materials hydrocolloid non-aqueous elastomers |
|
|
Which of the following statements is not true for monomers?
a. molecular weight of 100 b. volatile liquid c. not toxic d. boiling point 100 degrees C e. sweet odor |
C. not toxic
|
|
|
Which of the following statements is not true for the initiator of the polymerization reaction?
A. IS ORGANIC PEROXIDE B. DECOMPOSED INTO FREE RADICALS C. CAN BE DECOMPOSED BY ORGANIC AMINES D. DECOMPOSED BY HEATING E. DECOMPOSED BY INORGANIC ACCELERATORS |
E. DECOMPOSED BY INORGANIC ACCELERATORS
|
|
|
Resistance to fracture of acrylic polymers can be improved by?
|
Butadiene-styrene rubber
butyl methacrylate |
|
|
The main component of the acrylic denture base powder material is?
|
polymethyl methacrylate
|
|
|
Describe the chemical reaction of gypsum
|
Hemihydrate + H2O -> dihydrate (gypsum) + heat
CaSO4*1/2H2O + 1 1/2H2O -> CaSO4*2H2O + heat |
|
|
The hardness of dental materials is reported in?
|
knoop hardness
|
|
|
The affinity of a liquid for a solid is used as a measure for?
|
wettability
|
|
|
When waxes are heated, they expand significantly. This expansion can be quantified as:
|
Parts per million of expansion per C degree
coefficient of thermal expansion |
|
|
Increasing the inorganic filler particles would:
|
Improve the physical chem and mech properties of the matrix
Decrease the polymerization shrinkage Reduce the coefficient of thermal expansion |
|
|
T/F the primer has both hydrophobic and hydrophilic properties
|
True
|
|
|
Dental amalgam wears at a rate similar to
|
tooth structure
|
|
|
What lights will polymerize composites?
|
1) Blue Light
2) UV Light 3) Sun Light (NOT infrared light) |
|
|
What are the main disadvantages of alginates compared with rubber materials?
|
Not much surface detail
Need Immediate Pour up |
|
|
What are the most common noble metals used in alloys?
|
Pd, Au, Pt
|
|
|
Which metal or metals increase ductility?
|
Gold
|
|
|
What is the classification of the impression materials?
|
Rigid Impression materials (non-elastic)
Elastic impression materials (Hydrocolloid) Non-aqueous elastomers |
