Dental Materials Ch. 2 Flashcards Preview

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Flashcards in Dental Materials Ch. 2 Deck (10)
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1
Q

the molecules found in a pane of glass can be best described as

(a) Crystalline solid, having short-range order only

(b) Crystalline solid, having both short-range and long-
range order

(c) Amorphous solid, having long-range order
(d) Amorphous solid, having short-range order

A

(d) Amorphous solid, having short-range order

2
Q

a partial charge resulting from an uneven distribution of electrons around an atom forms a bond known as

(a) Metallic
(b) Secondary
(c) Covalent
(d) Ionic

A

(b) Secondary - partial charges result

3
Q

what type of bond is formed when the electrons are shared by all the atoms that make up that object and may be thought of as positive cores in a cloud of negative mobile valence electrons

(a) Metallic
(b) Secondary
(c) Covalent
(d) Ionic

A

(a) Metallic

4
Q

a notable advantage of using ceramic materials in dentistry is the property of

(a) Transparency
(b) Translucency
(c) Opacity
(d) Brittleness

A

(b) Translucency

5
Q

a dental polymer with many cross-links as compared to one with no cross-links would be a dental material that is

(a) Flexible but strong
(b) Flexible and weak
(c) Stiff and strong
(d) Stiff but weak

A

(c) Stiff and strong

6
Q

all of the following are examples of composite except

(a) Set Jell-O with sliced peaches
(b) Enamel
(c) Fiberglass
(d) Tin foil

A

(d) Tin foil

7
Q

when the shared electrons of a covalent bond are not shared equally, and one of the bonded atoms is partially positive and the other is partially negative a ________ is formed

(a) Permanent dipole
(b) Fluctuating dipole
(c) Hydrogen bond
(d) Primary bond

A

(a) Permanent dipole

8
Q

the sliding of atoms past each other allows this material to bend, not fracture, and maintain its strength. this material is an example of

(a) Metal
(b) Ceramic
(c) Polymer

A

(a) Metal

9
Q

a mixture of 2 liquids that do not blend together to form 1 liquid is termed a

(a) Composite
(b) Emulsion
(c) Colloid
(d) Solution

A

(b) Emulsion

10
Q

when 2 atoms share a pair of electrons, the resulting atomic bond is termed a ________ bond

(a) Secondary
(b) Ionic
(c) Covalent
(d) Metallic

A

(c) Covalent