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Operative 1 > Midterm ? > Flashcards

Midterm ? Flashcards

1
Q

Common cumulatitve trauma disorder?

A

built up microtrauma

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2
Q

KNOW what are NOT cumulative trauma disorders

A
  • chronic lower back pain
  • tension neck syndrome
  • trapezius myalgia
    *rotator cuff inpingment
  • carpal tunnel

these ALL are

CCTTR

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3
Q

Sit with feet in _____ with knees _____

A

tripod, lower than hips

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4
Q

Keep _____ away from the margins

A

calcium hydroxide

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5
Q

What do you condense first when placing amlagam?

A

the box

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6
Q

Voids in amalgam are often due to

A

placing to much of it at once

and not getting it full condensed

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7
Q

Marginal Ridge should be carved at the ________ and should be _______

A
  1. same height as adjacent tooth
  2. perpeidcular to the long axis
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8
Q

T band is moslty used in

A

pedo

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9
Q

When do you polish amalagm?

A

when rough and at the recall appt

after 24hrs

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10
Q

Hydrodynamic theory

A

small fluild movements in tubules–> pain

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11
Q

removing the smear layer

A

gives stronger bond

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12
Q

irreversible pulpitis

A

sponateous pain or irritaint that last more than 15secs

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13
Q

Order of hardness

A

cementum < denitn < enamel

outer dentin is harder than inner (deep)

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14
Q

What structure does this define: gray in color, shiny, semitransluecent.

A

Enamel

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15
Q

What is the smear layer?

A

the surface of denitn when cut.

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16
Q

What is not true about enamel?
a. Enamel rods at largest at the DEJ and smallest at the external tooth surface
b. Enamel solubility increases closer to the DEJ
c. Enamel tufts are hypomineralized
d. Enamel has high strength but is very brittle
e. All of the above are true

A

a. Enamel rods at largest at the DEJ and smallest

they are smallest there

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17
Q

Below what distance is it acceptable to connect two separate preparations together?
a. 0 mm
b. 0.5 mm
c. 0.75 mm
d. 1 mm
e. 2 mm

A

b. 0.5 mm

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18
Q

Tooth preparations work to repair damage while preserving tooth vitality. They are also designed to prevent tooth fracture.

a. Both statements are false
b. The first statement is true, the second statement is false
c. The first statement is false, the second statement is true
d. Both statements are true

A

d. Both statements are true

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19
Q

The _________ is parallel to the long axis of the tooth, while the _________ is perpendicular to the long axis of the tooth.

a. Axial wall, pulpal floor
b. Gingival floor, pulpal floor
c. Axial wall, lingual wall
d. Gingival wall, axial wall e. Buccal wall, lingual wall

A

a. Axial wall, pulpal floor

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20
Q

True/False: the axiopulpal line angle, found in Class II preparations, is an internal line angle.
a. True b. False

A

true

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21
Q

T/F A Class V preparation is a smooth surface preparation on the gingival third of a buccal surface. A buccal pit is an example of a Class V preparation.
a. Both statements are true.
b. Both statements are false.
c. The first statement is true, the second statement is false.
d. The first statement is false, the second statement is true.

A

c. The first statement is true, the second statement is false.

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22
Q

What is not important when forming an amalgam preparation?
a. Having a smooth and flowing outline
b. Conserving cusps and ridges to maintain resistance
c. Creating converging walls to maintain retention
d. Placing the restoration in a location that is easily accessible
e. All of the above are important in forming a preparation

A

All of the above are important in forming a preparation

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23
Q

What features of an amalgam preparation will prevent rotation of the restoration?
a. Preserving marginal ridges
b. Sharp line angles
c. A flat pulpal floor
d. Smooth and flowing outline

A

c. A flat pulpal floor

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24
Q

What is true regarding enameloplasty?
a. No more than 1⁄2 of enamel thickness should be removed
b. Carbide burs are primarily used
c. Deep pits are destroyed to prevent decay
d. It causes pain to the patient, so anesthetics are used
e. None of the above are true

A

c. Deep pits are destroyed to prevent decay

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25
Q
  1. In a buccal pit preparation, which wall/portion is not converging?
    a. Gingival wall
    b. Axial wall
    c. Mesial wall
    d. Distal wall
    e. Apex
A

e. Apex

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26
Q
  1. When is an amalgam restoration
    contraindicated?
    a. A patient with heavy occlusal wear
    b. A patient who has never had caries, yet present with a small pit/fissure lesion
    c. A patient with a Class V preparation on her mandibular second molar
    d. A patient who has a large lesion on a tooth that might need to be removed e. Amalgam can be used on any of these patients
A

b. A patient who has never had caries, yet present with a small pit/fissure lesion

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27
Q

True/False: if a Class V preparation needs to go interproximally, enamel should be removed with a round bur, then undermined enamel should be removed with a gingival margin trimmer.

A

True

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28
Q

In a Class I preparation, diverging walls should be at an angulation of 5-8 ̊. When a wall
is not diverging, it should be parallel to the long axis of the tooth.
a. Both statements are true
b. The first statement is true, the second statement is false
c. Both statements are false
d. The first statement is false, the second statement is true

A

Both statements are false

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29
Q

Why is sharpening instruments important for tooth preparations?
a. Sharp instruments require more pressure to use
b. Dull instruments have less control
c. Sharp instruments cause less pain
d. A and B
e. B and C

A

e. B and C

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30
Q

A specific hatchet has the following Instrument formula: 12 - 75 - 10 - 60. The cutting
edge is ____ wide and the blade angulation is ____ of 360 ̊, in relation to the long axis of the handle.
a. 12 mm, 75%
b. 1.2 mm, 60%
c. 12 mm, 10%
d. 1 mm, 60%
e. 1 mm, 75%

A

b. 1.2 mm, 60%

31
Q

The cutting edge of a cutting instrument is similar to the face of a non-cutting
instrument,
just as the blade of a cutting instrument is similar to the ________ of a non- cutting instrument.
a. Nib
b. Blade
c. Shank
d. Handle
e. Edge

A

a. Nib

32
Q

What is true regarding sterilization of instruments?
a. The only time an instrument needs to be sterilized when sharpened is
immediately before sharpening
b. Chemiclave systems require proper ventilation
c. Autoclaves use dry heat to rid instruments of microbes
d. A and B

A

b. Chemiclave systems require proper ventilation

33
Q

What is the most common type of caries?
a. Smooth surface
b. Root
c. Recurrent
d. Pit/Fissure
e. Incipient

A

d. Pit/Fissure

34
Q

Class I lesions are best detected by ________. Class II lesions are best detected by
____________ _.
a. Periapical radiographs, bitewing radiographs
b. Visual-tactile examination, periapical radiographs
c. Bitewing radiographs for both
d. Visual-tactile examination, bitewing radiographs
e. Visual-tactile examination for both

A

d. Visual-tactile examination, bitewing radiographs

35
Q

When present, which type of lesion is the best indicator of a person with a high caries rate?
a. Class I
b. Class II
c. Class IV
d. Class V
e. Class VI

A

d. Class V

is near ging

36
Q

What is the role of saliva in caries prevention?
a. Uses CaOH as a buffer to raise pH
b. Strengthens enamel rods
c. Creates a barrier over pits and fissures, preventing the collection of sugars
d. Flushes out bacteria and food debris from the oral cavity
e. None of the above

A

d. Flushes out bacteria and food debris from the oral cavity

37
Q

Which oral bacteria is cariogenic, but usually inhibits the growth of S. mutans?
a. Streptococcus mitis
b. Streptococcus sanguis
c. Lactobacillus
acidophilus
d. Bacteroides melaninogenicus
e. Streptococcus inhibans

A

a. Streptococcus mitis

38
Q

High amounts of _________ in pits and fissures cause caries in 6 to 24 months.
a. Carbohydrates
b. Sealants
c. S. mutans
d. Amalgam
e. Saliva

A

c. S. mutans

39
Q

Both enamel and dentin will demineralize at a pH of 5.4. After each exposure to carbohydrates, the pH can remain low for up to one hour.

a. Both statements are true
b. The first statement is true, the second statement is false
c. Both statements are false
d. The first statement is false, the second statement is true

A

a. Both statements are true

40
Q

What is true about both liners and bases?
a. They stimulate reparative dentin
b. They can only be placed in the center of preparations
c. They can release fluoride
d. They seal dentin tubules
e. They are used in preparations of any depth

A

b. They can only be placed in the center of preparations

41
Q

The axial wall of a Class II preparation should be:
a. Concave and parallel to the long axis of the tooth b. Concave and perpendicular to the long axis of the tooth
c. Flat and parallel to the long axis of the tooth
d. Convex and perpendicular to the long axis of the tooth
e. Convex and parallel to the long axis of the tooth

A

e. Convex and parallel to the long axis of the tooth

42
Q

What is the purpose of the Reverse S-curve in a Class II preparation?
a. Keeps the narrow isthmus away from the axiopulpal line angle
b. Allows the preparation to break buccal contact c. Creates a smooth and rounded outline
d. Allows the buccal wall to be 90 ̊ to the cavosurface margin
e. All of the above

A

e. All of the above

43
Q

Which of the following is not true regarding dental biomaterials?
a. Drugs used in dental procedures are not considered biomaterials
b. An allergic reaction falls under a biological response to a biomaterial
c. Physical properties depend on the size and shape of the material
d. Biomaterials are classified by their biological, surface, physical, and mechanical properties
e. All of the above are true

A

c. Physical properties depend on the size and shape of the material

44
Q

The greatest strength of dental materials is usually _________ strength, while the weakest strength is ________ strength.
a. Tensile, shear
b. Compressive, tensile
c. Shear, torsion
d. Compressive, flexural
e. Flexural, tensile

A

b. Compressive, tensile

45
Q

Does premature occlusal contact increase or decrease stress on the tooth, and why?

a. Increase, because the bite force will be greater during premature contact
b. Decrease, because the bite force does not change during premature contact
c. Increase, because the surface area contacted is smaller
d. Decrease, because the surface area contacted is smaller
e. Premature occlusal contact has no effect on stress

A

c. Increase, because the surface area contacted is smaller

46
Q

What type of stress is measured using a 3-point test?
a. Compressive
b. Tensile
c. Torsion
d. Flexural
e. Shear

A

d. Flexural

47
Q

The elastic limit delineates the transition from elastic strain to plastic strain. Brittleness a property caused by a lack of elastic deformation.
a. Both statements are true
b. The first statement is false, the second statement is true.
c. The first statement is true, the second statement is false.
d. Both statements are false

A

a. Both statements are true

48
Q

The final stress point, where a material will fracture, is known as its:
a. Strength
b. Elastic modulus
c. Resilience
d. Toughness
e. Fracture point

A

a. Strength

was listed in pp as fracture strength

49
Q

True/False: energy absorbed during elastic strain only is resilience, while energy absorbed during plastic strain only is toughness

A

True

50
Q

Which added element helps prevent expansion of amalgam?
a. Zinc
b. Silver
c. Tin
d. Copper
e. Palladium

A

a. Zinc

51
Q

The order of needed compression force for amalgams, from highest to lowest, is:

a. Lathe > admixed > spherical
b. Spherical > admixed > lathe
c. Lathe > spherical admixed
d. Spherical > lathe > admixed
e. Admixed > lathe > spherical

A

a. Lathe > admixed > spherical

52
Q

Which compound, when present in amalgam, causes weakness and corrosion?
a. Gamma (Ag3Sn)
b. Gamma-1 (Ag2Hg3)
c. Gamma-2 (Sn7Hg)
d. Eta (Cu6Sn5)
e. AgCu

A

c. Gamma-2 (Sn7Hg)

53
Q

Which of the following will increase the strength of amalgam?
a. Mercury content above 55%
b. Trituration for 1 minute
c. High copper content
d. Waiting 10 minutes between trituration and condensation to mature the amalgam
e. Leaving residual mercury in the restoration

A

c. High copper content

54
Q

Which of the following describes amalgam restorations compared to composite restorations?
a. Less recurrent decay b. Moisture sensitive
c. Lasts for a longer time
d. A and C
e. All of the above

A

d. A and C

55
Q

True/False: tarnishing and corrosion of amalgam changes the amount of material in a preparation

A

True

56
Q

What is not a cause of bulk fracture in an amalgam restoration?
a. Improper trituration
b. Premature occlusal contact
c. Improper handling/condensation
d. Fatigue of the material
e. All of the above cause bulk
fracture

A

e. All of the above cause bulk
fracture

57
Q

Enamal Tufts are

A

HYPOmineralized

58
Q

DEJ is a ______ zone

A

HYPOmineralized zone

59
Q

What is the largest portion of the tooth?

A

Dentin

60
Q

Where is the diameter of dentin tubules the largest?

A

At the pulp

more sensitive

61
Q

What forms reparative dentin?

A
  • Secondary odontoblasts
  • at surface if the pulp
62
Q

sclerotic dentin is

A

primary dentin that has changed because peritubular dentin widens and fills with calcififed

63
Q

Dentin is ____ as hard as enamel

A

1/5

64
Q

Dentin is ____ harder at DEJ than at the pulp

A

3x

65
Q

in enameloplasty no more than _______ is removed

A

1/3 enamel thickness

66
Q

dentin demineralizes at

A

6.2

67
Q

at what pH does demineralization begin?

A

5.5

68
Q

what tooth has an exception to path of entry?

A

mandibular first premolar

tilts lingually

69
Q

what is the main thing in amalgam that cause expansion when wet?

A

Zn

70
Q

what is the ideal depth a prep should be inside the dentin?

A

0.2-.05mm

71
Q

Materials with ______ bonds have high thermal/electrical conductivity, while materials
with ______ bonds have low thermal/electrical conductivity.
a. Metallic, covalent
b. Metallic, ionic
c. Covalent, ionic
d. Ionic, covalent
e. Ionic, metallic

A

a. Metallic, covalent

72
Q

Which of the following statements is true regarding dental materials?
a. Amalgams are strong because the level of stress required to fracture it is low
b. Elastomeric polymers have a higher elastic modulus, allowing it to bend easily
c. Composites have a low plastic strain, meaning they are brittle
d. Ceramics have a high strength value, meaning it is extremely tough
e. None of the above are true

A

c. Composites have a low plastic strain, meaning they are brittle

73
Q

One of your patients comes in with a chipped maxillary central incisor. He was hit with a
basketball in the face and the fracture removed the entire incisal edge and part of the mesial portion of the tooth. What type of restoration would be used to fix this tooth?

a. ClassI
b. Class III
c. Class IV
d. Class V
e. Class VI

A

c. Class IV

Operative 1 (15 decks)

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