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Endodontics > Endo Quiz Questions > Flashcards

Endo Quiz Questions Flashcards

1
Q

An apexification procedure relies on maintenance of a vital pulp to promote continued root development…True or False?

A

False

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2
Q

Following trauma where the tooth loses blood supply to the pulp, the open apex tooth can reestablish a blood supply through the process called “revascularization” - True or False?

A

True

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3
Q

MTA promotes faster tertiary dentin formation than CaOH - True or False?

A

True

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4
Q

A 7 year old pt presents with a horizontal crown fx with pulp exposure that occurred two days ago. After a thorough assessment, you determine that a Cvek pulpotomy is indicated. How much pulp tissue should you resect?

A

2 mm

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5
Q

For “immediate” apexification, how do you prevent apical extrusion of obturation material?

A

Place collagen/collaplug

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6
Q

List 3 contraindications to Cvek pulpotomy…

A
  1. Tooth is unrestorable/Vertical Root Fx
  2. Cannot Control Bleeding
  3. Necrotic Pulp
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7
Q

What is the average success rate of a Cvek Pulpotomy?

A

96%

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8
Q

Long Term CaOH Apexification can decrease the fx resistance of the tooth. T or F?

A

True

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9
Q

List 3 advantages of Apexogenesis…

A
  1. Help form apex
  2. Increase root length
  3. Increase thickness
  4. Maintain vitality
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10
Q

List 3 required components for Regenerative Endodontics…

A
  1. Stem Cells
  2. Growth Factors
  3. Scaffold
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11
Q

Root canal treatment is recommended following apexogenesis (maturogenesis). T or F?

A

False

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12
Q

Ellis Class II Fx is the same as…

A

Uncomplicated Crown Fracture

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13
Q

List at least 4 risk factors for tooth fracture…

A
  1. Heavy bruxor, history of attrition
  2. Large Restorations
  3. Caries
  4. Unsupported enamel/Cusps
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14
Q

Which two permanent teeth have the highest incidence of tooth fractures?

A

Mandibular 1st and 2nd molars

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15
Q

What are the two most common symptom reported by patients who have a tooth with an incomplete fracture?

A
  1. Pain on biting

2. Thermal (Cold Sensitive)

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16
Q

List two findings (clinical or radiographic) that would make you suspicious of a vertical root fracture.

A
  1. “J” shaped lesion radiographically

2. Isolated DEEP PD

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17
Q

List the various luxation injuries from most severe to least severe…

A

Intrusion - Lateral Trusion, Extrusion, Sub Luxation, Concusion

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18
Q

List 4 potential sequelae of luxation injury. Circle the one that represents the most likely outcome of an intrusive luxation injury.

A
  1. Pulp Necrosis (Circled)
  2. Pulp Obliteration
  3. External Resorption (Surface)
  4. Ankylosis (Replacement Resorption)
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19
Q

“Baseline” vitality testing is only needed when the severity of the injury is likely to result in pulpal necrosis. T or F?

A

False

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20
Q

A tooth suffered a traumatic injury and pulp canal obliteration is noted on a 6 month recall radiograph. Pulpectomy and endodontic therapy should be initiated ASAP. T or F?

A

False

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21
Q

A root fx can occur in various location along a root. Which of the following would carry the most favorable prognosis?

A

Apical Third

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22
Q

Once a root fracture is detected, endodontic treatment of the coronal segment should be initiated ASAP. T/F?

A

False

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23
Q

Pulp testing of recently traumatized teeth may…

A

Facilitate a timely diagnosis of pulpal necrosis at subsequent visits

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24
Q

Following traumatic injury to a tooth, patients may present with clinical signs of ankylosis, which may include…

A
  1. Infraposition
  2. High-Pitch sound elicited upon percussion
  3. Lack of Mobility
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25
Q

What is the pH of Calcium Hydroxide?

A

11

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26
Q

What properties are associated with NaOCl?

A
  1. Antibacterial
  2. Deodorizer
  3. Lubricant
  4. Dissolves Tissue
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27
Q

What properties are associated with EDTA?

A
  1. Lubricant

2. Removes Smear Layer

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28
Q

What properties are associated with 2% CHX?

A
  1. Antibacterial

2. Lubricant

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29
Q

Replacement resorption occurs after minor injury to PDL and cementum and is usually self-limiting. T/F?

A

False

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30
Q

All pulps in avulsed teeth with mature apices will undergo necrosis. T/F?

A

True

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31
Q

An avulsed tooth with <60 min dry time should be splinted for up to 2 weeks. T/F?

A

True

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32
Q

Following replantation, all permanent teeth with immature roots require initiation of RCT within 2 weeks.

A

False

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33
Q

In the treatment of avulsion, how should the tooth be placed into the socket?

A

Digital Pressure

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34
Q

Circle the group of avulsed teeth that should be soaked in Fluoride (following removal of PDL) prior to replantation.

A

Mature root with > 60 minutes dry time

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35
Q

Underline the group of avulsed teeth that should be soaked in a doxycycline solution prior to replantation.

A

Immature root with < 60 minutes dry time

36
Q

Number the following storage media for avulsed teth in order from best #1 to worst #5

A
  1. Tooth Socket
  2. Hank’s Solution
  3. Milk
  4. Saliva
  5. Tap Water
37
Q

Replacement resorption occurs after minor injury to PDL and cementum and is usually self-limiting. T/F?

A

False

38
Q

Little Johnny had #9 avulsed while jumping from 1 bunk bed to another. #9 was out of the mouth for 10 minutes until mom could get a cup of tap water to place it in. The tooth was out of the mouth for 10 minutes before being placed in a cup of milk. It took mom 2.5 hours from the time of the trauma to get to your office with Johnny. What is the dry time for tooth #8?

A

10 minutes

39
Q

An asymptomatic anterior tooth exhibiting discoloration, pulp canal obliteration (calcific metamorphosis), normal periapex, and no response to cold or EPT should have root canal therapy followed by non-vital bleaching. T/F?

A

False

40
Q

What chemical is principally used in the walking bleach technique?

A

Sodium Perborate

41
Q

List two intrinsic and two extrinsic etiologies for discoloration of a clinical crown.

A

Intrinsic: tetracycline, pulp tissue/debris
Extrinsic: Coffee, Wine

42
Q

What factors play a role in the development of post-bleaching cervical resorption?

A
  • Use of heat during bleaching process
  • Use of 30% H202 (Superoxol)
  • Pre-existing gap at the CEJ (enamel and cementum don’t meet
  • History of trauma
43
Q

For the “walking bleach” technique, the protective barrier over the obturation material should at ? thick and located ? to the proximal CEJs

A

2 mm thick

At the proximal CEJs

44
Q

What are the treatment options for post-bleaching cervical resorption?

A
  • Calcium Hydroxide
  • Orthodontic Extrusion
  • Periodontal Surgery
  • Extracation
45
Q

After viewing an irregularly shaped moth eaten radiolucency located in the middle third of #8 a second X-ray was taken with the tube head positioned to the distal. The lesion in the xr moved to the distal. What type of resorption is it? And where is it located by all lingually?

A

External, lingual

46
Q

A tooth has normal pulp and normal apical tissues but does not respond to cold or pet. What are some potential causes?

A

Recent trauma
Calcified canal
Crown
Inadequate contact

47
Q

A PT complains of continuous spontaneous pain in the right posterior mandible that is greatly exaggerated with cold stimulation. An xr reveals that tooth #30 has had prev Endo. The obturation has poor length taper and density. Pas encompass both root spices of 30. Time is limited. What is the next best step to treat this patient.

A

Pulp vitality tests of 28-31

48
Q

Can you have asymptomatic irreversible pulpitis and asymptomatic apical periodontitis?

A

No

49
Q

Which resorption usually appears with the root canal walls clearly delineated and visible within the radiolucency of the resorption area

A

External

50
Q

A PT presents with sinus tract apical to #14. There is no swelling or pain. Tooth 14 does not respond to cold or electric pulp testing. What is the dx?

A

Necrotic and chronic apical abscess

51
Q

30 had root canal treatment 2 years ago. The PT complains of severe biting tenderness. An xr reveals per radiolucency at the m root apex. Fluctuate swelling is present. Dx?

A

Prev treated, acute apical abscess

52
Q

A PT presents to sick call with tooth ache. Cold testing 9 exhibits extreme pain that lingers for 30 sec. xr reveals compost res close to pulp of 9 but no per lesion. No percussion or palpation. What is dx?

A

Symptomatic irreversible pulpitis, normal apex

53
Q

Are antibiotics appropriate for irreversible pulpitis

A

No

54
Q

What % of max 1 molars have 4 canals?

A

75%

55
Q

Man 1 molars have 4 canals what % of time

A

30-60

56
Q

Man 1 premolars have 2 canals what % of time

A

25%

57
Q

What weine class has two merging into one

A

II

58
Q

What weine class has single canal from orifice to foramen

A

I

59
Q

What weine class has One canal dividing into two

A

Iv

60
Q

What weine class has two canals that stay separate the whole length

A

Iii

61
Q

The anatomical point that is generally accepted as the proper location to the end root canal preparation and obturation is called

A

Apical constriction

62
Q

Define the law of the cej

A

The cej is the most consistent landmark to locate the pulp chamber

63
Q

Law of centrality

A

The pulp is in the center of the tooth at the cej

64
Q

4 gates glidde. Corresponds to what iso file size

A

110

65
Q

2 peso reamer corresponds to what iso file size

A

90

66
Q

The average diameter of the minor foramen is equal to what size file

A

30

67
Q

The minor foramen relationship to the radiographic apex is what

A

.5-1.0 mm short of radiographic apex is

68
Q

The most common direction of perforation while accessing anterior teeth is…

A

To the facial

69
Q

Give 2 reasons why you should rem car and faulty res at the time of access

A

Ensure restorability

Make sure res material and car debris doesn’t fall into canals

70
Q

Which local anes is considered long acting

A

.5% bupivacaine with 1:200,000 epi

71
Q

What are 3 advantages of gow gates

A

Consistent landmarks
Low incidence of trismus
Low positive aspiration rate

72
Q

One of the cardiovascular effects of an intraosseous injection using a local anes with a vasoconstrictor is an increase in blood pressure true or false

A

False

73
Q

What are the contraindications for intraosseous injection

A

Root proximity
Acute site of infection
Site for potential incision and drainage

74
Q

What is the direction and degree of motion in the cutting motion of balanced force technique

A

Counter clockwise 180-270

75
Q

What are three things that can cause canal to become legged or transported

A

 Insufficient access cavity extension
 Poor control of file insertion length
 Use of end-cutting files
 Attempting to achieve too large a MAF size
 Failure to recapitulate
 Excessive axial (in-out) filing in a curve
 Insufficient irrigation
 Dentinal mud at apex

76
Q

Which anes technique requires anesthetic with vasoconstrictor for effectiveness

A

Pdl

77
Q

Which anes technique can use saline for the anes

A

Pulp all injection

78
Q

Advantages of niti rotary files

A 
Enlarge canal that has been 
negotiated to length 
Create smooth continuous taper 
Reduce operator fatigue 
Reduce time of instrumentation 
Instrument long sweeping curves
79
Q

Disadvantages of niti rotary

A

Cost
Break without warning
Unable to negotiate complex anatomy
Negotiate calcified canals

80
Q

T or f: torsional fracture occurs when a portion of the instrument locks while the shaft continues to rotate

A

T

81
Q

T or f: cyclic fatigue is a repeated result of repeated flexural stresses as a file rotates around a curvature

A

T

82
Q

T or f cyclic fatigue occurs abruptly and occurs more in smaller file sizes

A

F

83
Q

What component is main I. Gotta percha nad Roth root canal cement

A

Zinc oxide

84
Q

Can obturation overcome inadequate cleaning and shaping of a canal system?

A

No

85
Q

Situations where single visit Endo therapy might be recommended

A

Tooth is asymptomatic
 Root canal system is dry
 No signs of active infection
 Canals are Free of bacteria
 Time permits

86
Q

Which is more important for determining the stress on a rotary file, degree of canal curvature or radius

A

Radius

87
Q

What does apical clearing accomplish

A

technique that involves enlargement of the apical preparation followed by dry reaming to remove dentin debris and to produce a more defined apical stop.

Endodontics (9 decks)

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