Week 4 - Obturation Flashcards

(54 cards)

1
Q

When should obturation be performed?
A. After thorough disinfection and shaping
B. Before instrumentation
C. During access cavity preparation
D. After crown restoration

A

A

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2
Q

Which is NOT an aim of obturation?
A. Provide a nutrient supply
B. Seal the canal hermetically
C. Prevent reinfection
D. Fill the pulp space

A

A

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3
Q

What is a sign that obturation should be delayed?
A. Dry canal
B. Swelling or discharging sinus
C. Canal patency
D. Lack of instrumentation

A

B

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4
Q

A good root canal filling material should be:
A. Dimensionally stable
B. Easily soluble
C. Shrinkable
D. Transparent on radiograph

A

A

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5
Q

When should obturation be performed?
A. After thorough disinfection and shaping
B. Before irrigation
C. Before access cavity
D. After temporary restoration

A

A

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6
Q

What clinical finding would delay obturation?
A. Canal dryness
B. Swelling or discharging sinus
C. Radiographic healing
D. Closed apex

A

b

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7
Q

What is the goal of obturation?
A. To clean the pulp
B. To improve access
C. To provide a 3D hermetic seal
D. To block blood supply

A

C

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8
Q

Which is NOT an ideal property of root canal filling material?
A. Dimensionally stable
B. Shrinkable
C. Radio-opaque
D. Biocompatible

A

B

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9
Q

What material is commonly used to obturate canals?
A. Paper points
B. Gutta-percha
C. Resin cement
D. Composite

A

B

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9
Q

What is used to check canal dryness?
A. Spreaders
B. GP points
C. Paper points
D. Files

A

C

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10
Q

What defines the ‘master point’?
A. First point selected
B. Point matching the file size
C. Point with tug-back at working length
D. Shortest gutta-percha cone

A

C

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11
Q

What is tug-back?
A. Sudden movement during irrigation
B. Resistance when removing GP point
C. Resistance to file insertion
D. A radiographic finding

A

B

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12
Q
  1. What confirms correct placement of the master cone?
    A. Paper point absorption
    B. Radiograph reaching working length
    C. Sealer extrusion
    D. Increased canal moisture
A

b

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13
Q
  1. What is used to coat canal walls before placing GP?
    A. Chlorhexidine
    B. Alcohol
    C. Sealer paste
    D. EDTA
A

c

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14
Q
  1. Which material is primarily used for obturation?
    A. Gutta-percha
    B. Composite resin
    C. Calcium hydroxide
    D. Amalgam
A

A

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15
Q
  1. What tool creates space for accessory cones?
    A. Plugger
    B. Spreader
    C. Excavator
    D. Lentulo spiral
A

B

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16
Q
  1. A key property of root canal sealers is:
    A. Insolubility in tissue fluids
    B. Need for high temperature
    C. Shrinkage on setting
    D. Radiolucency
A

A

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17
Q
  1. What is a common cause of a void in the obturation?
    A. Use of zinc phosphate
    B. Incomplete condensation
    C. Sealer overfill
    D. Use of EDTA
A

B

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18
Q
  1. What is used to dry the canal before obturation?
    A. Gutta-percha
    B. Sealer
    C. Paper points
    D. Spreader
A

C

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19
Q
  1. Which instrument compacts GP laterally?
    A. Plugger
    B. Lentulo spiral
    C. Spreader
    D. Reamer
A

C

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20
Q
  1. What might happen if excessive pressure is applied with the spreader?
    A. Root fracture
    B. Poor condensation
    C. Underfilling
    D. GP over-softening
A

A

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21
Q
  1. The master cone should:
    A. Be randomly selected
    B. Fit loosely in canal
    C. Show tug-back
    D. Be shorter than working length
22
Q
  1. What is Tubliseal?
    A. A calcium hydroxide paste
    B. A type of sealer
    C. A GP accessory point
    D. An irrigation solution
23
Q
  1. What does a radiograph confirm after obturation?
    A. Instrument length
    B. Canal dryness
    C. Quality of the fill
    D. Tooth vitality
24
21. What helps achieve tug-back? A. Drying the canal B. Matching GP to file size C. Using a cotton pellet D. Applying heat
B
25
22. What is placed after excess GP is compacted coronally? A. Flowable composite B. RMGIC liner C. Temporary filling D. Gutta-percha plug
B
26
23. A short root filling is often caused by: A. Using too much sealer B. Incomplete seating of GP C. High-pressure compaction D. Overdrying
B
27
24. Which tool removes excess GP from the canal orifice? A. Cold spreader B. Heated plugger C. Lentulo spiral D. Excavator
B
28
25. What material is used to fill the pulp space during obturation? A. Resin-modified GIC B. Gutta-percha C. IRM D. MTA
B
29
26. Which factor can delay obturation? A. Canal dryness B. Absence of symptoms C. Discharging sinus D. Use of sealer
C
30
27. What is the purpose of a final working length radiograph? A. Assess obturation quality B. Detect caries C. Evaluate bone levels D. Check tooth alignment
A
31
28. What is an ideal working property of sealer? A. Quick setting in 30 seconds B. Radio-opacity C. Solubility D. Inflammation
B
32
29. What happens if a cone lacks tug-back? A. Better seal B. Loose apical fit C. Canal blockage D. Overfilling
B
33
30. What might be seen in an overfilled canal? A. GP flush with apex B. Sealer within canal only C. Extrusion beyond apex D. Short fill
C
34
31. Which obturation technique is shown by using a spreader and accessory cones? A. Warm vertical condensation B. Single cone technique C. Cold lateral condensation D. Carrier-based obturation Answer: C
C
35
32. Why is it important to work quickly when placing accessory cones? A. GP melts B. Sealer may over-harden C. GP rebounds due to elastic recoil D. Tooth may dry out
C
36
33. What material is used to coat both the canal walls and the master cone? A. Zinc phosphate B. Resin C. Sealer paste D. NaOCl
C
37
34. What is a disadvantage of fast-setting sealer? A. Enhanced flow B. Incomplete cone adaptation C. GP softening D. Canal blockage
B
38
35. Which step directly follows seating the master cone? A. Take final radiograph B. Apply Fuji liner C. Insert spreader D. Place cotton pellet
C
39
36. What indicates successful tug-back? A. Free-floating cone B. Slight resistance upon withdrawal C. GP slides easily D. Sealer overflow
B
40
37. What is the primary goal of obturation? A. To eliminate reinfection pathways B. To shape the canal C. To disinfect the pulp D. To aid tooth eruption
a
41
38. Which problem could result from poor condensation? A. Apex overfill B. Canal discoloration C. Voids in the filling D. Heat generation
c
42
39. What instrument is placed short of the working length during lateral condensation? A. Lentulo spiral B. Rubber dam C. Irrigation syringe D. Finger spreader
d
43
40. What is the function of RMGIC after obturation? A. Obturate lateral canals B. Seal the access cavity C. Lubricate the canal D. Fix master cone
B
44
41. Which condition suggests obturation should be postponed? A. Closed apex B. Dry canal C. Discharging sinus D. Radiographic success
C
45
42. What causes gutta-percha to bend during placement? A. Resistance to tug-back B. Cold canal temperatures C. Adaptation to curved canals D. Overuse of spreader
C
46
43. What confirms apical seal radiographically? A. Overfilled GP B. Cone short of apex C. GP reaching working length without voids D. Radiolucency near apex
C
47
44. If a cone easily dislodges, the likely reason is: A. Excessive drying B. Lack of tug-back C. Cone too short D. Overpressure from plugger
B
48
45. What does the final obturation radiograph assess? A. Pulp vitality B. Bone level C. Quality and length of fill D. Crown margin
C
49
46. Sealer extrusion beyond the apex is most likely caused by: A. Plugger overheating B. Fast setting C. Over-instrumentation D. Inadequate drying
C
50
47. Which filling condition is considered acceptable? A. GP 2 mm short of apex B. Voids present C. Sealer only D. GP 5 mm beyond apex
A
51
48. A sign of sealer setting too quickly is: A. Apical puff B. Cone won’t seat fully C. Heat generation D. Cone shrinkage
B
52
49. Why must the GP cone match the finishing file? A. Ensure snug fit and seal B. Improve radiopacity C. Increase irrigation D. Reduce post-op pain
A
53
50. What follows obturation before final restoration? A. Liner placement (e.g., Fuji liner) B. Use of irrigant C. Second shaping D. GP removal
A