7. obturation

questions asked in MCQs

1. OBTURATION

2. 1. The main objective of obturation is (PGI-
98)
a. Fill the canal and prevent apical
percolation of fluids
b. Fill the canal and prevent discolouration
of teeth
c. Fill the canal to give support to
restoration
d. All of the above

3. 2. Which of the following can be used as root
canal filling materials? (PGI-95)
a. Cements and plastic materials
b. G.P. Points
c. Silver points
d. All of the above

4. 3. Most commonly followed obturation
technique
a. Lateral condensation
b. Vertical condensation
c. Thermoplastic injection technique
d. Carrier based GP

5. 4. Mc Spadden compactor for thermo
mechanical compaction has flutes similar
to
a. Reverse of H-file
b. H-file
c. K-file
d. K-flex file

6. 5. Mc Spadden compactor is of _________
shape (AIIMS-97)
a. Reverse blade of K-file
b. Reverse blade of H-file
c. Endosonic instrument
d. None of the above

7. 6. ‘Hermetic seal’ literally denotes
a. Fluid-impervious seal
b. Bacteria impervious seal
c. Blood-impervious seal
d. Air-impervious seal

8. The achievement of a “hermetic seal” is
often cited as a major goal of root canal
treatment. According to accepted
dictionary definitions, the word hermetic
means sealed against the escape or entry
of air—or made airtight by fusion or
sealing. However, root canal seals are
commonly evaluated for fluid leakage—a
parameter used to praise or condemn
obturation materials and techniques.

9. This occurs both apically and coronally.
Somehow the term hermetic has crept into
endodontic nomenclature in a manner
probably quite similar to the invention of
an airtight seal. A god of wisdom, learning
and magic in ancient Egypt, Thoth, better
known as Hermes Trismegistus (Hermes
thrice greatest), is credited with this
invention.

10. His significant contribution to civilization
allowed the preservation of oils, spices,
aromatics, grains and other necessities in
previously porous, earthenware vessels. A
simple wax seal of the vessel walls helped
to create the “hermetic seal.”
Endodontically speaking, the term
hermetic is inappropriate; instead, terms

11. such as fluidtight, fluid-impervious, or
bacteria-tight seals are more
contemporary.

12. 7. Warm vertical compaction was
introduced by
a. Kuttler
b. Schilder
c. Vertucci
d. Pineda

13. 8. Vertical compaction of warm gutta-
percha technique, was given by? (AP-
2011)
a. Grossman
b. Ingle
c. Schilder
d. Cohen

15. 9. The best time for giving permanent
restoration after obturation is
a. 1 week after obturation
b. 1 month after obturation
c. 3 months after obturation
d. Immediately after obturation in the same
appointment

16. 10. About gutta-percha all are true, except
(AIIMS-05)
a. It contains 60-70% gutta-percha and 20%
ZnO
b. Can be sterilized by heating
c. With time they become brittle
d. It has two forms alpha and beta

17. 11. The largest component of gutta percha
cones is (UPSC-01, TNPSC-99)
a. Gutta percha
b. Zinc oxide
c. Resins and waxes
d. Colouring agents

18. 12. Gutta percha can be effectively sterilized
by (AIIMS-07)
a. Hot salt sterilizer
b. Autoclaving
c. Chemical solutions
d. Dry heat

19. 13.The most practical method to disinfect
GP is with
a. NaOCl
b. H
2
O
2
c Hot air oven
d. Glutaraldehyde

20. This can be done in 1 minute if the cone is
submerged in a 5% solution of Naocl.
After this the GP should be rinsed in ethyl
alcohol to remove crystallized Naocl
before obturation, such crystals impair
the obturation seal.

21. 14. Rejuvenation of aged gutta-percha is
done by
a. Immersion in hot water of 55
0
C
b. Immersion in hot water of 55
0
F
c. Immersion in hot water of 55
0
C, followed
by instant cooling in cold water
d. Immersion in hot water of 55
0
F, followed
by instant cooling in cold water

22. Gutta-percha becomes brittle with age, a
process hastened with warmth and
delayed when refrigerated. Sorin and
Oliet described this aging process and
introduced a technique to rejuvenate the
aged brittle gutta-percha by momentary
immersion in hot tap water of 550C,
followed by instant cooling in cold tap
water.

23. 15. The advantage of silver point as
obturating material is that it (KCET-2011)
a. Can be used in fine tortuous canals
b. Is easier to retrieve if retreatment becomes
necessary
c. Gives a perfect seal at the apical l/3rd of
the root canal
d. Provides better adaptation to canal walls
compared to Guttapercha

24. 16. Which one of the following is not a
popular method of root canal obturation
(TNPSC 2006)
a Lateral condensation
b. Silver point technique
c. Vertical condensation
d. Thermo-plasticized core filler technique

25. With the introduction of rigid silver cones it
became possible to easily place them to
length. This resulted in clinicians often
failing to properly clean and shape the
canal before obturation. Treatment
failures were the result of leakage and
failure to remove the irritants from the
root canal system. When silver points
contact tissue fluids or saliva, they
corrode.

26. The corrosion products have been found to
be cytotoxic and produced pathosis or
impeded periapical healing.The use of
silver cones today is considered to be
below the standard of care in
contemporary endodontic practice.

27. 17. Which of the following Is Incorrect
regarding the use of silver points for root
canal obturation (AIIMS-2K, 01)
a. Silver corrodes in tissue fluids
b. A post cannot be used if a silver point is
cemented in root canal

28. c. The use of step back method of root canal
preparation in a circular configuration is
difficult to achieve in the apical segment
with silver point
d. It will not seal the middle and cervical
parts

29. Split Cone Technique
A variation of the silver cone technique was
employed where a post was needed to
support a coronal restoration. This
variation had been presented under many
names, but it was usually recognized as
the split cone technique. The silver cone
was fitted carefully.

30. Before cementation, however, the cone was
scored deeply with a disk or bur at some
distance from its apical end. Cementation
proceeded, but after the cone had been
seated well, its coronal end was rotated
repeatedly along its long axis. While
rotating, firm apical pressure was applied
through the pliers to prevent unseating at
the root apex.

31. As the rotary motion continued, the cone
would be severed at the score line and all
but the apical portion was removed. The
middle and coronal parts of the canal
were available for a post.

32. 18. Which of the following best describes the
resistance form in endodontic root canal
preparation? (AIIMS-06)
a. The establishment of apical tug back resistance to
prevent the apical root fracture during obturation
b. The cavity form which is obtained for application of
condenser in vertical compaction
c. The cavity form which is obtained for application of
condenser in lateral compaction
d. Cavity form which is designed to obtain for entry of
condenser during obturation

33. 19. Lentulo spirals are endodontic
instruments used for (TNPSC 2006)
a. Exploration
b. Debridement
c. Cleaning and shaping
d. Obturation

34. 20. The primary gutta-percha cone must fill
the canal wall tightly in the: (COMED-05,
AP-05)
a. Apical third
b. Middle third
c. Cervical third
d. Entire canal

35. 21. The technique of obturation for open
apex
a. Warm vertical condensation
b. Thermoplastisized injection technique
c. Lateral condensation
d. Roll cone technique

37. 22. J. S. Quickfill is (COMDEK-08)
a. The original engine driven McSpadden's
compactor with guttapercha already
coated
b. Like thermafill another obturator
c. No different than original Mcspadden's
compactor
d. Chemically softened gutta-percha

38. J.S. Quick-Fill system consists of titanium
core devices that come in ISO sizes 15 to
60, resemble latch-type endodontic drills,
coated with alpha-phase gutta-percha.
These devices are fitted to the prepared
root canal and then, following the sealer
placement, are spun in the canal with a
regular low-speed, latch-type handpiece.

39. Frictional heat plasticize the gutta-percha
and it is compacted to place by the design
of the Quick-Fill core. After compaction,
there are two choices: either the
compactor may be removed while it is
spinning and final compaction completed
with a hand plugger or the titanium solid
core may be left in place and separated in
the coronal cavity with an inverted cone
bur.

40. 23. In Endodontics Endotec is used
(COMEDK-08)
a. With lateral condensation and heated
gutta percha
b. With cold lateral compaction
c. With vertical compaction
d. With Chlorapercha Technique

41. Considering the ease and speed of lateral
compaction as well as the superior density
gained by vertical compaction of warm
gutta-percha, Martin developed a device
that appears to achieve the best qualities
of both techniques called Endotec II. The
device is a battery powered, heat-
controlled spreader/plugger that ensures
complete thermo-softening of any type of
gutta-percha.

42. It is claimed that the “Endotec combines the
best of the two most popular obturation
techniques: warm/vertical and the relative
simplicity of lateral compaction”. Canal
cleaning and shaping for this technique is
a continuous taper design with a definite
apical stop. The warm lateral compaction
technique involves adapting a master cone
in the same manner as with traditional
lateral compaction.

43. An appropriate-size Endotec II tip is
selected. Endotec II tips are available in
various taper and tip diameters. The sizes
consist of #.02/20 ,30 and #.02/40. The
device is activated and the tip is inserted
beside the master cone to within 2 to 4 mm
of the apex, using light pressure. The tip is
rotated for 5 to 8 seconds and removed.
An unheated spreader can be placed in the
channel created to ensure

44. adaptation and then an accessory cone is
placed. The process is continued until the
canal is filled.

45. 24. High heat obturation technique refers to
(KAR-02)
a. Thermofill technique
b. Ultrafil technique
c. Sectional filling
d. Obtura II technique

47. 25. Thermafil is (COMEDK-08)
a. An endodontic obturator
b. An enlarging instrument
c. An instrument to remove pulp
d. Is a cold gutta percha technique

49. 26. Wiggly appearance of master cone in the
apical third of IOPA is due to (AIPG-07)
a. Extrusion of sealents.
b. Master cone not reaching the apical third
due to any obstruction.
c. Smaller sized master cone.
d. Inadequate coating of sealent.

50. If the cone goes to length and
radiographically exhibits a wiggly or S-
shaped appearance, the cone is too small
for the canal and a larger cone must be
selected.

51. 27. When is an application of heated Injected
gutta percha potentially beneficial
(COMDEK-08)
a. When there is an open apex
b. When there are aberrations or
irregularities of the canal
c. When the clinician cannot master lateral
condensation
d. When the canals are curved and small
after preparation

52. 28. Best material for obturating a root canal
of a tooth is (PGI-2K)
a. Thermoplastic GP
b. Silver cone
c. Resobable paste
d. GP with sealer

53. 29. G.P. is plasticized (softened) by (AP-01)
a. Alcohol
b. Choroform
c. Eugenol
d. EDTA

54. 30. Bismuth compounds are incorporated in
root canal filling materials because they
are: (AIPG-89)
a. Radio-opaque
b. Germicidal
c. Radiolucent
d. Adhesive

55. 31. Gutta-percha is radio-opaque due to
presence of: (AIPG-99)
a. Zinc oxide eugenol
b. Barium sulphate
c. Potassium sulphate
d. Barium oxide

56. Heavy metal sulphates are added as radio-
opacifier to GP.

57. 32. Main cause of failure of endodontic
therapy: (PGI-98, 02 ; AP-04)
a. Improper biomechanical preparation
b. Improper access cavity preparation
c. Incomplete obturation
d. Over extended filing

58. 33. An apical radiolucent are present in
central incisor after 4 months of RCT is
due to: (AIIMS-97)
a. Inadequate obturation & leakage from
main canal
b. Leakage from accessory canal
c. Leakage from gingival crevice
d. Leakage from access opening

59. 34. The purpose of a root canal sealer is to
(AIPG 99, PGI 99)
a. Seal the tubules of the dentin
b. Stimulate healing in periapical region
c. Prevent discolouration
d. Fill the space between the solid core
material and the pulp canal walls

60. Root canal sealers are necessary to seal the
space between the dentinal wall and the
obturating core interface.

61. 35. Endo sealer containing polyketone is
(AP-2K, 03)
a. Diaket
b. Cavit
c. Ah 26
d. Hydron

62. 36. Which is not a eugenol sealer? (AIPG-
07)
a. Grossman sealer
b. AH-26
c. Tubli seal
d. Wach's paste

64. Kerr Pulp Canal Sealer, Pulp Canal Sealer
EWT (Extended Working Time),
Procosol, Roth’s Sealer, Tubliseal, Wach’s
Cement are various Zinc-oxide eugenol
sealers. Nogenol was developed to
overcome the irritating quality of eugenol.
The product is an outgrowth of a non-
eugenol periodontal pack. AH-26 is a
epoxy resin based root canal sealer.

65. 37. Which of the following is urethane
dimethacrylate (UDMA) resin based
endosealer? (AIIMS-09)
a. Endorez
b. Real seal
c. Raeko sealer
d. Tubli seal

66. 38. All are true for root canal sealer except:
(AIPG-07)
a. Excessive use of sealer tends to extrusion in
periapical areas
b. Sealer mediates immune reaction in
periapical region
c. Loss of sealer causes porosity between root
filter and tooth surfaces
d. Sealer occupies the space between root
filler and tooth surfaces

67. 39. After root canal filling the apical
foramen is closed by: (AIPG-07)
a. Dentin deposition
b. Cementum deposition
c. Never closed
d. Root canal material

68. 40. The crown of an RC treated tooth is
fractured near the gingival margin. The
coronal end of the silver cone used in
filling that canal is visible at that level.
Treatment is: (AIPG-02)
a. To prepare post space alongside the silver
cone using burs and Peso reamers
b. To grind away the coronal part of silver
cone using round burs or end cutting burs

69. c. To remove the silver cone and re-treat the
canal using a gutta-percha; and then to
create the needed post space
d. To remove the silver cone, notch it, coat it
with a freshly mixed sealer replace it in
the canal and twist off the coronal
segment