DENT 90079 EXAM QUESTIONS WITH ANSWERS 1
2022/2023
1. For lower premolars, the purpose of inclining the handpiece
lingually is to
A. Avoid buccal pulp horn
B. Avoid lingual pulp horn
C. Remove unsupported enamel
D. Conserve lingual dentine
2. For an amalgam Restoration of weakened cusp you should
A. Reduce cusp by 2mm on a flat base for more resistance
B. Reduce cusp by 2mm following the outline of the cusp
C. Reduce 2mm for retention form
3. Before filling a class V abrasion cavity with GIC you should
A. Clean with pumice, rubber cup, water and weak acid
B. Dry the cavity thoroughly before doing anything
C. Acid itch cavity then dry thoroughly
4. Which of the following statement about the defective margins
of amalgam restoration is true?
A. The larger the breakdown, the greater the chance of decay.
5. The retention Pin in an amalgam restoration should be placed
A. Parallel to the outer wall
B. Parallel to the long axis of tooth
6. The most common cause of failure of the IDN “Inferior Dental
Nerve” block is
A. Injecting too low
B. Injecting too high
7. Which one of the following are not used in water fluoridation
A. SnF2
B. 1.23% APF
C. H2SiF2
D. CaSiF2
E. 8% Stannous fluoride
8. The best way to clean cavity before the placement of GIC is
,DENT 90079 EXAM QUESTIONS WITH ANSWERS 1
2022/2023
A. H2O2
B. Phosphoric Acid
C. Polyacrylic acid
, 2
9. The most mineralised part of dentine is
A. Peritubular dentine
10. A 45 year old patient awoke with swollen face, puffiness
around the eyes, and oedema of the upper lip with redness and
dryness. When he went to bed he had the swelling, pain or
dental complaints. Examination shows several deep silicate
restorations in the anterior teeth but examination is negative
for caries, thermal tests, percussion, palpation, pain, and
periapical area of rarefaction. The patient’s temperature is
normal. The day before he had a series of gastrointestinal x-
rays at the local hospital and was given a clean bill of health.
The condition is
A. Acute periapical abscess
B. Angioneurotic oedema
C. Infectious mononucleosis
D. Acute maxillary sinusitis
E. Acute apical periodontitis
11. Internal resorption is
A. Radiolucency over unaltered canal
B. Usually in a response to trauma
C. Radiopacity over unaltered canal
12. On replantation of an avulsed tooth could see
A. Surface resorption, external resorption
B. Internal resorption
C. Inflammatory resorption
D. Replacement resorption
E. A, C and D
F. All of the above
13. The percentage of total dentine surface dentinal tubules make
in 0.5mm away from pulp is
A. 20%
B. 50%
14. The junction between primary and secondary dentine is
A. A reversal line
B. Sharp curvature
C. A resting line
D. A reduction in the number of tubules
, 3
15. What is the correct sequence of events
A. Differentiation of odontoblast, elongation of enamel epithelium,
dentine formation then enamel formation.
B. Differentiation of odontoblast, dentine formation then enamel
formation, elongation of enamel epithelium.
C. Elongation of enamel epithelium, differentiation of odontoblast,
dentine formation then enamel formation.
16. What is the sequence from superficial to the deepest in
dentine caries
A. Zone of bacterial penetration, demineralisation, sclerosis, reparative
dentine
B. Zone of bacterial penetration, reparative dentine, demineralisation,
sclerosis.
C. Zone of bacterial penetration, sclerosis, reparative dentine,
demineralisation.
17. The nerve supply of the pulp is composed of which type of
nerve fibres
A. Afferent & sympathetic
18. In which direction does the palatal root of the upper first
molar usually curve towards
A. Facial / buccal/
B. Lingual
C. Mesial
D. Distal
19. What is the common appearance of vertical tooth fracture
A. Perio abscess like appearance
B. Displacement of fragments
20. Which of the following would be ONE possible indication for
indirect pulp capping
A. Where any further excavation of dentine would result in pulp exposure.
B. Removal of caries has exposed the pulp
C. When carious lesion has just penetrated DEJ
21. Following trauma to tooth, the next day there was no
response to pulp tests you should
A. Review again later
2022/2023
1. For lower premolars, the purpose of inclining the handpiece
lingually is to
A. Avoid buccal pulp horn
B. Avoid lingual pulp horn
C. Remove unsupported enamel
D. Conserve lingual dentine
2. For an amalgam Restoration of weakened cusp you should
A. Reduce cusp by 2mm on a flat base for more resistance
B. Reduce cusp by 2mm following the outline of the cusp
C. Reduce 2mm for retention form
3. Before filling a class V abrasion cavity with GIC you should
A. Clean with pumice, rubber cup, water and weak acid
B. Dry the cavity thoroughly before doing anything
C. Acid itch cavity then dry thoroughly
4. Which of the following statement about the defective margins
of amalgam restoration is true?
A. The larger the breakdown, the greater the chance of decay.
5. The retention Pin in an amalgam restoration should be placed
A. Parallel to the outer wall
B. Parallel to the long axis of tooth
6. The most common cause of failure of the IDN “Inferior Dental
Nerve” block is
A. Injecting too low
B. Injecting too high
7. Which one of the following are not used in water fluoridation
A. SnF2
B. 1.23% APF
C. H2SiF2
D. CaSiF2
E. 8% Stannous fluoride
8. The best way to clean cavity before the placement of GIC is
,DENT 90079 EXAM QUESTIONS WITH ANSWERS 1
2022/2023
A. H2O2
B. Phosphoric Acid
C. Polyacrylic acid
, 2
9. The most mineralised part of dentine is
A. Peritubular dentine
10. A 45 year old patient awoke with swollen face, puffiness
around the eyes, and oedema of the upper lip with redness and
dryness. When he went to bed he had the swelling, pain or
dental complaints. Examination shows several deep silicate
restorations in the anterior teeth but examination is negative
for caries, thermal tests, percussion, palpation, pain, and
periapical area of rarefaction. The patient’s temperature is
normal. The day before he had a series of gastrointestinal x-
rays at the local hospital and was given a clean bill of health.
The condition is
A. Acute periapical abscess
B. Angioneurotic oedema
C. Infectious mononucleosis
D. Acute maxillary sinusitis
E. Acute apical periodontitis
11. Internal resorption is
A. Radiolucency over unaltered canal
B. Usually in a response to trauma
C. Radiopacity over unaltered canal
12. On replantation of an avulsed tooth could see
A. Surface resorption, external resorption
B. Internal resorption
C. Inflammatory resorption
D. Replacement resorption
E. A, C and D
F. All of the above
13. The percentage of total dentine surface dentinal tubules make
in 0.5mm away from pulp is
A. 20%
B. 50%
14. The junction between primary and secondary dentine is
A. A reversal line
B. Sharp curvature
C. A resting line
D. A reduction in the number of tubules
, 3
15. What is the correct sequence of events
A. Differentiation of odontoblast, elongation of enamel epithelium,
dentine formation then enamel formation.
B. Differentiation of odontoblast, dentine formation then enamel
formation, elongation of enamel epithelium.
C. Elongation of enamel epithelium, differentiation of odontoblast,
dentine formation then enamel formation.
16. What is the sequence from superficial to the deepest in
dentine caries
A. Zone of bacterial penetration, demineralisation, sclerosis, reparative
dentine
B. Zone of bacterial penetration, reparative dentine, demineralisation,
sclerosis.
C. Zone of bacterial penetration, sclerosis, reparative dentine,
demineralisation.
17. The nerve supply of the pulp is composed of which type of
nerve fibres
A. Afferent & sympathetic
18. In which direction does the palatal root of the upper first
molar usually curve towards
A. Facial / buccal/
B. Lingual
C. Mesial
D. Distal
19. What is the common appearance of vertical tooth fracture
A. Perio abscess like appearance
B. Displacement of fragments
20. Which of the following would be ONE possible indication for
indirect pulp capping
A. Where any further excavation of dentine would result in pulp exposure.
B. Removal of caries has exposed the pulp
C. When carious lesion has just penetrated DEJ
21. Following trauma to tooth, the next day there was no
response to pulp tests you should
A. Review again later
