NDEB Exam 2026–2027 | Complete Solved
Questions, Correct Answers and Detailed Rationales
| Updated Canadian Dentistry Board Exam Study
Guide | Verified Practice Questions for NDEB
Success
THIS EXAM INCLUDES;
• ✅ 300+ NDEB practice questions
• ✅ Verified correct answers with detailed rationales
• ✅ Written Exam preparation materials
• ✅ Assessment of Fundamental Knowledge (AFK) review questions
• ✅ OSCE-style case scenarios and explanations
• ✅ Case-based clinical reasoning questions
• ✅ High-yield facts and exam tips
• ✅ Detailed explanations to reinforce concepts
• ✅ Latest 2026–2027 updates
,NDEB Exam
QUESTION 1
The principal reason for a cavosurface bevel on an inlay preparation is
to:
A. remove undermined enamel.
B. improve marginal adaptation.
C. decrease marginal percolation.
D. increase resistance and retention forms.
Correct Answer: B. improve marginal adaptation.
Rationale: A cavosurface bevel exposes enamel rods at an angle, allowing
the gold inlay or casting to adapt more closely to the tooth margin. This
creates a smooth, feather-edged junction that reduces marginal gaps and
improves fit. While it may indirectly help with marginal leakage, the primary
purpose is adaptation (mechanical fit).
QUESTION 2
Lichen planus occurs most frequently on the:
A. buccal mucosa.
B. tongue.
C. floor of the mouth.
D. gingiva.
Correct Answer: A. buccal mucosa.
Rationale: Oral lichen planus has a strong predilection for the buccal
,mucosa (bilaterally), followed by the tongue and gingiva. The reticular
(white striae) form is most common on the buccal mucosa. The floor of the
mouth is a less common site.
QUESTION 3
The pulpal floor of a Class II cavity is cut perpendicular to the long axis
of the tooth EXCEPT in the:
A. maxillary first premolar.
B. maxillary second premolar.
C. mandibular second premolar.
D. mandibular first premolar.
Correct Answer: D. mandibular first premolar.
Rationale: The mandibular first premolar has a distinctive lingual
inclination of its pulp chamber and roots. Cutting the pulpal floor
perpendicular to the long axis would risk pulpal exposure; therefore, it is
angled to follow the pulp chamber's orientation.
QUESTION 4
Upon examination of an edentulous patient, it is observed that the
tuberosities contact the retromolar pads at the correct occlusal vertical
dimension. The treatment of choice is to:
A. reduce the retromolar pads surgically.
B. reduce the tuberosities surgically.
, C. construct new dentures at an increased OVD.
D. proceed with denture construction and reduce the posterior extension of
the mandibular denture.
Correct Answer: B. reduce the tuberosities surgically.
Rationale: When tuberosities contact retromolar pads at the correct
vertical dimension, there is insufficient space for the denture base.
Surgically reducing the tuberosities (alveoloplasty) provides the necessary
clearance without altering OVD, which must remain correct.
QUESTION 5
In the absence of "Hanks balanced salt solution", what is the most
appropriate media to transport an avulsed tooth?
A. Saliva.
B. Milk.
C. Saline.
D. Tap water.
Correct Answer: B. Milk.
Rationale: Milk is the best readily available transport medium because it
has a physiological osmolality, provides nutrients (amino acids, glucose),
and maintains viable periodontal ligament cells. Saliva is hypotonic and
contains bacteria; tap water causes rapid cell lysis; saline is not ideal for
long-term cell viability.
Questions, Correct Answers and Detailed Rationales
| Updated Canadian Dentistry Board Exam Study
Guide | Verified Practice Questions for NDEB
Success
THIS EXAM INCLUDES;
• ✅ 300+ NDEB practice questions
• ✅ Verified correct answers with detailed rationales
• ✅ Written Exam preparation materials
• ✅ Assessment of Fundamental Knowledge (AFK) review questions
• ✅ OSCE-style case scenarios and explanations
• ✅ Case-based clinical reasoning questions
• ✅ High-yield facts and exam tips
• ✅ Detailed explanations to reinforce concepts
• ✅ Latest 2026–2027 updates
,NDEB Exam
QUESTION 1
The principal reason for a cavosurface bevel on an inlay preparation is
to:
A. remove undermined enamel.
B. improve marginal adaptation.
C. decrease marginal percolation.
D. increase resistance and retention forms.
Correct Answer: B. improve marginal adaptation.
Rationale: A cavosurface bevel exposes enamel rods at an angle, allowing
the gold inlay or casting to adapt more closely to the tooth margin. This
creates a smooth, feather-edged junction that reduces marginal gaps and
improves fit. While it may indirectly help with marginal leakage, the primary
purpose is adaptation (mechanical fit).
QUESTION 2
Lichen planus occurs most frequently on the:
A. buccal mucosa.
B. tongue.
C. floor of the mouth.
D. gingiva.
Correct Answer: A. buccal mucosa.
Rationale: Oral lichen planus has a strong predilection for the buccal
,mucosa (bilaterally), followed by the tongue and gingiva. The reticular
(white striae) form is most common on the buccal mucosa. The floor of the
mouth is a less common site.
QUESTION 3
The pulpal floor of a Class II cavity is cut perpendicular to the long axis
of the tooth EXCEPT in the:
A. maxillary first premolar.
B. maxillary second premolar.
C. mandibular second premolar.
D. mandibular first premolar.
Correct Answer: D. mandibular first premolar.
Rationale: The mandibular first premolar has a distinctive lingual
inclination of its pulp chamber and roots. Cutting the pulpal floor
perpendicular to the long axis would risk pulpal exposure; therefore, it is
angled to follow the pulp chamber's orientation.
QUESTION 4
Upon examination of an edentulous patient, it is observed that the
tuberosities contact the retromolar pads at the correct occlusal vertical
dimension. The treatment of choice is to:
A. reduce the retromolar pads surgically.
B. reduce the tuberosities surgically.
, C. construct new dentures at an increased OVD.
D. proceed with denture construction and reduce the posterior extension of
the mandibular denture.
Correct Answer: B. reduce the tuberosities surgically.
Rationale: When tuberosities contact retromolar pads at the correct
vertical dimension, there is insufficient space for the denture base.
Surgically reducing the tuberosities (alveoloplasty) provides the necessary
clearance without altering OVD, which must remain correct.
QUESTION 5
In the absence of "Hanks balanced salt solution", what is the most
appropriate media to transport an avulsed tooth?
A. Saliva.
B. Milk.
C. Saline.
D. Tap water.
Correct Answer: B. Milk.
Rationale: Milk is the best readily available transport medium because it
has a physiological osmolality, provides nutrients (amino acids, glucose),
and maintains viable periodontal ligament cells. Saliva is hypotonic and
contains bacteria; tap water causes rapid cell lysis; saline is not ideal for
long-term cell viability.
