TEST BANK RATIONALE: PA EFDA BOARD
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EXAM (UPDATED 2026/2027) = = =
A+ GRADE =
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Section 1: Dental Anatomy and Tooth Morphology
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1. How many molars are present in the mandibular arch?
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• A. 4= =
• B. 6= =
• C. 8= =
• D. 10
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Answer: B = =
Rationale: The mandibular arch contains 6 molars: 3 on the right
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side and 3 on the left side (first, second, and third molars). The
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permanent dentition has a total of 12 molars across both arches
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(6 maxillary and 6 mandibular) . The molars are the most posterior
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teeth and are responsible for grinding food.
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Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
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,| Reference: Permanent Dentition
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2. The permanent mandibular second molar differs from the
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permanent mandibular first molar by number of:
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• A. Roots= =
• B. Cusps= =
• C. Grooves
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• D. Canals
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Answer: B = =
Rationale: The permanent mandibular first molar typically has 5
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cusps (mesiolingual, mesiofacial, distolingual, distofacial, distal),
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while the mandibular second molar typically has 4 cusps . This
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difference in cusp number is a key distinguishing feature between
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these two molars. Both teeth typically have 2 roots.
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Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
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| Reference: Molar Morphology
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3. Which structure is NOT found on the occlusal surface of a
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mandibular molar? = =
, • A. Cingulum
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• B. Marginal ridges
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• C. Grooves
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• D. Fossa
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Answer: A = =
Rationale: The cingulum is a rounded, raised area on the cervical
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third of the lingual surface of anterior teeth . It is NOT found on the
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occlusal surface of molars. Mandibular molars have marginal
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ridges, grooves, and fossae on their occlusal surfaces. The cingulum
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is a characteristic feature of incisors and canines only.
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Cognitive Level: Comprehension | Exam Domain: Dental
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Anatomy | Reference: Tooth Morphology
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4. A cusp of Carabelli is located on a maxillary first molar of
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the: =
• A. Mesiolingual cusp
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• B. Distolingual cusp
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• C. Mesiobuccal cusp
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, • D. Distobuccal cusp
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Answer: A = =
Rationale: The cusp of Carabelli is a supplemental cusp located on
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the mesiolingual cusp of the maxillary first molar . It is a trait of
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anthropological significance and is variable in expression. It is one
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of the identifying features of the maxillary first molar.
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Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
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| Reference: Maxillary First Molar
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5. The term "mamelons" refers to:
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• A. Rounded projections on the incisal edges of newly erupted
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incisors =
• B. Elevated crests of enamel
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• C. Pinpoint depressions where grooves meet
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• D. V-shaped spaces between teeth
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Answer: A = =
Rationale: Mamelons are the 3 round protuberances found on the
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incisal edges of newly erupted incisors . They wear down with norm
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= = = = = =
EXAM (UPDATED 2026/2027) = = =
A+ GRADE =
=
Section 1: Dental Anatomy and Tooth Morphology
= = = = = = =
1. How many molars are present in the mandibular arch?
= = = = = = = = =
• A. 4= =
• B. 6= =
• C. 8= =
• D. 10
= =
Answer: B = =
Rationale: The mandibular arch contains 6 molars: 3 on the right
= = = = = = = = = = =
side and 3 on the left side (first, second, and third molars). The
= = = = = = = = = = = = =
permanent dentition has a total of 12 molars across both arches
= = = = = = = = = = =
(6 maxillary and 6 mandibular) . The molars are the most posterior
= = = = = = = = = = =
teeth and are responsible for grinding food.
= = = = = = = =
Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
= = = = = = = =
,| Reference: Permanent Dentition
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=
2. The permanent mandibular second molar differs from the
= = = = = = = =
permanent mandibular first molar by number of:
= = = = = = =
• A. Roots= =
• B. Cusps= =
• C. Grooves
= =
• D. Canals
= =
Answer: B = =
Rationale: The permanent mandibular first molar typically has 5
= = = = = = = = =
cusps (mesiolingual, mesiofacial, distolingual, distofacial, distal),
= = = = =
while the mandibular second molar typically has 4 cusps . This
= = = = = = = = = = = =
difference in cusp number is a key distinguishing feature between
= = = = = = = = =
these two molars. Both teeth typically have 2 roots.
= = = = = = = = = =
Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
= = = = = = = =
| Reference: Molar Morphology
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=
3. Which structure is NOT found on the occlusal surface of a
= = = = = = = = = = =
mandibular molar? = =
, • A. Cingulum
= =
• B. Marginal ridges
= = =
• C. Grooves
= =
• D. Fossa
= =
Answer: A = =
Rationale: The cingulum is a rounded, raised area on the cervical
= = = = = = = = = =
third of the lingual surface of anterior teeth . It is NOT found on the
= = = = = = = = = = = = = = =
occlusal surface of molars. Mandibular molars have marginal
= = = = = = = = =
ridges, grooves, and fossae on their occlusal surfaces. The cingulum
= = = = = = = = = =
is a characteristic feature of incisors and canines only.
= = = = = = = = =
Cognitive Level: Comprehension | Exam Domain: Dental
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Anatomy | Reference: Tooth Morphology
= = = = =
=
4. A cusp of Carabelli is located on a maxillary first molar of
= = = = = = = = = = = =
the: =
• A. Mesiolingual cusp
= = =
• B. Distolingual cusp
= = =
• C. Mesiobuccal cusp
= = =
, • D. Distobuccal cusp
= = =
Answer: A = =
Rationale: The cusp of Carabelli is a supplemental cusp located on
= = = = = = = = = = =
the mesiolingual cusp of the maxillary first molar . It is a trait of
= = = = = = = = = = = = = =
anthropological significance and is variable in expression. It is one
= = = = = = = = = =
of the identifying features of the maxillary first molar.
= = = = = = = = =
Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
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| Reference: Maxillary First Molar
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5. The term "mamelons" refers to:
= = = = =
• A. Rounded projections on the incisal edges of newly erupted
= = = = = = = = = =
incisors =
• B. Elevated crests of enamel
= = = = =
• C. Pinpoint depressions where grooves meet
= = = = = =
• D. V-shaped spaces between teeth
= = = = =
Answer: A = =
Rationale: Mamelons are the 3 round protuberances found on the
= = = = = = = = =
incisal edges of newly erupted incisors . They wear down with norm
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