TEST BANK RATIONALE: PA EFDA BOARD
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EXAM | ACTUAL 180 QS & AS | LATEST --- --- --- --- --- --- --- --- ---
UPDATE 2026/2027| GRADED A+ --- --- --- ---
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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--- ---
Answer: B --- ---
Rationale: There are 6 molars present in the mandibular arch .
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This includes the first molars, second molars, and third molars on
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both the right and left sides. The mandibular arch has 3 molars
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per quadrant (first, second, third) × 2 quadrants = 6 total
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molars. Understanding tooth count is fundamental for dental
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charting and restorative procedures. In contrast, the maxillary
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,arch also has 6 molars, making a total of 12 permanent molars in
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-- the complete dentition.
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Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
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| Reference: PA EFDA Board Exam Content Outline
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2. The permanent mandibular second molar differs from the
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permanent mandibular first molar by number of: --- --- --- --- --- --- ---
• A. Roots --- ---
• B. Cusps
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• C. Canals --- ---
• D. Marginal ridges
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Answer: B --- ---
Rationale: The permanent mandibular second molar differs from
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the permanent mandibular first molar by number of cusps . The
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mandibular first molar typically has 5 cusps (mesiolingual,
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mesiofacial, distolingual, distofacial, and distal), while the
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mandibular second molar typically has 4 cusps . This --- --- --- --- --- --- --- --- ---
morphological difference is important for cavity preparation --- --- --- --- --- --- ---
,design and restoration placement. The first molar is also
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generally larger than the second molar.
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Cognitive Level: Comprehension | Exam Domain: Dental
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Anatomy | Reference: PA EFDA Board Exam Content Outline
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3. Which is NOT found on the occlusal surface of a
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mandibular molar? --- ---
• A. Central groove--- --- ---
• B. Marginal ridges
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• C. Cingulum --- ---
• D. Triangular fossae
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Answer: C --- ---
Rationale: A cingulum is NOT found on the occlusal surface of a
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mandibular molar . The cingulum is a rounded, raised area on the
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-- cervical third of the lingual surface of anterior teeth, particularly
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incisors and canines. The occlusal surface of molars contains
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grooves, fossae, pits, marginal ridges, and cusps—not cingula.
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This distinction is important for correct tooth identification and
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charting. ---
, Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
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| Reference: PA EFDA Board Exam Content Outline
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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: A cusp of Carabelli is located on the mesiolingual
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cusp of the maxillary first molar . This is an accessory cusp found
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on the lingual surface of the mesiolingual cusp. It is a common
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anatomical variation that may be present in some individuals and
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-- absent in others. The cusp of Carabelli is a clinically significant
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landmark for dental restorations, especially class I and class II
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preparations on maxillary first molars. --- --- --- --- ---
Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
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| Reference: PA EFDA Board Exam Content Outline
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--- --- --- --- --- ---
EXAM | ACTUAL 180 QS & AS | LATEST --- --- --- --- --- --- --- --- ---
UPDATE 2026/2027| GRADED A+ --- --- --- ---
---
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: There are 6 molars present in the mandibular arch .
--- --- --- --- --- --- --- --- --- --- ---
This includes the first molars, second molars, and third molars on
--- --- --- --- --- --- --- --- --- --- ---
both the right and left sides. The mandibular arch has 3 molars
--- --- --- --- --- --- --- --- --- --- --- ---
per quadrant (first, second, third) × 2 quadrants = 6 total
--- --- --- --- --- --- --- --- --- --- ---
molars. Understanding tooth count is fundamental for dental
--- --- --- --- --- --- --- ---
charting and restorative procedures. In contrast, the maxillary
--- --- --- --- --- --- --- ---
,arch also has 6 molars, making a total of 12 permanent molars in
--- --- --- --- --- --- --- --- --- --- --- --- -
-- the complete dentition.
--- --- ---
Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
--- --- --- --- --- --- --- ---
| Reference: PA EFDA Board Exam Content Outline
--- --- --- --- --- --- --- ---
--
-
2. The permanent mandibular second molar differs from the
--- --- --- --- --- --- --- --- ---
permanent mandibular first molar by number of: --- --- --- --- --- --- ---
• A. Roots --- ---
• B. Cusps
--- ---
• C. Canals --- ---
• D. Marginal ridges
--- --- ---
Answer: B --- ---
Rationale: The permanent mandibular second molar differs from
--- --- --- --- --- --- --- ---
the permanent mandibular first molar by number of cusps . The
--- --- --- --- --- --- --- --- --- --- ---
mandibular first molar typically has 5 cusps (mesiolingual,
--- --- --- --- --- --- --- ---
mesiofacial, distolingual, distofacial, and distal), while the
--- --- --- --- --- --- ---
mandibular second molar typically has 4 cusps . This --- --- --- --- --- --- --- --- ---
morphological difference is important for cavity preparation --- --- --- --- --- --- ---
,design and restoration placement. The first molar is also
--- --- --- --- --- --- --- --- ---
generally larger than the second molar.
--- --- --- --- --- ---
Cognitive Level: Comprehension | Exam Domain: Dental
--- --- --- --- --- --- ---
Anatomy | Reference: PA EFDA Board Exam Content Outline
--- --- --- --- --- --- --- --- ---
--
-
3. Which is NOT found on the occlusal surface of a
--- --- --- --- --- --- --- --- --- ---
mandibular molar? --- ---
• A. Central groove--- --- ---
• B. Marginal ridges
--- --- ---
• C. Cingulum --- ---
• D. Triangular fossae
--- --- ---
Answer: C --- ---
Rationale: A cingulum is NOT found on the occlusal surface of a
--- --- --- --- --- --- --- --- --- --- --- ---
mandibular molar . The cingulum is a rounded, raised area on the
--- --- --- --- --- --- --- --- --- --- --- -
-- cervical third of the lingual surface of anterior teeth, particularly
--- --- --- --- --- --- --- --- --- ---
incisors and canines. The occlusal surface of molars contains
--- --- --- --- --- --- --- --- ---
grooves, fossae, pits, marginal ridges, and cusps—not cingula.
--- --- --- --- --- --- --- ---
This distinction is important for correct tooth identification and
--- --- --- --- --- --- --- --- ---
charting. ---
, Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
--- --- --- --- --- --- --- ---
| Reference: PA EFDA Board Exam Content Outline
--- --- --- --- --- --- --- ---
--
-
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: A cusp of Carabelli is located on the mesiolingual
--- --- --- --- --- --- --- --- --- ---
cusp of the maxillary first molar . This is an accessory cusp found
--- --- --- --- --- --- --- --- --- --- --- --- ---
on the lingual surface of the mesiolingual cusp. It is a common
--- --- --- --- --- --- --- --- --- --- --- ---
anatomical variation that may be present in some individuals and
--- --- --- --- --- --- --- --- --- -
-- absent in others. The cusp of Carabelli is a clinically significant
--- --- --- --- --- --- --- --- --- --- ---
landmark for dental restorations, especially class I and class II
--- --- --- --- --- --- --- --- --- ---
preparations on maxillary first molars. --- --- --- --- ---
Cognitive Level: Knowledge | Exam Domain: Dental Anatomy
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| Reference: PA EFDA Board Exam Content Outline
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