CDT Dental Anatomy & Morphology 3 — Questions and Answers
Question 1: The mandibular second premolar most commonly has which occlusal pattern?
- Two-cusp (buccal and lingual) pattern only
- Three-cusp (Y-type) pattern more frequently than two-cusp (Correct answer)
- Four-cusp pattern similar to a molar
- Single-cusp pattern with no groove
Correct answer: Three-cusp (Y-type) pattern more frequently than two-cusp
The mandibular second premolar more frequently displays a three-cusp Y-type pattern with one buccal and two lingual cusps than the simpler two-cusp arrangement.
Question 2: Which groove separates the mesiolingual and distolingual cusps on the occlusal surface of the mandibular first molar?
- Buccal groove
- Lingual groove (Correct answer)
- Central groove
- Distal groove
Correct answer: Lingual groove
The lingual groove runs lingually between the mesiolingual and distolingual cusps of the mandibular first molar.
Question 3: What is the defining morphological feature that distinguishes the maxillary lateral incisor from the maxillary central incisor?
- It is larger in all dimensions
- It is smaller and more variable in shape with a more rounded incisal edge (Correct answer)
- It has no cingulum
- It has two roots
Correct answer: It is smaller and more variable in shape with a more rounded incisal edge
The maxillary lateral incisor is smaller and more variable in form than the central incisor, with a more rounded incisal edge and narrower mesiodistal width.
Question 4: The 'cusp of Zuckerkandl' refers to a developmental anomaly sometimes seen on which tooth?
- Maxillary first molar
- Mandibular first premolar
- Mandibular first molar (Correct answer)
- Maxillary canine
Correct answer: Mandibular first molar
The cusp of Zuckerkandl (also called the distal cusp or tuberculum paramolare) is an accessory cusp sometimes found on the distobuccal aspect of the mandibular first molar.
Question 5: How many pulp horns are typically present in a maxillary first molar?
- Two
- Three
- Four (Correct answer)
- Five
Correct answer: Four
The maxillary first molar typically has four pulp horns, each corresponding to its four main cusps (mesiobuccal, distobuccal, mesiolingual, distolingual).
Question 6: Which surface of the mandibular canine is broader — the mesial or the distal?
- Both surfaces are equal in width
- The mesial surface is broader (Correct answer)
- The distal surface is broader
- It varies with no consistent pattern
Correct answer: The mesial surface is broader
The mesial surface of the mandibular canine is broader than the distal surface, and its contact area is more incisal.
Question 7: Neonatal lines in primary tooth enamel mark which developmental event?
- The beginning of root formation
- The physiological stress at birth (Correct answer)
- The eruption of the tooth into the oral cavity
- The completion of crown calcification
Correct answer: The physiological stress at birth
Neonatal lines are accentuated incremental lines in enamel and dentin that represent the metabolic disturbance experienced at the time of birth.
CDT Dental Anatomy & Morphology 3
The mandibular second premolar most commonly has which occlusal pattern?