NDEB Dental Anatomy and Occlusion 1 — Questions and Answers
Question 1: The mandibular first molar typically has how many cusps?
- 3
- 4
- 5 (Correct answer)
- 6
Correct answer: 5
The mandibular first molar has 5 cusps: mesiobuccal, distobuccal, mesiolingual, distolingual, and distal.
Question 2: Which permanent tooth typically has the longest root in the maxillary arch?
- Maxillary central incisor
- Maxillary first premolar
- Maxillary canine (Correct answer)
- Maxillary first molar
Correct answer: Maxillary canine
The maxillary canine has the longest root in the maxillary arch, averaging approximately 17 mm in length.
Question 3: The cusp of Carabelli is an accessory cusp most commonly found on which surface of the maxillary first molar?
- Distolingual cusp
- Mesiobuccal cusp
- Mesiolingual cusp (Correct answer)
- Distobuccal cusp
Correct answer: Mesiolingual cusp
The cusp of Carabelli appears on the mesiolingual (palatal) cusp of the maxillary first molar and is considered an accessory developmental feature.
Question 4: How many roots does the maxillary first molar typically have?
- 1
- 2
- 3 (Correct answer)
- 4
Correct answer: 3
The maxillary first molar has 3 roots: the mesiobuccal, distobuccal, and palatal (lingual) roots.
Question 5: The oblique ridge is a characteristic anatomical feature of which tooth?
- Maxillary first premolar
- Mandibular first molar
- Maxillary first molar (Correct answer)
- Maxillary second premolar
Correct answer: Maxillary first molar
The oblique ridge of the maxillary first molar connects the mesiolingual and distobuccal cusps diagonally across the occlusal surface.
Question 6: The mandibular second premolar most commonly has how many cusps?
- 1
- 2
- 3 (Correct answer)
- 4
Correct answer: 3
The 3-cusp (Y-type) form of the mandibular second premolar, with one buccal and two lingual cusps, is the most common configuration.
Question 7: The transverse ridge on the mandibular first premolar connects which two structural features?
- Mesiobuccal and distobuccal ridges
- Buccal and lingual cusps (Correct answer)
- Mesiolingual and distolingual ridges
- Buccal cusp and mesiolingual ridge
Correct answer: Buccal and lingual cusps
The transverse ridge of the mandibular first premolar is formed by the union of the buccal and lingual cusp ridges crossing the occlusal surface.
NDEB Dental Anatomy and Occlusion 1
The mandibular first molar typically has how many cusps?