CDT Dental Anatomy & Morphology 2 — Questions and Answers
Question 1: Which cusp of the maxillary first molar is known as the 'cusp of Carabelli' and is considered a non-functional accessory cusp?
- Mesiolingual cusp (Correct answer)
- Distolingual cusp
- Mesiobuccal cusp
- Distobuccal cusp
Correct answer: Mesiolingual cusp
The cusp of Carabelli is a fifth accessory cusp located on the lingual surface of the mesiolingual cusp of the maxillary first molar.
Question 2: How many roots does a mandibular first molar typically have?
- One root
- Two roots (Correct answer)
- Three roots
- Four roots
Correct answer: Two roots
The mandibular first molar normally has two roots — one mesial and one distal.
Question 3: The oblique ridge is a landmark unique to which tooth?
- Maxillary first premolar
- Maxillary first molar (Correct answer)
- Mandibular second molar
- Mandibular first premolar
Correct answer: Maxillary first molar
The oblique ridge of the maxillary first molar runs diagonally across the occlusal surface from the distobuccal cusp to the mesiolingual cusp.
Question 4: Which permanent tooth has the longest root in the entire dentition?
- Maxillary central incisor
- Maxillary canine (Correct answer)
- Mandibular canine
- Maxillary first premolar
Correct answer: Maxillary canine
The maxillary canine has the longest root of any tooth in the permanent dentition.
Question 5: What is the name of the ridge that runs cervico-occlusally on the buccal surface of posterior teeth?
- Marginal ridge
- Buccal ridge (Correct answer)
- Transverse ridge
- Triangular ridge
Correct answer: Buccal ridge
The buccal ridge is a vertical elevation running cervico-occlusally along the middle of the buccal surface of premolars and molars.
Question 6: In the primary dentition, which tooth most closely resembles the permanent maxillary first molar in occlusal morphology?
- Maxillary primary first molar
- Maxillary primary second molar (Correct answer)
- Maxillary primary canine
- Mandibular primary second molar
Correct answer: Maxillary primary second molar
The maxillary primary second molar closely resembles the permanent maxillary first molar, including an oblique ridge and cusp of Carabelli.
Question 7: Which of the following describes the location of the cingulum on an anterior tooth?
- Incisal edge on the labial surface
- Cervical third of the lingual surface (Correct answer)
- Middle third of the buccal surface
- Proximal contact area
Correct answer: Cervical third of the lingual surface
The cingulum is a convex eminence located on the cervical third of the lingual surface of anterior teeth.
CDT Dental Anatomy & Morphology 2
Which cusp of the maxillary first molar is known as the 'cusp of Carabelli' and is considered a non-functional accessory cusp?