CDT Dental Anatomy & Morphology Understanding 2 — Questions and Answers
Question 1: Which cusp of the maxillary first molar is the smallest and located on the distolingual aspect?
- Cusp of Carabelli
- Distobuccal cusp
- Distolingual cusp
- Cusp of 5th (Correct answer)
Correct answer: Cusp of 5th
The fifth cusp of the maxillary first molar, sometimes called the cusp of 5 or tubercle of Carabelli's counterpart, is located on the distolingual surface and is the smallest cusp.
Question 2: The triangular ridge of a cusp runs in which direction?
- Mesiodistally along the marginal ridge
- From the cusp tip toward the central groove (Correct answer)
- Buccolingually along the occlusal surface perimeter
- From one marginal ridge to the opposite marginal ridge
Correct answer: From the cusp tip toward the central groove
A triangular ridge descends from the tip of a cusp toward the central developmental groove of the tooth.
Question 3: Which permanent tooth has a prominent lingual ridge dividing its lingual surface into two fossae?
- Maxillary lateral incisor
- Mandibular canine
- Maxillary canine (Correct answer)
- Mandibular central incisor
Correct answer: Maxillary canine
The maxillary canine has a prominent lingual ridge that divides the lingual surface into mesiolingual and distolingual fossae.
Question 4: The contact area of anterior teeth is located closest to which region?
- Middle third of the crown
- Cervical third of the crown
- Incisal third of the crown (Correct answer)
- Junction of incisal and middle thirds
Correct answer: Incisal third of the crown
Contact areas of anterior teeth are located in the incisal third of the crown, near the incisal edge.
Question 5: Which mandibular premolar most closely resembles a canine in its occlusal morphology?
- Mandibular first premolar (Correct answer)
- Mandibular second premolar (3-cusp type)
- Mandibular second premolar (2-cusp type)
- Both premolars equally
Correct answer: Mandibular first premolar
The mandibular first premolar has a dominant buccal cusp and a small, nonfunctional lingual cusp, giving it a canine-like appearance from the occlusal view.
Question 6: What is the term for the curved line representing the greatest mesiodistal width of a tooth as viewed from the facial aspect?
- Height of contour
- Contact area
- Facial axis
- Crest of curvature (Correct answer)
Correct answer: Crest of curvature
The crest of curvature (height of contour) is the most prominent point of the crown in each direction, representing its widest extent.
Question 7: The Cusp of Carabelli is most consistently found on which tooth?
- Maxillary second molar
- Maxillary first molar (Correct answer)
- Mandibular first molar
- Maxillary first premolar
Correct answer: Maxillary first molar
The Cusp of Carabelli is an accessory cusp found on the mesiolingual surface of the maxillary first molar, though it varies in expression.
CDT Dental Anatomy & Morphology Understanding 2
Which cusp of the maxillary first molar is the smallest and located on the distolingual aspect?