All Free Oral Anatomy MCQs with Answers

• A. Distobuccal
• B. Distolingual
• C. Mesiobuccal
• D. Mesiolingual

Explanation: In the primary mandibular first molar, the mesiolingual cusp is the highest, longest and sharpest cusp.

• A. Maxillary second molarBook Dental Checkups
• B. Maxillary first molar
• C. Mandibular second molar
• D. Mandibular first molar

Explanation: The primary mandibular first molar is notable for a prominent transverse ridge formed by the union of triangular ridges from opposing…

• A. All of the above
• B. Pulp chambers are longer
• C. Roots are flaring
• D. Thickness of enamel and dentin

Explanation: Primary teeth have thinner enamel and dentin, proportionately larger pulp chambers, and widely flared roots to accommodate the developing…

• A. Permanent second molar
• B. Second premolar
• C. Permanent first molar
• D. Primary first molar

Explanation: The primary mandibular second molar closely resembles the permanent mandibular first molar in its occlusal outline and five-cusp pattern.

• A. One
• B. Two
• C. Four
• D. Three

Explanation: A primary maxillary first molar normally has three roots: mesiobuccal, distobuccal, and palatal.

• A. 2
• B. 3
• C. 4
• D. 5

Explanation: The primary maxillary first molar generally has four cusps, although the distolingual cusp may be relatively small.

• A. Mandibular 1st molar
• B. Mandibular2nd molar
• C. Maxillary 2nd molar
• D. None of the above

Explanation: The primary mandibular second molar is usually the largest tooth in the primary dentition, particularly in mesiodistal width.

• A. Buliker anteroposteriorly
• B. Slender anteroposteriorly
• C. Bulkier mesiodistally
• D. Slender mesiodistally

Explanation: Primary molars show marked cervical constriction, so their cervical portions are relatively slender mesiodistally compared with the…

• A. Four pulp horn and three root canal
• B. Three pulp horn and three root canal
• C. Two pulp horn and two root canal
• D. Two pulp horn and three root canal

Explanation: The pulp of a primary maxillary first molar commonly has four pulp horns but three root canals, corresponding broadly to its three roots.

• A. 50μm
• B. 25 μm
• C. 75μm
• D. 100μm

Explanation: The prismless outer enamel layer of primary teeth is approximately 25 micrometres thick.

• A. Same as permanent teeth
• B. Inclined in an apical direction in the cervical third of crown
• C. Inclined in an occlusal direction in the cervical third of crown
• D. None of the above

Explanation: In primary teeth, enamel rods in the cervical third incline occlusally toward the gingival margin, unlike the usual apical inclination…

• A. Greater
• B. Less
• C. The same
• D. Not related

Explanation: The combined mesiodistal width of the primary first and second molars is generally greater than that of their permanent premolar…

• A. Decidous mandibular 1st molar
• B. Decidous maxillary 2nd molar
• C. Decidous maxillary 1st molar
• D. Decidous mandibular 2nd molar

Explanation: A cusp of Carabelli may occur as a normal accessory cusp on the primary maxillary second molar, as it commonly does on the permanent…

• A. 3
• B. 6
• C. 4
• D. 5

Explanation: The mandibular second primary molar usually has five cusps, and its pulp chamber commonly reflects this pattern with five pulp horns.

• A. Central incisors
• B. Canines
• C. Mandibular second molar
• D. Mandibular first molar

Explanation: The primary mandibular first molar differs most strikingly from its permanent successor in crown form, with a unique morphology that…

• A. Decidous maxillary 1st molar
• B. Decidous maxillary 2nd molar
• C. Decidous mandibular 2nd molar
• D. Decidous mandibular 1st molar

Explanation: Among the listed primary molars, the maxillary second molar generally has the greatest faciolingual crown width.

• A. Mandibular first
• B. Maxillary second
• C. Maxillary first
• D. Mandibular second

Explanation: The primary maxillary first molar most closely resembles a premolar in its crown form.

• A. First molar
• B. Central incisors
• C. Canines
• D. Premolars

Explanation: Canines have long, strongly anchored roots and robust crowns, making them particularly resistant to periodontal breakdown and commonly the…

• A. Herbivorous
• B. None of the aboveBook Dental Checkups
• C. Carnivorous
• D. Omnivorous

Explanation: Humans are omnivores because the dentition contains incisors and canines for cutting and tearing, together with premolars and molars…

• A. Upper central incisors
• B. Lower central incisors
• C. Upper canines
• D. Lower canines

Explanation: The labial plate over the mandibular central incisors is particularly thin because the roots lie close to the labial cortical plate.