Free Tooth Morphology MCQs with Answers

• A. Heterodont
• B. Haplodont
• C. Acrodont
• D. Thecodont

Explanation: Haplodont teeth have a simple conical crown with a single cusp and usually one root, as seen in the primitive dentition of some animals.

• A. Apex of the root
• B. Centre of the crown
• C. Tip of the cusp
• D. Centre of the tooth

Explanation: Each developmental lobe begins around a primary centre of formation located at the tip of its cusp or incisal elevation.

• A. Facial embrasure
• B. Lingual embrasure
• C. Occlusal embrasure
• D. Cervical embrasure

Explanation: The interdental papilla fills the cervical embrasure between adjacent teeth, extending coronally from the gingival margin.

• A. Both A and C
• B. Nearest the occlusal third of the lingual
• C. In the cervical third of the buccal
• D. In the middle third of the lingual

Explanation: Normal protective contours occur in the cervical third on buccal surfaces and around the middle third on lingual surfaces.

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

Explanation: Most posterior teeth are broader mesiodistally on the buccal than on the lingual side, but the maxillary first molar is the exception…

• A. Distribution of occlusal stresses
• B. Protection of periodontium
• C. Stabilization of dental arches
• D. All of the above

Explanation: Contact areas spread occlusal forces, shield the periodontium from food impaction and help neighbouring teeth maintain arch alignment.

• A. 5,6,7,8
• B. 4,5,6,7
• C. 3,4,5,6
• D. 2.3.4.5

Explanation: The mandibular second premolar through third molar, numbered 5 to 8, have contact areas that can be bisected by a relatively straight line…

• A. Lower than mesial contact area
• B. A and B
• C. Higher than mesial contact area
• D. Little cervical to junction of occlusal and middle third of crown

Explanation: On the maxillary first premolar, the distal contact is positioned more cervically than the mesial contact and lies slightly cervical to…

• A. Middle 3rd of proximal surface with lingual embrasure greater than the facial embrasure
• B. Occlusal 3rd of proximal surface with the lingual embrasure greater than facial embrasure
• C. Occlusal 3rd of proximal surface with facial embrasure greater than lingual embrasure
• D. Middle 3rd with facial embrasure greater than the lingual embrasure

Explanation: The distal contact of the maxillary first premolar lies in the middle third, and the lingual embrasure is larger than the facial embrasure…

• A. Maxillary lateral incisor
• B. Mandibular lateral incisor
• C. Maxillary central incisor
• D. Mandibular first premolar

Explanation: The maxillary lateral incisor is frequently anomalous in size, shape or position, so it commonly shows abnormal contact with adjacent…

• A. Maxillary central incisors
• B. Maxillary canine and first premolar
• C. Maxillary central and lateral incisor
• D. Maxillary lateral incisor and canine

Explanation: The occlusal embrasure generally becomes larger toward the posterior region, and the canine-first premolar interval forms the largest…

• A. Incisal and Occlusal
• B. Lingual and Occlusal
• C. Labial and lingual
• D. Labial and Occlusal

Explanation: The facial and lingual spaces around a contact are sometimes described as embrasures and sometimes as spillways or triangular spaces…

• A. None of the above
• B. Size of the teeth involved
• C. Eruption sequence involved
• D. Form of the teeth involved

Explanation: Embrasure spaces are shaped primarily by the form and contour of the adjacent teeth, especially their proximal surfaces and contact areas.

• A. 20°
• B. 28°
• C. 33°
• D. 38°

Explanation: The maxillary central incisor has a labiolingual or faciolingual crown angulation of about 28 degrees.

• A. Maxillary anterior
• B. Mandibular anteriors
• C. Mandibular canine
• D. Maxillary canine

Explanation: Mandibular anterior teeth have relatively flat facial and lingual crown surfaces with less curvature above the cervical line than other…

• A. Middle of the middle third with buccal embrasure wider than lingual
• B. Litter cervical to the junction of occlusal and middle third of the crown with wide occlusal embrasure
• C. Middle of the middle third with lingual embrasure wider than buccal
• D. Cervical third with buccal embrasure wider than lingual embrasure

Explanation: The distal contact of the maxillary first premolar lies slightly cervical to the junction of the occlusal and middle thirds.

• A. Lingually and gingivally
• B. Facially and gingivally
• C. Facially and occlusally
• D. Lingually and occlusally

Explanation: Posterior contact areas are generally positioned facially and occlusally relative to the center of the proximal surface.

• A. Lateral incisor and canine
• B. Central and lateral incisors
• C. Central incisors
• D. First and 2nd premolar

Explanation: Incisal embrasures generally become wider as they progress posteriorly from the central incisors, making the embrasure between the lateral…

• A. Facially
• B. Facially, lingually , cervically & occlusally
• C. Cervically
• D. Lingually

Explanation: A proximal contact area diverges in four directions, creating facial, lingual, occlusal or incisal, and cervical embrasures.

• A. Buccal
• B. Distal
• C. Lingual
• D. Occlusal

Explanation: In posterior teeth, the lingual embrasure is generally wider and more prominent than the buccal embrasure because posterior crowns…