DH 190 Orofacial Structures, Histology and Embryology Review Exam Q & A 2026 (Complete And Verified Study material) (18pages) LEARNEXAMS

1. **Nomenclature**: Which term correctly identifies the depression

located between the lower lip and the chin?

 A) Labiomental groove

 B) Philtrum

 C) Buccal vestibule

 D) Oral fissure

 **Answer**: A) Labiomental groove

 **Rationale**: The labiomental groove is the anatomical term for the

horizontal groove between the lower lip and the chin, distinguishing it

from other facial features.

2. **Morphology**: What is the predominant shape of the maxillary

central incisor?

 A) Conical

 B) Triangular

 C) Rectangular

 D) Rhomboidal

 **Answer**: B) Triangular

 **Rationale**: The crown of the maxillary central incisor is

predominantly triangular when viewed from the incisal aspect, reflecting

its role in esthetics and phonetics.

3. **Anatomy**: Which muscle is primarily responsible for elevating the

mandible?

 A) Temporalis

 B) Masseter

 C) Medial pterygoid

 D) Lateral pterygoid

 **Answer**: B) Masseter

 **Rationale**: The masseter muscle, along with the temporalis, plays a

key role in jaw elevation during mastication.

4. **Physiology**: During mastication, which phase involves the

voluntary positioning of food between the teeth?

 A) Oral preparatory phase

 B) Oral phase

 C) Pharyngeal phase

 D) Esophageal phase