MJDF Dental Anatomy & Physiology 2

Question 1

Which salivary gland produces the most saliva in resting (unstimulated) conditions?

Accepted Answer

Submandibular gland

Answer

The submandibular glands contribute approximately 65–70% of unstimulated saliva; the parotid gland dominates stimulated salivary flow, producing a serous secretion.

Question 2

What is the role of saliva in caries prevention?

Accepted Answer

Buffering acids, antimicrobial proteins, remineralisation, lubrication, and pellicle formation

Answer

Saliva prevents caries through bicarbonate buffering of plaque acids, antimicrobial proteins (lactoferrin, lysozyme, IgA), calcium and phosphate for remineralisation, and forming the protective acquired pellicle.

Question 3

Where does Wharton's duct open in the mouth?

Accepted Answer

Sublingual papilla at the base of the frenulum (lingual to lower central incisors)

Answer

Wharton's duct (submandibular duct) opens at the sublingual papilla (caruncle) adjacent to the lingual frenum on the floor of the mouth.

Question 4

What is the embryological origin of enamel?

Accepted Answer

Oral ectoderm (dental lamina and enamel organ)

Answer

Enamel is the only dental tissue derived from oral ectoderm; ameloblasts originate from the inner enamel epithelium of the enamel organ, which develops from the dental lamina.

Question 5

Which nerve supplies sensory innervation to the mandibular first molar?

Accepted Answer

Inferior alveolar nerve (branch of V3)

Answer

The inferior alveolar nerve (a branch of V3, mandibular division of trigeminal) provides sensory innervation to all mandibular posterior teeth via the mandibular canal.

MJDF Part 1 Practice Test

MJDF Part 1 Practice Test

MJDF Dental Anatomy & Physiology 2