MJDF Dental Anatomy & Physiology

Question 1

How many cusps does a mandibular first molar typically have?

Accepted Answer

Five (three buccal, two lingual)

Answer

The mandibular first molar classically has five cusps: mesiobuccal, distobuccal, distal (buccal), mesiolingual, and distolingual, making it the largest and most complex mandibular molar.

Question 2

Which tooth has the longest root in the permanent dentition?

Accepted Answer

Maxillary canine

Answer

The maxillary canine has the longest single root in the permanent dentition, which also accounts for its relatively late eruption and prominence in arch stability.

Question 3

What is the primary function of the periodontal ligament (PDL)?

Accepted Answer

Suspend the tooth in the alveolus, transmit occlusal forces, and provide sensory feedback

Answer

The PDL suspends the tooth with Sharpey's fibres, transmits and absorbs occlusal forces, provides proprioception, and supports tooth eruption and remodelling.

Question 4

Which structure forms the bulk of the tooth and determines its overall shape?

Accepted Answer

Dentine

Answer

Dentine constitutes the bulk of the tooth crown and root, forming its underlying shape; enamel covers the coronal dentine while cementum covers the root dentine.

Question 5

What type of epithelium lines the oral mucosa of the hard palate?

Accepted Answer

Keratinised stratified squamous epithelium

Answer

The hard palate is covered by keratinised stratified squamous epithelium, providing durability against masticatory forces and friction from food.

MJDF Part 1 Practice Test

MJDF Part 1 Practice Test

MJDF Dental Anatomy & Physiology