Biology

Dental and Oral Biology

967 Questions

Dental and Oral Biology focuses on the structure, development, and function of teeth and oral tissues. It covers key concepts like dental formulas, tooth eruption, and common oral diseases. These topics are essential for medical and biology entrance examinations.

Dental formulaTooth anatomyMilk teethOral diseasesTooth decay

Dental and Oral Biology Questions

Multiple choice

Pure hinge movements of the mandible occur at

  1. terminal hinge position

  2. centric relation

  3. centric occlusion

  4. all of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hinge axis is an imaginary line passing through the centre of condyles around which the mandible rotates in sagittal plane and this position is also called 'Terminal hinge position'.

Multiple choice

Which of the following statements is/are correct?

a. Dentine is the hardest material in our body. b. Inside the dentine is the pulp cavity that contains nerve cells and blood vessels. c. The formation of cavities in teeth due to acid-forming bacteria is called plaque.

  1. a only

  2. b only

  3. c only

  4. a and b

  5. a and c
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct answer as inside the dentine is the pulp cavity that contains nerve cells and blood vessels.

Multiple choice

Dental formula for frog is

  1. 3/3, 1/1, 4/4, 2/3

  2. 2/2, 1/1, 2/2, 2/2, 3/3

  3. 2/1, 0/0, 3/2, 3/3

  4. Not reconstructible as frogs are homodont (all teeth are similar) and polyphyodont (teeth arise many times in their life history).
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Only mammals possess dental formula as they have heterodont (different set up of teeth) type set up.

Multiple choice

Palatine aponeurosis is

  1. tendon of levator veli palatine muscle

  2. tendon of tensor veli palatine muscle

  3. a part of muscle uvulae

  4. a modification of palatal periosteum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A thin, fibrous palatine aponeurois supports the muscles and strengthens the soft palate. It is attached to the posterior and the inferior surface of the hard palate behind the palatine crest.

Multiple choice

Which of the following nerves supplies capsule of temporomandibular joint?

  1. Facial nerve

  2. Maxillary nerve

  3. Auriculotemporal nerve

  4. Mandibular nerve
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Branches of the auriculotemporal and masseteric nerves and postganglionic sympathetic nerves supply the tissues associated with the capsular ligament and the looser posterior bilaminar extension of the disc.

Multiple choice

What is the condition related to taurodontism?

  1. Abnormal dentin

  2. Furcation near apex

  3. Large pulp chamber

  4. Rectangular crown
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Taurodontism is also termed as 'bull-like tooth'. Most commonly affected teeth are usually molars. The condition is best identified on radiographs. Pulp chambers are large.

Multiple choice

Lead poisoning is seen on gingiva as _______________.

  1. yellowish line

  2. bluish black line

  3. greenish line

  4. brownish line
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This black line is termed as halo saturninus or Burtonian  line. This is similar to bismuth line, but the difference is that the lead line is more diffuse.

Multiple choice

What is the shape of the dentinal caries?

  1. It is always V-shaped with base towards DEJ.

  2. It is always V-shaped with base towards pulp.

  3. It is dependant on type of lesion.

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dentinal carries grossly tend to assume the shape of a triangle with the apex towards the pulp and the base toward the enamel.

Multiple choice

The buffering capacity of saliva is against which kind of bacteria?

  1. Acidogenic

  2. Polymorphic

  3. Intercellular

  4. Anaerobic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Buffer capacity of saliva implies its acid-neutralizing power. Acidogenic organisms produce acids in the oral cavity, which leads to demineralization of tooth structure. These acids are neutralized with the help of buffers like bicarbonates and phosphates.