Biology

Dental and Oral Biology

924 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

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

Mandibular tori are commonly found to be present in which of the following?

  1. Molars

  2. Premolars

  3. Incis<font size="2">ors</font>

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

Torus mandibularis is an exostosis or outgrowth of bone found on the lingual surface of mandible. It is seen above the mylohyoid line and opposite the bicuspid teeth. It is usually bilateral, and surgical removal of torus is advised sometimes due to the difficulty encountered in construction of a denture.

Multiple choice

Dens in dente is most commonly seen in ____________.

  1. premolars

  2. lateral incisors

  3. paramolars

  4. maxillary canines
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Dens in dente is also called dens invaginatus or dilated composite odontome . This condition arises due to invagination of inner enamel epithelium in the surface of tooth, before the calcification has occurred. This term was coined due to the appearance of a tooth within a tooth.

Multiple choice

What is the white patch on the buccal mucosa which disappears on stretching?

  1. Leukoplakia

  2. White sponge nevus

  3. Scleroderma

  4. Lekoedema
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Leukoedema, clinically, can be seen as a white filmy opalaescent hue to definite grayish white area. It disappears on stretching and this is a characteristic feature of leukoedema. No treatment is required. It is a normal variation of oral mucosa.

Multiple choice

Which of the following is true about xerostomia?

  1. Ph of saliva increases

  2. Ph of saliva decreases

  3. Ph of saliva increases in morning and decreases in evening

  4. Ph of saliva remains unchanged
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Xerostomia is not a disease by itself, but the result of certain other disease. Only the quantity of saliva secreted is decreased in xerotomia, but the quality remains unchanged.