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

Which of the following statements is/are false about pulp polyp?

  1. Pulp polyp is a productive pulpal inflammation due to an extensive carious exposure of a young pulp.

  2. The surface of the pulp polyp is usually covered by stratified squamous epithelium.

  3. Both (1) and (2)

  4. The surface of the pulp polyp is usually covered by stratified columnar epithelium.

  5. Pulp polyp is generally seen only in the teeth of children and young adults.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is an incorrect statement about pulp polyp because the surface of the pulp polyp is usually covered by stratified squamous epithelium.

Multiple choice

In the mouth of rabbit, diastema is a gap between:

  1. premolar and molar

  2. canine and incisor

  3. canine and premolar

  4. incisor and premolar
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In rabbits, the diastema is the natural gap between the incisors and premolars. This space allows the manipulation of food during chewing and is characteristic of many herbivorous mammals. The other tooth pairs listed are adjacent without significant gaps.

Multiple choice

Which of the following bones constitute the lower jaw in mammal?

  1. Squamosal

  2. Dentary

  3. Quardrate

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

In mammals, the lower jaw consists of a single bone called the dentary. This is a key mammalian characteristic distinguishing them from other vertebrates, where the lower jaw comprises multiple bones (quadrate, articular, etc.).

Multiple choice

The teeth of shark are modified:

  1. ectoderm

  2. keratin substance

  3. placoid scales

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

Shark teeth are evolutionarily modified placoid scales, also called dermal denticles, which cover the shark's skin. These structures have the same basic composition as teeth - an enamel-like outer layer and a dentine core surrounding a pulp cavity. As teeth wear out or are lost, new ones rotate forward from reserve rows behind.

Multiple choice

Which of the following is not true regarding flourosis?

  1. Flourosis is the most common cause of dental caries in children.

  2. Deposition of flurides in the skeletal system and muscles.

  3. Deflouridation is done by Nalgonda technique.

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

Option A claims 'Fluorosis is the most common cause of dental caries in children' - this is the statement that is NOT true. Fluorosis causes enamel defects and mottling, NOT caries. Dental caries is caused by acid-producing bacteria (Streptococcus mutans) fermenting sugars. Options B, C, and D ARE true manifestations of fluorosis.

Multiple choice

Milk teeth in a child of 3-4 years do not include

  1. incisors

  2. canines

  3. molars

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

Deciduous dentition (milk teeth) in a young child typically consists of 20 teeth total: incisors, canines, and molars. Premolars are entirely absent in the primary dentition and only appear as permanent teeth.

Multiple choice

Pulp cavity of teeth is lined by

  1. odontoblast

  2. chondroblast

  3. osteoblast

  4. amyloblast

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

An odontoblast is a cell of neural crest origin i.e. part of the outer surface of the dental pulp, and whose biological function is dentinogenesis, which is the formation of dentin, the substance beneath the tooth enamel on the crown and the cementum on the root. 

Multiple choice

Which teeth are used for cutting?

  1. Molars

  2. Wisdom tooth

  3. Canines

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

These are chisel shaped with sharp cutting edges, used in cutting food.

Multiple choice

Which of the following types of traumatized teeth have a better rate of survival?

  1. Teeth with closed apices

  2. Teeth with open apices

  3. Primary teeth

  4. Apices of teeth are not related to their survival.

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

Open apex has more circulation and the tooth is still in developmental stage. There are viable cells as well in the connective tissue, which can differentiate accordingly. Thus, there is better prognosis.