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

The layer of cells that secretes enamel of tooth is

  1. dentoblast

  2. osteoblast

  3. ameloblasts

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

It is a cell of newel crest origin that is part of the outer surface of the dental pulp and whose biological function is dentinogenesis, which is the formation of dentin.

Multiple choice

The hardest part of a tooth is the

  1. dentine

  2. enamel

  3. pulp

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

The hardest part of a tooth is the enamel. It forms the outer layer. Enamel is made up of a mineral called hydroxylapatile which is the name for crystallivl calcium phosphate.

Multiple choice

The incisor tooth is meant for

  1. biting and cutting

  2. chewing

  3. munching and chewing

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

The incisor tooth is meant for biting and cutting incisors are the front teeth present in most retardant mammals. They are located is the premaxilla above and on the moudible below. Humans have a total of eight.

Multiple choice

Diastema is associated with

  1. presence of certain teeth

  2. absence of certain teeth

  3. absence of tongue

  4. presence of tongue
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diastema is associated with absence of certain tooth. It is a space or gap between two teeth. Many species of mommals have distemata as a normal feature. It is a adjustable dental condition.

Multiple choice

Mastication or chewing is the process by which food is crushed and ground by teeth. Which of the following statements does NOT characterise mastication in humans?

  1. The feedback from proprioceptive nerves in teeth and the temporomandibular joints govern the creation of neural pathways.

  2. Mastication is mainly an unconscious act.

  3. The mandible is the only bone that moves during mastication.

  4. The muscles of mastication are all innervated by the the facial nerve (or CN VII).

  5. The motor program continuously adapts to changes in food type or occlusion.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Unlike most of the other facial muscles, which are innervated by the facial nerve (or CN VII), the muscles of mastication are all innervated by the trigeminal nerve (or CN V). More specifically, they are innervated by the mandibular branch.

Multiple choice

Dental formula of a rabbit is

  1. (2/1), (0/0), (3/2), (3/3)

  2. (2/1), (1/0), (3/2), (3/3)

  3. (2/1), (0/0), (2/2), (3/3)

  4. (1/1), (3/2), (0/0), (3/3)

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Correct Answer: (2/1), (0/0), (3/2), (3/3)

Multiple choice

Pulp cavity of teeth is lined by

  1. odontoblast

  2. chondroblast

  3. osteoblast

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

This is a cell in the pulp of tooth. It produces dentine.

Multiple choice

Wisdom tooth in human is

  1. 3rd molar and 4 in number

  2. 3rd molar and 2 in number

  3. 2nd molar and 2 in number

  4. 2nd molar and 4 in number
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A wisdom tooth or third molar is one of the three molars per quadrant of the human dentition.

Multiple choice

What is the hardest substance in the human body?

  1. Your head

  2. Fingernails

  3. Your knees

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

Tooth enamel is the hardest substance in the human body, even harder than bone, due to its high mineral content. Bones and fingernails are significantly softer.