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

Odd numbers of the teeth are cut by which indexing?

  1. Direct indexing

  2. Angular indexing

  3. Compound indexing

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

Compound indexing is specifically used for indexing operations that cannot be performed by simple or direct indexing, including odd numbers of teeth.

Multiple choice

Dental formula of man is

  1. 1223/2223

  2. 2132/2132

  3. 2123/2123

  4. 2213/2213
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dental formula of man is 2123/2123. The formula 2.1.2.3 for upper and lower teeth indicates 2 incisors, 1 canine, 2 premolars, and 3 molars on one side of the both upper and lower arches.

Multiple choice

Jaw suspension characteristic of mammals is :

  1. amphistylic

  2. craniostylic

  3. autocliastylic

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

Jaw suspension characteristic of mammals is 'craniostylic'; considered it as a modification of autostylic suspension. Upper jaw fuses throughout its length with cranium and hyomandibular forms the ear ossicle stapes. 

Multiple choice

Teeth of rabbits are

  1. thecodont

  2. diphyodont

  3. heterodont

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The teeth of rabbit are of several types (Heterodont) with roots in sockets of jaw bones (thecodont) and occur in two sets in life (diphyodont).

Multiple choice

Bulk of the tooth in mammals is made up of

  1. dentine

  2. enamel

  3. pulp cavity

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

 Bulk of the tooth in mammals is made up of dentine.It is 70% mineral and acellular, as hydroxyapatite crystals, and 30% organic as water, collagen and mucopolysaccharide.

Multiple choice

Mastication is the first step of digestion which increases the surface area of foods. Which of the following statements regarding the mastication in humans is FALSE?

  1. The motor program continuously adapts to changes in food type or occlusion.

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

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

  4. Mastication is mainly an unconscious act.

  5. The feedback from proprioceptive nerves in teeth and the temporomandibular joints govern the creation of neural pathways.
Reveal answer Fill a bubble to check yourself
B 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.