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

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Cheek teeth are

  1. Inscisors and canines

  2. Canines and premolars

  3. Premolars and molar

  4. Canines and molars
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cheek teeth or post canines comprise the molar and premolar teeth in mammals. Cheek teeth are multicuspidate (having many cusps or tubercles). Mammals have multicuspidate molars.

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Incisor present in which bone of human jaw?

  1. Premaxilla

  2. Maxilla

  3. Palatine

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

  • The premaxilla is one of a pair of small cranial bones at the very tip of the upper jaw of many animals, usually, but not always, bearing teeth. 
  • In humans, they are fused with the maxilla and usually termed as the incisive bone (the portion of the maxilla adjacent to the incisors). Hence,  Incisor is present in premaxilla of the human jaw.
So, the correct answer is 'premaxilla'.

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Total number of teeth in rabbit is

  1. 43

  2. 24

  3. 28

  4. 32
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rabbit is herbivorous animal and depends on cellulose based food. It has no canines in jaw. The dental formula is  2 0 3 3 / 1 0 2 3 for incisors, canine, premolar and molars in each jaw. The total number of teeth in upper jaw are 16 and 12 teeth in lower jaw. Thus total number of teeth are 28.

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If the dental formula of rabbit is $\frac { 2033 }{ 1023 } $. What does it show?

  1. Total number of teeth in rabbit is 15.

  2. Number of total incisors in rabbit is 3.

  3. Diastema is present between incisors & premolars.

  4. In the formula 2033 is for adult and 1033 is for young ones.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rabbit is herbivorous animal and depends on cellulose based food. It has no canines in jaw. The dental formula is  2 0 3 3 / 1 0 2 3 for incisors, canine, premolar and molars in each jaw. Thus the canines are absent. There is a gap in both the jaws at the location of canines. It is called as diastema. The total number of teeth in upper jaw are 16 and 12 teeth in lower jaw. The total number of teeth are 28. 

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In rabbit, hard palate is formed of

  1. Premaxilla, vomer and dentary bones

  2. Premaxilla, maxilla and palatine bones

  3. Sphenoid, nasal and dentary bones

  4. Nasal, maxillae and ethmoid bone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Palate is differentiated into two parts- (i) Hard Palate  and (ii) Soft Palate. 

The hard palate is anterior part of the palate. lt is made up of Maxilla and palatine bones in human. But in Rabbit it is made of Pre-maxilla, maxilla and palatine bones. On the ventral surface of hard palate, some projection or transverse ridges are present, which are called as palatine rugae. These rugae prevent slipping out of the food from buccal cavity during mastication. These rugae are well developed in carnivorous animals. In rabbit, one pair opening of nasopalatine duct is present at the anterior part of hard palate, these connect the buccal cavity to the nasal passage. Some olfactory receptors are also found in nasopalatine duct, which are called as Jacobsons organ. It makes them aware of the smell of food while chewing.

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Lower jaw is composed of ............. in rabbit.

  1. Dentary

  2. Maxilla

  3. Premaxilla

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

Teeth are ecto-mesodermal in origin. Major portion of teeth arises from Dermis. Part of tooth present outside the gums only is derived from ectoderm or Epidermis (Enamel part). In human teeth of upper jaw are attached to the Maxilla bone. While teeth of lower jaw are attached to mandible jaw. But in rabbit upper incisors are attached to premaxilla. While upper premolars and molars attached to the maxilla bone. While lower teeth are attached to dentary bone. Dentary comprises of the lower jaw.

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Carnivorous animals use these teeth to tear flesh.

  1. Incisors

  2. Canines

  3. Premolars

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

Carnivorous animals are meat eating animals. They use canines which are long, pointed teeth near the front of their jaw for tearing of flesh. Other teeth along the side of their jaw, molars and premolars, have uneven edges and are used for shearing the food in smaller pieces.

So, option B is the correct answer.

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Human dentition is described as

  1. Heterodont, diphyodont and thecodont

  2. Heterodont, monophyodont and thecodont

  3. Heterodont, diphyodont, thecodont and bundodont

  4. Heterodont, polyphyodont and pleurodont
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Human dentition can be describes as:

Heterodont: the teeth are morphologically different from each other.
Diphyodont: there are two sets of teeth that appear in the lifetime, the milk-teeth and the permanent teeth.
Thecodont: the teeth are firmly enclosed within the deep socket of the jaw bone.
Hence, the correct answer is 'Heterodont, diphyodont and thecodont'.

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The teeth which help us in chewing and grinding the food we eat are?

  1. Canines

  2. Incisors

  3. Premolars

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

Molars are broad, flat teeth located at the back of the mouth, specially adapted for crushing, grinding, and chewing food into smaller pieces suitable for digestion.

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Maximum number of teeth found in placental mammals is

  1. 32

  2. 54

  3. 44

  4. 22
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Placental mammals have a maximum of three incisors and one canine per quadrant and usually have no more than four premolars and three molars per quadrant. Following dental formula represents the number of tooth in placental mammals.
Placental mammals =  I 3/3 C 1/1 P 4/4 M 3/3 =44

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Number of teeth in man which grow twice are

  1. 4

  2. 8

  3. 12

  4. 28

  5. 20
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Humans, like other mammals, are diphyodont, meaning that they develop two sets of teeth. Among deciduous (primary) teeth, ten are found in the maxilla (upper jaw) and ten in the mandible (lower jaw), for a total of 20. The dental formula for primary teeth is 2.1.2/2.1.2.

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Diastema is

  1. A part of pelvic girdle in rabbit.

  2. A type of tooth in rabbit.

  3. Space in teeth lines in some mammals.

  4. Structure in eye of rabbit.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A diastema is a space or gap between two teeth. It happens when there is an unequal relationship between the size of the teeth and the jaw.

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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

Odontoblast is one of the dentin-forming cells, derived from mesenchyme of neural crest origin, lining pulp cavity of teeth; arranged in a peripheral layer in dental pulp, each with an odontoblastic process extending part way into dentinal tubules.

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In human teeth, which of the following helps in cutting?

  1. Wisdom tooth

  2. Incisor

  3. Molar

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

The four front teeth in each arch are called incisors, and their function is to cut food with their sharp thin edges.