Dental Embryology

Question 1

Dentition

Answer 1

Natural Teeth in jaws

Question 2

Primary Dentition

Answer 2

Teeth that a child develops during prenatal period consists of 20 teeth.
A-T

Question 3

Permanent Dentition

Answer 3

Consists of 32 teeth that gradually erupts and replaces primary dentition.
1-32

Question 4

Odontogenesis

Answer 4

The process of tooth development

Question 5

Odontogenesis begins when?

Answer 5

Between the 6th and 7th week of prenatal development during the embryonic period.

Question 6

What are the stages of tooth development?

Answer 6

Initiation stage
Bud stage
Cap stage
Bell stage

Question 7

Initiation Stage weeks

Answer 7

6th to 7th week
Induction

Question 8

Bud Stage weeks

Answer 8

8th week
Proliferation

Question 9

Cap stage weeks

Answer 9

9th to 10th week
Proliferation, Differentiation, morphogenesis

Question 10

Bell stage weeks

Answer 10

11th to 12th week
Proliferation, Differentiation, morphogenesis

Question 11

Anodontia or hypodontia

Answer 11

Lack of initiation within the dental lamina results in the
absence of a single tooth or multiple teeth (partial) or an entire dentition

Question 12

Supernumerary teeth

Answer 12

(Initiation Stage) One or more extra teeth. Between the maxillary central incisors (mesiodens), distal to the maxillary third molars (distomolar or “fourth molar”), and in the premolar region (perimolar) of both dental arches

Question 13

Succedaneous

Answer 13

When Permanent teeth formed with primary predecessors, include the anterior teeth and premolars,

Question 14

Nonsuccedaneous

Answer 14

Permanent molars. Have no primary predecessors

Question 15

Outer Enamel Epithelium (OEE)

Answer 15

Outer cubodial cells of enamel organ. Serves as protective barrier for enamel organ

Question 16

Inner Enamel Epithelium (IEE)

Answer 16

Innermost tall columnar cells of enamel organ. Will differentiate into ameloblasts that form enamel matrix

Question 17

Mixed Dentition

Answer 17

Both primary and permeant teeth are present. Shedding of primary teeth and eruption of permanent teeth. Occurs between 6-12 years old.

Question 18

Dens in dente

Answer 18

(Cap stage) enamel organ may abnormally invaginate by growth into the dental papilla affecting permanent maxillary lateral incisors. Deep lingual pit that may need endodontic therapy.

Question 19

Amelogenesis

Answer 19

The appositional growth of enamel matrix, laying it down on their side of the now disintegrating basement membrane.

Question 20

Dentin Tubercles

Answer 20

Appear as small, round enamel extensions forming extra cusps. Occlusal complications. Caused by trauma, pressure, or metabolic disease.

Question 21

Dental Lamina

Answer 21

A induced layer produced in the 7th week as the oral epithelium grows deeper into the ectomesenchyme