Dentistry

1. (dental changes)
Name: Seyedsaeid Seyedraoufi Subject: Pediatric
McDonald - Dentistry for the Child and Adolescent. Mosby Elsevier, 2011
Lecturer: Prof: Thinathin Davithaia
Dec 2020

2. Two types of cells give rise to teeth
• Those two tissue are formed from ectoderm and
mesoderm.
 Epithelial cells
 Ectomesenchymal cells

3. Stages of tooth development

4.  The initial formation of an expansion of the basal layer of the
oral cavity immediately above the basement membrane.
(initiation)

5.  Resulting in the formation of
the tooth germ. (proliferation)

6.  Basal layer continues to exist and is now
divided into an inner and an outer dental
epithelium. (histodifferentiation)

7. (Morphodifferentiation)
 The cells find an
arrangement that
ultimately dictates the final
size and shape of the tooth.
The advanced bell stage

8.  Network or tissue
matrix of the tooth
is formed.

9. Tooth germ
(Dental organ)

10. Stages in tooth development
Physiological stages
• growth
• initiation
• proliferation
• histodifferentiation
• morphodifferentiation
• apposition
(stage occurs when the network or
tissue matrix of the tooth is formed)
• eruption
• attrition
(Bud stage)
(cap stage)
(bell stage)
(the advanced bell stage)
(Calcification)

11.  It belongs to a series of a
growth lines in tooth enamel
known as the Striae of Retzius