small presentation about Stages of tooth development

1. Stages of tooth development
Amjad al.bleahid

2. Introduction
• The developmental stages are based on
the shape of the epithelial part
(ectodemal component) of the developing
tooth germ
• These stages are called the bud, cap & the
bell stages

3. A tooth germ consist of three
parts
1-An enamel organ, which is derived from
the oral ectoderm
2- A dental papilla, which is derived from
the ectomesenchyme
3-A dental sac, which is also derived from
ectomesenchyme

4. A) Enamel organ
1-Outer enamel epithelium
2-Inner enamel epithelium
3-The stellate reticulum

5. B) Dental papilla
• It is a condensation of the
ectomesenchyme at the epithelial
concavity (Cellular condensation)

6. c) Dental sac
• There is marginal condensation of the
ectomesenchyme surrounding the enamel
organ & dental papilla (Cellular condensation)

7. • The enamel organ produces enamel
• Dental papilla produces dentin & pulp
• Dental sac produces cementum, periodontal
ligament & alveolar bone

8. Stages of tooth development

9. • 1-Bud stage
• 2-cap stage
• 3-bell stage

10. 1-Bud stage
• At certain points along the dental lamina
• At the site of the future deciduous teeth
• The epithelial cells proliferate
to form little buds called
enamel organ which
grow into the ectomesenchyme

11. 2-Cap stage
• There is uneven growth of the bud, as the
outer margins grow faster than its center
which leads to change in the shape of the
tooth germ to be in a cap form

12. 3-Bell stage
• Continued uneven growth of the tooth
germ leads to the next stage of tooth
development, the bell stage give tow
stages :
• 1-Early bell stage
• 2-late bell stage

13. A) Early bell stage
(Histodifferentiation and morphodifferentiation)
the tooth crown assumes its final shape

14. B) Late bell stage
• (appositional stage), this stage is
associated with the formation of dental
hard tissues

15. Review

16. • The enamel organ produces ……………
• Dental papilla produces ……………. & ……………
• Dental sac produce …………… , ……………… & ………………

21. References
• Avery, J.K., Daniel, J & Chiego, Jr: Essential of
Oral Histology and Embryology. A clinical
Approach 4th ed 2013
• Avery, J.K. : Oral development and
Histology, 3rd ed New York Thieme 2002

22. Thank you