Odontogenesis Tooth Development

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Author(s): Cristiane Shimazu

Introduction

• Period when teeth are formed, within the bone: maxilla and mandible
• Deposition of dentin and enamel and formation of the crown of the future tooth

Beginning of Dentistry

• Primary teeth: gestation - 5th - 6th week of intrauterine life (VIU)
• Permanent teeth: the child's first year of life
• During VIU, ectomesenchyme is formed (embryonic tissue that gives origin to tooth structure: enamel, dentin, pulp and periodontal tissues),interacts with the oral epithelium to initiate odontogenesis

Stages of Dentistry

• The progressive and continuous modification of the tooth germ is characterized by 5 stages respectively:
• This sequence of images correspond to cross-sectional histological sections

1. Button,
2. Hood or Cap,
3. Bell or Bell,
4. Coronogenesis,
5. Rhizogenesis.

1 - Button Phase

• Invagination of the oral epithelium towards the ectomesenchyme
• Condensation of the ectomesenchyme

2 - Hood or Casquete Phase

• Proliferation of epithelial cells leaving the tooth germ with the shape of a hood
• Formation of enamel

3 - Bell or Bell Phase

• The enamel organ has a bell-like appearance and surrounds the dental papilla
• From that moment on, the dental papilla becomes the dental pulp

4 - Coronogenesis Phase

• Deposition of dentin and enamel and formation of the crown of the future tooth

5 - Rhizogenesis Phase

• Starts from the Epithelial Sheath of Hertwig and progresses in an apical direction
• This epithelialsheath that will command root formation and is responsible for guide the development of supporting tissues: cementum, ligament periodontal and alveolar bone

References

1. Junqueira LC, Carneiro J (2018) Basic histology. 13th Ed Rio de Janeiro: Guanabara
2. Katchburian E, Arana V (2017) Oral histology and embryology. 9th Ed. Rio de Janeiro: Guanabara
3. Moore K L, Persaud T V N (2016) Clinical embryology. 10th Ed. Rio de Janeiro:
4. Nanci A (2019) Oral histology: development, structure and function. 14th Ed Rio de Janeiro:
5. Ten C (2019) Oral Histology. 9th Ed Rio de Janeiro: Guanabara Koogan.

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