Anatomy (Internal Organs+Glands) · MU Sofia

56. Teeth - permanent and deciduous. Development and histological structure of the tooth.

Compares deciduous and permanent teeth by number, function, size, crown, root and pulp chamber features, and eruption timing, then outlines odontogenesis from week 6 with its two tissue origins. Ends with a brief note on the histological structure of the tooth, contrasting acellular and cell-containing parts with odontoblasts.

Inside: 6 sections · 7 labelled pictures · 10 flashcards · 2 min

Topic 4 of 44 in the MU Sofia syllabus for Anatomy (Internal Organs+Glands) (Medicine, Years 1 and 2). The free AceMed note covers it in 6 sections, about 318 words (2 min of reading), with 10 flashcards.

In this note

  1. Introduction
  2. TEETH
  3. Deciduous Teeth :
  4. Permanent Teeth :
  5. Tooth Development: (Odontogenesis)
  6. Histological structure of the tooth:

TEETH

Teeth can be categorized into 2 main types : permanent and deciduous

Deciduous Teeth :

  1. 1. Number: Children typically have 20 deciduous teeth, consisting of 10 upper and 10 lower teeth.
  2. 2. Function: Deciduous teeth serve as placeholders for permanent teeth and aid in chewing, speech development, and facial structure.
  3. 3. Size: Deciduous teeth are smaller in size compared to permanent teeth.
  4. 4. Anatomy:
  • Crown: Deciduous teeth have a thinner enamel layer and a relatively larger crown compared to their roots.
  • Roots: Deciduous teeth have shorter roots that are more divergent and less complex than those of permanent teeth.
  • Pulp Chamber: The pulp chamber in deciduous teeth is larger in proportion to the size of the tooth.
  1. 5. Eruption: Deciduous teeth erupt between the ages of 6 months to 2-3 years, and they start shedding around the age of 6-7 years to make way for permanent teeth.

Permanent Teeth :

  1. 1. Number: Adults typically have 32 permanent teeth, including 16 upper and 16 lower teeth.
  2. 2. Function: Permanent teeth are designed to last a lifetime and serve essential functions such as chewing, speech, and maintaining facial structure.
  3. 3. Size: Permanent teeth are larger and stronger compared to deciduous teeth.

Anatomy:

  • Crown: Permanent teeth have thicker enamel layers and a more pronounced cusp pattern for efficient chewing.
  • Roots: Permanent teeth have longer, stronger roots that are firmly embedded in the jawbone.
  • Pulp Chamber: The pulp chamber in permanent teeth is smaller in proportion to the size of the tooth compared to deciduous teeth.
  1. 5. Eruption: Permanent teeth begin to erupt around the age of 6-7 years, starting with the first molars, and continue to erupt until early adulthood. The process of eruption and replacement of deciduous teeth with permanent teeth is called exfoliation.

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