Dentition Periods and Tooth Eruption

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Questions and Answers

Which of the following describes the periods of dentition?

  • Primary Dentition - only deciduous teeth are present; 6 months-6 years (correct)
  • Permanent Dentition - only primary teeth are present; 12 years-rest of life
  • Mixed Dentition - both deciduous and permanent teeth are present; 6 years-12 years (correct)
  • All of the above

What is the first permanent tooth to erupt?

Mandibular first molar

Which is the last deciduous tooth to exfoliate?

Maxillary second molar

What does the term 'exfoliated' mean in dental anatomy?

<p>Shed</p> Signup and view all the answers

What is resorption in the context of deciduous teeth?

<p>The natural process by which deciduous roots are 'melted away'</p> Signup and view all the answers

What are succedaneous teeth?

<p>Permanent teeth that replace exfoliated deciduous teeth (A)</p> Signup and view all the answers

Flashcards

Primary Dentition

Only deciduous teeth are present, typically from 6 months to 6 years old.

First permanent tooth to erupt

The mandibular first molar.

Last deciduous tooth to exfoliate

The maxillary second molar.

Exfoliated (in dental context)

To shed or fall off naturally.

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Resorption (of deciduous roots)

The natural process where deciduous tooth roots are dissolved away.

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Succedaneous teeth

Permanent teeth that replace exfoliated deciduous teeth.

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Study Notes

Dentition Periods

  • Primary Dentition: Lasts from 6 months to 6 years, featuring only deciduous (baby) teeth.
  • Mixed Dentition: Spanning from 6 to 12 years, characterized by the presence of both deciduous and permanent teeth.
  • Permanent Dentition: Begins at 12 years and extends throughout life, where only permanent teeth are present.

Eruption and Exfoliation

  • The first permanent tooth to erupt is typically the mandibular first molar.
  • The last deciduous tooth to exfoliate is usually the maxillary second molar.
  • Exfoliation refers to the shedding of deciduous teeth, which allows permanent teeth to erupt into the designated space.

Tooth Resorption

  • Resorption: A natural process that involves the dissolution of deciduous roots, facilitating their exfoliation to make way for permanent teeth.

Succedaneous Teeth

  • Succedaneous Teeth: A total of 20 permanent teeth that replace exfoliated deciduous teeth, referred to as "succeeding" teeth.
  • Notably, the only permanent teeth that are not succedaneous are the molars; premolars succeed the deciduous molars.

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