Dental Anatomy: Theories of Tooth Eruption
18 Questions
4 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

How many teeth will erupt every 4 months starting at the age of 7 months?

  • 4 (correct)
  • 3
  • 2
  • 5
  • At what age will the 4 teeth erupt according to the ERUPTION Rule of 4?

  • 7 months (correct)
  • 9 months
  • 5 months
  • 11 months
  • How many years does it take for the root formation of the maxillary central incisor to complete?

  • 11 years
  • 10 years (correct)
  • 9 years
  • 12 years
  • What is a characteristic of enamel?

    <p>It is highly mineralized and acellular</p> Signup and view all the answers

    At what age will the second molar erupt in the maxillary permanent teeth?

    <p>12-13 years</p> Signup and view all the answers

    What is the age range for the eruption of the third molar in the maxillary permanent teeth?

    <p>17-21 years</p> Signup and view all the answers

    What is the primary mechanism of tooth eruption according to the Bone Growth Theory?

    <p>Growth of the alveolar bone pulls the tooth outwards</p> Signup and view all the answers

    What is the name of the theory that suggests eruption is due to the increased blood pressure in the diminishing pulp cavity?

    <p>Vascular Pressure Theory</p> Signup and view all the answers

    According to the Pulp Growth Theory, what provides the eruptive force for tooth eruption?

    <p>Growth of the pulp</p> Signup and view all the answers

    At what age do central incisors typically erupt in the maxilla?

    <p>11-13 months</p> Signup and view all the answers

    How many teeth are present in a 15-month-old child?

    <p>12</p> Signup and view all the answers

    What is the name of the theory that suggests the presence of many blood vessels in the apical region causes the formation of tissue fluid, leading to tooth eruption?

    <p>Vascularity or Tissue Fluid Pressure Theory</p> Signup and view all the answers

    What is the reason for localized failure in the formation of accessory canals?

    <p>Failure in the formation of Hertwig's sheath during embryonic stages</p> Signup and view all the answers

    What type of tooth movement is responsible for maintaining the position of the erupted tooth in occlusion?

    <p>Posteruptive tooth movement</p> Signup and view all the answers

    Which theory of eruption is disproven by the experiment where the pulp was removed and root filled, and eruption ceased?

    <p>Pulp growth theory</p> Signup and view all the answers

    What happens to the REE during the eruption of a tooth into the oral cavity?

    <p>It fuses with the oral epithelium, forming the dentogingival junction</p> Signup and view all the answers

    What is the result of extracting an antagonist after root formation is complete?

    <p>Supra-eruption may occur</p> Signup and view all the answers

    What is the description of the tooth movement made by the deciduous and permanent tooth germs within tissues of the jaw before they begin to erupt?

    <p>Preeruptive tooth movement</p> Signup and view all the answers

    Study Notes

    Eruption of Primary Teeth

    • 4 teeth erupt every 4 months starting at the age of 7 months.
    • At 7 months, 4 teeth are present (A).
    • At 11 months, 8 teeth are present (AB).
    • At 15 months, 12 teeth are present (ABD).
    • At 19 months, 16 teeth are present (ABDC).
    • At 23 months, 20 teeth are present (ABDCE).

    Eruption and Root Completion of Permanent Teeth

    Maxillary Teeth

    • Central incisor: eruption at 7-8 years, root formation complete at 10 years.
    • Lateral incisor: eruption at 8-9 years, root formation complete at 11 years.
    • Canine: eruption at 11-12 years, root formation complete at 13-15 years.
    • First premolar: eruption at 10-11 years, root formation complete at 12-13 years.
    • Second premolar: eruption at 10-12 years, root formation complete at 12-14 years.
    • First molar: eruption at 6-7 years, root formation complete at 9-10 years.
    • Second molar: eruption at 12-13 years, root formation complete at 14-16 years.
    • Third molar: eruption at 17-21 years, root formation complete at 18-25 years.

    Mandibular Teeth

    • Central incisor: eruption at 6-7 years, root formation complete at 10 years.
    • Lateral incisor: eruption at 7-8 years, root formation complete at 11 years.
    • Canine: eruption at 9-10 years, root formation complete at 13-15 years.
    • First premolar: eruption at 10-12 years, root formation complete at 12-13 years.
    • Second premolar: eruption at 11-12 years, root formation complete at 12-14 years.
    • First molar: eruption at 6-7 years, root formation complete at 9-10 years.
    • Second molar: eruption at 11-13 years, root formation complete at 14-16 years.
    • Third molar: eruption at 17-21 years, root formation complete at 18-25 years.

    Dental Tissues

    • Enamel: highly mineralized and acellular.

    Theories on Eruption

    • Root Growth Theory: pressure from the elongating root against the base of the alveolar crypt causes the eruption of the tooth.
    • Vascular Pressure Theory: eruption is due to increased blood pressure in the diminishing pulp cavity as the tooth develops.
    • Pulp Growth Theory: growth of the pulp provides eruptive force.
    • Bone Growth Theory: growth of the alveolar bone pulls the tooth outwards by the periodontal fibers.
    • Vascularity or Tissue Fluid Pressure Theory: presence of many blood vessels in the apical region causes the formation of tissue fluid in a small closed space, which exerts a steady pressure.

    Eruption and Root Completion of Primary Teeth

    Maxillary Teeth

    • Central incisor: eruption at 10 (8-12) months, root formation complete at 1 ½ years.
    • Lateral incisor: eruption at 11 (9-13) months, root formation complete at 2 years.
    • Canine: eruption at 19 (16-22) months, root formation complete at 3 ¼ years.
    • First molar: eruption at 16 (boys: 13-19 months, girls: 14-18 months), root formation complete at 2 ½ years.
    • Second molar: eruption at 29 (25-33) months, root formation complete at 3 years.

    Mandibular Teeth

    • Central incisor: eruption at 8 (6-10) months, root formation complete at 1 ½ years.
    • Lateral incisor: eruption at 13 (10-16) months, root formation complete at 1 ½ years.
    • Canine: eruption at 20 (17-23) months, root formation complete at 3 ¼ years.
    • First molar: eruption at 16 (14-18) months, root formation complete at 2 ¼ years.
    • Second molar: eruption at 27 (boys: 23-31 months, girls: 24-30 months), root formation complete at 3 years.

    Miscellaneous

    • Accessory canals: formed due to localized failure in the formation of Hertwig's sheath during embryonic stages of tooth formation.
    • Eruptive movements of teeth: preeruptive, eruptive, and posteruptive.
    • At 15 months, the child has 12 teeth (ABD).

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge of tooth eruption theories, including the root growth theory and vascular pressure theory, and their supporting evidence. Learn about the different mechanisms behind tooth eruption and how they impact dental development.

    More Like This

    Tooth Eruption Theory
    5 questions

    Tooth Eruption Theory

    BestSellingEinsteinium avatar
    BestSellingEinsteinium
    Dental Anatomy and Tooth Development
    39 questions
    2.2
    152 questions

    2.2

    InnocuousSilver3002 avatar
    InnocuousSilver3002
    Tooth Eruption and Exfoliation
    44 questions
    Use Quizgecko on...
    Browser
    Browser