Development of Occlusion in Dentition Lecture 4
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Questions and Answers

What is the definition of occlusion according to Ash and Ramfjord?

  • The contact relationship of the teeth in function and parafunction (correct)
  • The division of the alveolar processes into labio-buccal and lingual portions
  • The normal relation of the occlusal inclined planes of the teeth when the jaws are closed
  • The process of tooth formation and eruption
  • Which period of occlusal development occurs at birth?

  • Mixed dentition period
  • Permanent dentition period
  • Primary dentition period
  • Neo-natal period (correct)
  • What is the purpose of the lateral sulcus in the neonatal period?

  • To judge the inter-arch relationship (correct)
  • To cover the developing tooth sites
  • To divide the alveolar processes
  • To form the gum pads
  • How are the alveolar processes at the time of birth described?

    <p>Firm and covered by fibrous periosteum</p> Signup and view all the answers

    What does Angle define as occlusion?

    <p>The normal relation of the occlusal inclined planes of the teeth when the jaws are closed</p> Signup and view all the answers

    What is the development period that follows primary dentition?

    <p>Mixed dentition period</p> Signup and view all the answers

    What is the shape of the upper gum pad?

    <p>Horseshoe shaped</p> Signup and view all the answers

    What separates the gum pad from the palate in the neonatal period?

    <p>Gingival groove</p> Signup and view all the answers

    In the neonatal jaw relationships, what movements are mainly observed?

    <p>Vertical movements</p> Signup and view all the answers

    When does the labial frenum usually attach to the incisive papillary region?

    <p>At birth</p> Signup and view all the answers

    What is the prevalence of natal and neonatal teeth?

    <p>1:1000 and 1:30000 respectively</p> Signup and view all the answers

    What is the characteristic of the lower gum pad?

    <p>U-shaped</p> Signup and view all the answers

    What is the anterior jaw relationship seen at rest in neonates?

    <p><strong>Open bite with contact only at the molar region</strong></p> Signup and view all the answers

    What is characteristic of mandibular functional movements in neonates?

    Signup and view all the answers

    What is observed about natal and neonatal teeth at birth?

    Signup and view all the answers

    Study Notes

    Occlusion Definition and Development

    • According to Ash and Ramfjord, occlusion is defined as the contact of the incising and occlusal surfaces of the maxillary and mandibular teeth.
    • At birth, the period of occlusal development is characterized by a state of occlusal adaptation.

    Neonatal Period Characteristics

    • The lateral sulcus helps guide the mandible during suckling and swallowing in the neonatal period.
    • The alveolar processes at birth are described as being composed of soft, unmineralized bone.
    • The upper gum pad is shaped like a horseshoe.
    • The upper gum pad is separated from the palate by a groove.

    Jaw Relationships and Movements

    • In the neonatal period, the main jaw movements observed are downward and forward movements, facilitating suckling and swallowing.
    • The labial frenum usually attaches to the incisive papillary region at birth.
    • Mandibular functional movements in neonates are characterized by strong, rhythmic contractions.

    Natal and Neonatal Teeth

    • The prevalence of natal and neonatal teeth is low, affecting only 1 in 2,000 to 1 in 3,000 births.
    • Natal and neonatal teeth are observed to be small, poorly developed, and often loose at birth.
    • The lower gum pad is characterized by a prominent, rounded shape.
    • The anterior jaw relationship seen at rest in neonates is end-to-end.

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