Morphogenese et etablissement de l'occlusion (3)

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    What initiates the formation of the dental arch?

    Proliferation of the epiblast in the mouth.

    What is the role of the dental lamina?

    It gives rise to the buds of temporary teeth.

    How does the dental lamina of replacement function?

    It produces new epithelial extensions for permanent teeth.

    What happens during the eruption of a tooth?

    A tooth moves from its intra-osseous site to functional placement.

    What characterizes the passive eruption phase?

    Calcification of the crown begins without the germ rising.

    What occurs in the active pre-functional eruption phase?

    The tooth erupts into the oral cavity and contacts antagonists.

    What is the significance of the occlusal adaptation phase?

    The erupting tooth seeks stable contacts with antagonists.

    What defines the temporary dentition period?

    It lasts from 6 months to 30 months after birth.

    What is the average eruption time for the first permanent molar?

    Around 6 years of age.

    What distinguishes the types of temporary dental arches?

    Presence or absence of diastemas simiens.

    What is the 'lee way space'?

    Space gained for permanent teeth after losing temporary ones.

    How does the dental arch shape change in permanent dentition?

    It becomes elliptical in the maxilla and parabolic in the mandible.

    What is the curve of Spee?

    A sagittal curve starting at the lower canine and following molar cusps.

    What is the relationship between maxillary and mandibular arches?

    Maxillary arch is wider and longer than the mandibular arch.

    What defines Angle's Class I occlusion?

    The lower first molar is mesial to the upper first molar by half a cusp.

    What is the position of rest in occlusion?

    Mandible's position with minimal muscle tension and no tooth contact.

    What occurs during the propulsion movement?

    Mandible moves forward while incisors glide over each other.

    What is the function of the canine during lateral movement?

    It guides the movement while other teeth disocclude.