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How do we classify occlusion of primary teeth?

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Final answer:

The classification of occlusion of primary teeth includes Class I, Class II, Class III, and End-to-End Occlusion based on the relationship between the upper and lower teeth.

Step-by-step explanation:

Classification of occlusion of primary teeth is based on the relationship between the upper and lower teeth when the jaws are closed. There are four types of occlusion:

  1. Class I Occlusion: The upper first molar aligns with the lower first molar, and the other teeth fit together properly.
  2. Class II Occlusion: The upper first molar is positioned more forward than the lower first molar, resulting in the upper teeth protruding.
  3. Class III Occlusion: The lower first molar is positioned more forward than the upper first molar, resulting in an underbite where the lower teeth stick out in front of the upper teeth.
  4. End-to-End Occlusion: The upper and lower first molars touch each other directly without the presence of overbite or underbite.

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