House's palatal throat form classification

Based on imaginary line drawn between hamular notches.

  • Class I
    • 5-13 mm posterior, provides the most amount of tissue for posterior palatal seal or post dam. Ideal retention.

  • Class II
    • 3-5 mm posterior, usually enough tissue for posterior palatal seal. Favorable retention.

  • Class III
    • 3-5 mm anterior, not enough tissue for posterior palatal seal. Poor retention.
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