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Crowding. If the space between two teeth next to an unerupted tooth is less than 4mm then the tooth is regarded as impacted and grade 5i is recorded. |
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Contact point displacements. Measured between anatomical contact points when permanent teeth deviate from the line of the arch. Not measured if any deciduous teeth are involved. |
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Impeded eruption.
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Tooth unerupted due to contact of or close approximation of adjacent teeth - That's an impaction and it's 5i |
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Tooth erupted but not enough room? Then look at the contact point displacement. If the tooth has only partially erupted and has tipped against the adjacent tooth then that's a 4t. |
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Spacing. Spacing is not recorded. |