Agomphosis

The content of survey include oral hygiene state, gingivitis, periodontitis, dental caries, agomphosis, dental prosthesis, leukokeratosis.

10 fresh mandibles, 18 adult mandibles with total teeth and 20 volunteers without agomphosis were selected and exposed the inferior alveolar neurovascular bundle, the mandibular canal and the dental root of mandibular posterior teeth, scanned in series by CT, and then its three-dimensional image were reconstructed.

Furthermore, extraction spaces can be utilized to correct width discrepancy between arches (crossbite or scissor bite of posterior teeth), tooth size discrepancy (congenital agomphosis or Bolton index abnormity), and so forth.