A method and system are disclosed for finding virtual tooth features on
virtual three-dimensional models of the teeth of patients. The tooth
features comprise marginal ridges, cusp tips, contact points, central
groove and buccal groove. Tooth axes system plays a key role in
identifying the tooth features. An iterative method is disclosed for
improving the accuracy of the tooth axes system. A virtual
three-dimension model preferably obtained by scanning the dentition of a
patient forms the basis for determining the tooth features. Tooth
features are derived for all categories of teeth including molars,
premolars, canines and front teeth. Tooth features are very helpful and
used in planning orthodontic treatment. The tooth features are determined
automatically using the computerized techniques; and can be manually
adjusted when necessary.