Curvature feature
The curvature feature of the tooth is a distinguishing feature for determining whether a tooth belongs to the right or left half of the jaw .
The vestibular tooth surface has a greater curvature mesially than distally . The largest tooth diameter is therefore further mesial and not exactly in the middle. The transition to the mesial approximal surface is shorter and more curved than the transition to the distal approximal surface.
Viewed from the incisal side , the angle between the vestibular surface and the mesial approximal surface is less than 90 °. In contrast, the angle between the vestibular surface and the distal approximal surface is greater than 90 °.
The curvature feature is particularly pronounced in the incisors and canines , but can also be seen in the premolars .
In the lower jaw , the mesial root is more curved than the distal one.
The curvature feature is consistent with the curvature of the dental arch , the curvature of which increases mesially. However, the curvature feature on the dental crowns is much more pronounced than the geometric shape of the dental arch requires.
The first upper premolar has an inverted curvature feature.
Further identification features for the side membership of a tooth are:
The crown alignment is also used to assign posterior teeth to the upper or lower jaw .
See also
Individual evidence
- ^ Wolfgang Gühring, Joachim Barth: Anatomy: Special biology of the masticatory system . Verlag Neuer Merkur GmbH, 1992, ISBN 978-3-921280-84-3 , p. 176 ( google.com ).
