Central maxillary incisors

• Have ridges or edges, not cusps
• Incisal ridge: Portion of crown which makes up complete incisal portion in newly erupted teeth
• Incisal edge only occurs after occlusal wear has caused a flattened surface linguoincisally
• Central maxillary incisors are in contact with the other through the mesial surface
• They are the widest mesiodistally of any other teeth
• Usually 10-11mm from the cervical line to the incisal edge
• Labial aspect: Mesiodistally measure around 8 - 9 mm and where the root meets the crown in will be around 1.5 - 2 mm less
• Labial aspect: outline of crown is slightly convex as the crest of curvature approaches the mesioincisal angle. The distal outline of the crown is more convex with the crest of curvature being higher towards the cervical line.
• Labial aspect: The mesioincisal angle is sharper than the distoincisal angle
• Labial aspect: After the obliteration of the mamelons, the incisal outline is usually regular and straight
• Labial aspect: the cervical outline is semi-circular with the curvature facing the root, mesiodistally
• Labial aspect: The root is cone shaped with a relatively blunt apex, the outline mesially and distally is regular. The root is usually 2 - 3 mm longer than the crown but this can vary
• Lingual aspect: The lingual aspect has more concavities and convexities. It contains a cingulum immediately below the cervical line. Medially and distally there are marginal ridges which are confluent with the cingulum. This forms a shallow fossa in between the ridges and incisal to the cingulum, called the lingual fossa.
• Lingual aspect: The linguoincisal edge is raised slightly, being on level with the marginal ridges.
• Lingual aspect: The crown and root taper lingually allowing for a better callibration of the two labial line angles than the lingual angles. The lingual portion of the root is also narrower than the labial portion
• Lingual aspect: the root tends to be triangular with rounded angles. The mesial side is slightly longer than the distal side.
• Is the crown calibration of the line angles higher labially or lingually?

  labially
• Is the root always longer than the crown?

  no
• The mesiolabial portion of the incisor is shorter than the distolabial portion?

  No
• Lingually, there is a convex lingual fossa?

  no
• Mesial aspect: It has a triangular shape. The apex lines up with the incisal ridge. The base is at the cervix. The labiolingual diameter is about 7 mm.
• Mesial aspect: The crown's labial outline from the crest to the incisal edge is slightly convex
• The crown's labial outline is slightly convex?

  yes
• Mesial aspect: the lingual outline is convex at the point where it meets the crest of curvature at the cingulum, it becomes concave at the mesial marginal ridge and slightly convex again coming to the linguoincisal ridge and incisal edge
• Mesial aspect: The cervical line outlines the cementoenamel junction curves incisally toa noticeable degree
• Mesial aspect: the root is cone shaped and the apex is usually blunt and round
• Distal aspect: The cementoenamel junction marked by the cervical line is usually less incisal then the one on the mesial aspect.
• Incisal aspect: Centred over the root and superimposed over it, making it invisible.
• Incisal aspect: The labial aspect is relatively broad and flat especially towards the incisal third. The cervical part of the crown is convex
• Incisal aspect: The incisal edge is slightly inclined lingually
• Incisal aspect: The mesiodistal calibration at the labial line angles is greater than that of the lingual ones
• Incisal aspect: The mesiodistal calibration at the labial line angles is greater than that of the lingual ones?

  yes
• Incisal aspect: The lingual portion shows more variation that the labial portion. The line drawn from the mesioincisal angle to the cingulum will be longer than the one drawn from the distoincisal angle. The lingual outline gets smaller towards the cingulum
• Incisal aspect: The crown conforms to a triangular shape and so does the root