UPPER LATERAL INCISOR
- chronology
- Start of calcification 3-4 months
- End of coronary calcification: 4-5 years
- Age of eruption: 8-9 years
- End of apical calcification: 11 years
3. description:
- Vestibular face:
- The crown:
- The outline is characterized by roundness,
the appearance is slender.
- The free edge is rounded, its inclination
in the distal direction is marked.
- The mesial angle is a rounded right angle while
the distal is strongly rounded.
- The mesial contour is less convex
than the distal contour.
- The vestibular cervical contour is more
ogival than that of the central incisor
- The maximum mesial convexity is located in the incisal 1/3. The maximum distal convexity is located at the junction of the incisal 1/3 and the medial 1/3.
- Two depressions delimit three lobes, the distal lobe is the most important and seems to stand out from the rest of the face.
- The root:
- it is conical
- It is long and narrow in the mesio-distal direction.
- The apical end is inclined to the distal side
- Palatal face:
a. The crown:
- Appearance identical to the central incisor,
- The oral structures are more accentuated; the palatine fossa is deeper.
- The cingulum usually has only one lobe.
- Very marked furrows separate the palatine structures. Pits occupy
sometimes the bottom of the cingulate fossae.
- Mesial face:
- The crown
- Same appearance as the central incisor,
- the cingulate contour is more pronounced,
- The incisal edge is rounded and has a palatal inclination.
- The entire mesial surface is convex. It tends to become flat in the cervical region.
- The proximal mesial contact area is larger than the central incisor, closer to the junction of the incisal 1/3 and the medial 1/3.
- The root:
- The vestibulolingual diameter is larger than the diameter
mesio-distal.
- A shallow longitudinal depression marks the mesial face
root
- Distal face : it is identical to the mesial view. The neck is less marked than on the mesial face .
- Occlusal face:
- Coronal contour is ovoid and smaller than that of the central incisor.
- The vestibular contour is clearly rounded.
- The mesial contour is longer than the distal contour.
- The incisal edge has two portions, the distal of which slopes in a palatal direction.
- The cingulum is strongly convex and offset to the distal side.
UPPER LATERAL INCISOR
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