Lecture # (5)
Sheet written by Majdi Salameh
* Permanent maxillary lateral incisor :
- Sometimes the Cingulum is so large that they call it Talon Cusp. Talon Cusp is mostly found in permanent maxillary lateral incisor but rarely found in primary teeth . ( Talon Cusp : is a very enlarged cingulum and sometimes looks like a separated cusp ) .
- The Peg shaped lateral incisor : instead of having a normal incisal edge .. the tooth is found pointed .. but it is unlike the Canine .. because the Canine tip is in the middle of the tooth ... In the peg shape, the tip is located in the mesial side of the tooth .
- palatogingival groove : It starts from the lingual fossa , it interrupts the cingulum and it continues for a distance in the root surface.
- Tuberculum dentale : It is a cingulum enlarged a little bit and smaller than the Talon cusp . If it gets really large it's called Talon cusp but as long as it is small in size it's called Tuberculum dentale .
Labial Aspect :
- Mesial contact point location is higher than its location in the Maxillary Central incisor ... the location of the mesial contact point of the maxillary lateral incisor is on the junction between the incisal and middle third , where its location in Maxillary Central incisor is within the incisal third near the incisal edge .
- Distal contact point location is in the middle of the middle third (which means that it's in the middle of the crown ).
- Outlines are generally more rounded in the lateral incisor than the central incisor .
- Cervical line is more convex .
- The lateral incisor is smaller in all dimensions than Central incisor except in root length which they're in both the same length
- Mesial incisal angle is rounded and not sharp . Distal incisal angle is even