Radiographic examination revealed the fracture line in maxillary right central incisor extending from incisal edge
through the pulp and extending into the cervical one third of the root.
The talon cusp was pyramidal in shape and extended from the cementoenamel junction to the incisal edge
(Figure 3 and 4).
The incisal edge
is slightly reduced & the finish line terminates on lingual surface.
An indentation on the palatal surface running from the incisal edge
to the cervical margin almost dividing the crown into two halves was visible with prominent cingulum.
4, 5) An extra cusp like structure on a tooth to be called as a talon cusp, it should extend at least 1mm or more beyond Cemento-Enamel Junction (CEJ) or half the distance from CEJ to the incisal edge
With an upper incisal edge
as a guide, a pencil line is drawn on a lower incisor when the teeth are in centric occlusion.
In case of mild to moderate irritation to the tongue, conservative treatment such as smoothing the incisal edge
with an abrasive instrument is advocated to alleviate feeding difficulties or complications like Riga-Fede disease.
However, in such a case, the operator must create both the chromatic dentin layer incorporating the contours and mamelons as well as the translucent enamel layer with the replication of the natural halo effect at the incisal edge
The bite planes contacted the incisal edge
of the lower incisors in occlusion, and the upper and lower molars were separated immediately.
But the tooth most often chosen is the maxillary lateral incisor and the stones are placed towards the incisal edge
After sketching the maxillary central incisor type from the lateral cephalometric radiographs, the superius point of the incisal edge
was joined with the middle point of the cementoenamel junction to depict the crown axis, and the middle point of the cementoenamel junction was joined with the root apex to depict the longitudinal axis.
Small guiding notches on the approximal surfaces of the tooth were placed with a bur at a distance of 3mm from incisal edge
in all the specimens.
According to studies by Maritato and Douglas the lip support is a better guide of tooth position than of incisal edge
The most noticeable differences in the mean values of length were found in studies that measured extracted teeth,13,14 that is, from the incisal edge
to the cementoenamel junction rather than the gingival margin, leading to greater length values and therefore smaller ratios (width/ length ratio of 78% for central incisors).
Pre operative maximum mouth opening was measured by using the millimeter scale from the upper incisal edge
to the lower incisal edge
of central incisors.