Dental Morphology Of The Mandibular Central Incisor
The surface of the crown is nearly smooth. The crown is very narrow with respect to its length. The mesioincisal and distoincisal angles are nearly right angles, or only a little rounded. N.B. This tooth is so symmetrical that it is quite difficult to tell left from right unless on models or in the mouth. Both mesial and distal contact points are in the incisal third, almost level with the incisal edge. This phenomenon is unique to mandibular central incisors. The root is very narrow mesiodistally, but wide faciolingually. The lingual surface is smooth and shallow, without any grooves, accessory ridges or pits. The labiolingual dimension is greater than the mesiodistal dimension. This is quite different from the measurements of the maxillary incisors and an important mark to distinguish mandibular incisors from maxillary incisors.