Dental Anatomy: Mandibular Canine PDF

Lecture 8 Dental anatomy Dr. Shatha Abdul Wahid Mandibular canine ❖ The mandibular canines are similar to maxillary canines but narrower mesiodistally and labiolingually....

Lecture 8 Dental anatomy Dr. Shatha Abdul Wahid Mandibular canine ❖ The mandibular canines are similar to maxillary canines but narrower mesiodistally and labiolingually. ❖ The crown height of the mandibular canine is slightly longer than that of the maxillary canine Labial Aspect The essential differences between mandibular and maxillary canines viewed from the labial aspect are as follows: MAXILLARY CANINE MANDIBULAR CANINE Crown wider mesiodistally Crown narrower mesiodistally Cusp angle is sharper, more acute Cusp angle more blunt Mesial cusp ridge is shorter than distal Mesial cusp ridge much shorter than distal Mesial, distal proximal contacts more cervical Mesial cusp ridge almost horizontal Mesial of crown bulges beyond root outline Mesial, distal proximal contacts more incisal More pronounced labial ridge Mesial crown outline almost continuous with More pointed root tip root with little or no bulge. Less pronounced labial ridge More blunt root tip Lingual Aspect In comparing the lingual aspect of the mandibular canine with that of the maxillary canine, the following differences are noted: MAXILLARY CANINE MANDIBULAR CANINE More prominent anatomy on lingual: Smoother lingual surface: Lingual marginal ridges pronounced Lingual marginal ridges less pronounced Prominent lingual ridge and fossae Less prominent lingual ridge and fossae Cingulum centered Cingulum centered or to distal Mesial Aspect: The mandibular canine has less curvature labially on the crown, with very little curvature directly above the cervical line. the curvature at the cervical portion is less than 0.5 mm. The lingual outline of the crown is curved in the same manner as that of the maxillary canine, but it differs in degree The cingulum is not as pronounced, and the incisal portion of the crown is thinner labiolingually, which allows the cusp to appear more pointed and the cusp ridge to appear more slender. The tip of the cusp is more nearly centered over the root. The cervical line curves more toward the incisal portion than does the cervical line on the maxillary canine. The roots of the two teeth are quite similar from the mesial aspect, except for a more pointed root tip on the mandibular canine. The developmental depression mesially on the root of the mandibular canine is more pronounced and sometimes quite deep. Distal Aspect Little difference from the distal aspect can be seen between mandibular and maxillary canines except for those features mentioned under the mesial aspect that are common to both. Incisal Aspect The outlines of the crowns of mandibular and maxillary canines from the incisal aspect are often similar. The main differences to be noted are as follows: 1. The mesiodistal dimension of the mandibular canine is less than the labiolingual dimension. A similarity is evident in this, but the outlines of the mesial surface are less curved. 2. The cusp tip and mesial cusp ridge are more likely to be inclined in a lingual direction in the mandibular canine, with the distal cusp ridge and the contact area extension distinctly so. 3. Note that the cusp ridges of the maxillary canine with the contact area extensions are more nearly in a straight line mesiodistally from the incisal aspect.