Permanent Maxillary and Mandibular Canines

Learning Out Come (LO 1) Permanent Maxillary and Mandibular Canines The student should be able to: ❖Distinguish the chronological and morphological details of the permanent maxillary and mandibular Canines ❖Distinguish the characteristic features from different aspects of the teeth (Labial, L...

Learning Out Come (LO 1) Permanent Maxillary and Mandibular Canines The student should be able to: ❖Distinguish the chronological and morphological details of the permanent maxillary and mandibular Canines ❖Distinguish the characteristic features from different aspects of the teeth (Labial, Lingual, Mesial, Distal & Incisal). ❖Identify & differentiate maxillary from the permanent mandibular Canines ❖Distinguish a few common variations in tooth morphology. Maxillary Permanent Canine Crown: La Smooth, convex with shallow depressions Labial mesially and distally ridge The medial lobe is well Mesial developed forming a slope labial ridge extending Distal from the cusp tip to the slope cervix Maxillary Permanent Canine Mesial cusp slope is shorter La than the distal cusp The distal outline is slightly Labial concave but the mesial is ridge convex Mesial Root: slope One, cone shaped and smooth Labially, slender in shape Distal when compared with the bulk slope of the crown Blunt apex, apical third may show sharp curve toward distal  Cont’d Lingual aspect: Li The crown and the root are narrower lingually (converge) The cingulum is large and situated in the cervical 1/3 The cingulum may be exhibited as pointed cusp Mesial Lingual Distal fossa ridge fossa  Cont’d Occasionally, a well- Li developed lingual ridge is seen, which is confluent with the cusp tip Mesial and distal lingual fossae sometimes are evident Mesial Lingual Distal fossa ridge fossa  Cont’d Proximal surfaces: D M The root is broad for 2/3 of its length, tapering at the apical 1/3 Deep depressions on the mesial and distal surfaces of the root; the distal is more prominent The cervical lines curve toward the cusp; more on the mesial Depressions Cervical lines Clinical considerations with maxillary canines  The maxillary canines may erupt labially or lingually in relation to the surrounding teeth  The maxillary canines may also fail to erupt fully and may remain impacted.  This occurs because the permanent maxillary canines erupt after the maxillary incisors and possibly after the premolars and their arch space has closed. Type of maxillary Canine impactions  9-11 years Ugly Duckling Stage Transitional mal-alignment of anterior teeth corrected by eruption of canines Mandibular Canine Li La ▪ The mandibular canine usually erupt before the maxillary canines and after most of the incisors have erupted. ▪ A mandibular canine closely resembles a maxillary canine. M D ▪ Although the entire tooth is usually as long as maxillary canine, a mandibular canine is narrower labiolingually and mesiodistally than a maxillary canine. Mandibular Canine Li La ▪ The lingual surface of the crown of the mandibular canines is smoother than that of the maxillary canines and has a less M D developed cingulum and two marginal ridges.  Cont’d ▪ With variation, the mandibular La Li canine might have two roots and thus two root canal ▪ The mesial cusp slope is shorter than the distal cusp slope ▪ The mesial outline is slightly convex M D ▪ The distal outline is slightly concave from cervix to the contact area ▪ The middle lobe is well-developed (labial ridge) with two depressions on either side of the ridge  Cont’d ▪ The cusp tip is centered over the root La Li ▪ The crown and the root converge lingually ▪ A prominent lingual ridge with two fossae on either side of the ridge ▪ Pronounced cingulum and marginal ridges M D ▪ The cervical lines curve toward the incisal ▪ Deep depression in the root surface ▪ The contact area is at the junction of the incisal 1/3 Anomalies Chapter 8 Wheelers Dental Anatomy