Mandibular canine

Mandibular Canine - Primary & Permanent
Dr.Nagarathinam

1. MANDIBULAR CANINE - Primary and Permanent Dr Nagarathinam AE Department of Oral Pathology SRM DENTAL COLLEGE,Ramapuram , Chennai

2. Nomenclature Deciduous Mandibular Canine Permanent Mandibular Canine Universal system R M 27 22 Zsigmondy/Palmer C C 3 3 FDI 83 73 43 33

3. Permanent Mandibular Canine Similar to maxillary canine. Narrower Mesiodistally and labiolingually . Crown length longer.

4. Measurement Table Cervicoincisal Length of Crown Length of Root Mesiodistal Mesiodistal Diameter of Diameter Crown at of Crown Cervix Labio- or Buccolingual Diameter of Crown Labio- or Buccolingual Diameter of Crown at Cervix Curvature of Cervical Line—Mesial Curvature of Cervical Line—Distal Dimensions 11.0 16.0 7.0 , 5.5 7.5 7.0 2.5 1.0 First evidence of calcification 4-5 mo Enamel completed 6-7 yr Eruption 9-10 yr Root completed 12-14 yr

5. LABIAL ASPECT SHAPE – TRAPEZOIDAL MESIAL OUTLINE - Straight MESIAL SLOPE DISTAL SLOPE CONTACT AREA – Towards incisal edge Cervical line – Semicircular – Towards apex CONTACT AREA – Junction of middle third and incisal third Convex TRAPEZOIDAL

6. Cone shaped Narrower than Maxillary Canine Mesial Outline Distal Outline

7. Labial Aspect From the labial aspect - Mesiodistal dimensions of the mandibular canine are less than those of the maxillary canine. The mandibular canine is broader mesiodistally than either of the mandibular incisors The essential differences between mandibular and maxillary canines viewed from the labial aspect may be described as follows: The crowns of the mandibular  canines appear longer. Sometimes they are longer, but the effect of greater length is emphasized by the narrowness of the crown mesiodistally and the height of the contact areas above the cervix. The mesial outline  of the crown of the mandibular canine is nearly straight with the mesial outline of the root, with the mesial contact area being near the mesioincisal angle. When the cusp ridges  have not been affected by wear, the cusp angle is on a line with the center of the root, as on the maxillary canine. The mesial cusp ridge is shorter . The distal contact area of  the mandibular canine is more toward the incisal aspect than that of the maxillary canine but is not up to the level of the mesial area.

8. LINGUAL ASPECT TRAPEZOIDAL Mesial Ridge Distal Ridge Mesial Marginal Ridge Distal Marginal Ridge Lingual Ridge Cingulum

9. Vs maxillary canine Lingual surface of the crown  of the mandibular canine is flatter, simulating the lingual surfaces of mandibular incisors The cingulum is smooth and poorly developed. The marginal ridges are less distinct. lingual surface of the crown is smooth and regular. The lingual portion of the root is narrower relatively  than that of the maxillary canine.

10. MESIAL ASPECT Shape Outline Taper Contact area

11. mandibular canine has less curvature labially on the crown 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. Tip of the cusp is more nearly centered over the root, with a lingual placement in some cases comparable to the placement of incisal ridges on mandibular incisors. 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 with the possible exception of 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

12. Distal Aspect `

13. IINCISAL ASPECT OVOID ASYMMETRY The outlines of the crowns of  mandibular and maxillary canines from the incisal aspect are often similar, • 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. • 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.

14. Deciduous Canine First Evidence of calcification Crown Completion Eruption Root Completion Shedding 17 Weeks in utero 9 months 20 (17-23 months ) 3 ¼ years 9 Years Total Length Cervicoincisal Length of crown Cervico apical Length of root Mesiodistal diameter of crown Mesiodistal diameter of crown at the cervix Labiopalatal Diameter of crown Labiopalatal diameter of crown at cervix 17.5mm 6mm 11.5mm 5.0mm 3.7mm 4.8mm 4.0mm

15. Similar to maxillary canine Except that this is Shorter in crown dimension Shorter in root dimension Greater in MesioDistal at contact area Greater in Mesiodistal at cervix Shorter in labiolingual dimension Shape of crown – Angular or diamond shaped Compared with a maxillary canine, the labial surface of a mandibular canine is much flatter, with shallow developmental grooves.

16. The outline form of a mandibular canine resembles an incisor, with the incisal ridge centered over the crown labiolingually . The labiolingual measurements are smaller than are those of a maxillary canine

17. Incisal ridge is straight and centers over the crown labiolingually . The lingual surface shows a definite tapering toward the cingulum. The labial surface from this aspect presents a flat surface with a slight convexity, whereas the lingual surface presents a flattened surface that is slightly concave.

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