canines

Anterior tooth , canines , dental anatomy , free dental slide showe

1. Canines DR : Abdelrhman Alaa Nosair

2. Canines Upper & Lower

3. Functions Mastication (tearing ), Esthetic Speaking Growth of the jaws.

4. Root completed Eruption Crown completed Beginning of calc. (month) 3 3 - 3 years 9 4-5m + 3 years 11

5. Note: the middle lobe of the canine is well developed Incisally cusp Labially Labial ridge. Lingually Lingual ridge. Number of lobes (four lobes 3 labially and 1 lingually).

6. For easy teeth description We have to speak about : Geometric outline of the crown. Outlines of the crown and root. Surface anatomy of the crown and root (anatomical landmarks). Convex Concave

7. Labial Lingual Mesial Distal Incisal Upper canine has 5 aspects:

8. Labial Lingual Mesial Distal Incisal Lower canine has 5 aspects:

9. Geometric outline of the crown Facial and lingual aspects have trapezoid out line. Smallest uneven side cervically.

10. Facial and Lingual Outlines of 3 It’s Trapezoid and formed of Mesial outline : , convex till the contact area (at the junction of I 1/3 and M 1/3) then continues as concave till the cusp tip. Distal outline: concave till the contact area (at the middle third) then continues as convex till the cusp tip. Cervical outline : convex root wise.

11. Upper 3 & Lower 3 The crown is - short -wide -thick The crown is - longer -narrower -thinner * Mesially and distally the crown bulge beyond the root outline The cusp tip is long and pointed Mesially the crown is at one line with root outline *Distally the crown bulge beyond the root outline The cusp tip is shorter and flatter ( less pointed) (D slope >M slope) So their cusp tips is slightly mesial to the center of crown

12. Upper 3 & Lower 3 MCA----- at the junction of incisal and middle 1/3s DCA----- in the center of middle 1/3 So the contact areas are located more cervically MCA---- in incisal1/3 near the mesio-incisal angle DCA----- at the junction of incisal and middle 1/3s So the contact areas are located more incisally M M D D

13. It’s convex with maximum convixity at the cervical ridge . The labial ridge is prominent in upper 3 Elevations: Labial ridge IT is a prominent ridge runs from the tip of the cusp toward the cervical margin Labial aspect The labial ridge is less prominent in lower 3

14. Upper 3 & Lower 3 The root is - long -slender -conical The root apex is pointed and curved distally The root is the same but shorter The root apex is more pointed and curved distally

15. Lingual aspect Elevations : Marginal ridges, cingulum, cingulum Prominent lingual ridge that extend from the cusp tip till the cingulum in 3 while in 3 it’s restricted to the incisal third. Depressions: Lingual fossa that is divided into two fossae in 3 but still one in 3. 3 3

16. Note: The elevations of the lower canine are not well developed as in case of the upper. The lingual surfaces in both are smaller in size than the labial surface due to the lingual convergence which accommodate ……….

17. Apex of the triangle incisally. Note: the cusp tip of 3 centralized on the long axis or inclined labially . while the 3 cusp tip centralized or inclined lingually . Proximal aspects have triangular outline Geometric outline of the crown The base cervically. Apex of the triangle incisally.

18. Mesial and distal Outlines of the crown Labial outline is convex with the crest of curvature at the cervical third represent…… Lingual outline is convex cervically represent... In the incisal third it’s convex again represent …… In the middle it’s straight due to presence of ridge ……..

19. Notes: Lingual outline in the middle of 3 is concave rather than straight due to short lingual ridge. Cervical outline: curved incisally however, this curvature is less on the distal than the mesial.

20. The root surface is broad with longitudinal depression. The depression is shallower mesially than distally of same tooth and is shallower in upper canine than lower canine.

21. Note: the depression in lower canine may be so deep causing bifurcation in the root. The bifurcation may be apically or extend up to cervical third. If two roots exist they will be divided labially and lingually. labial lingual

22. Cingulum. Mesial marginal ridge. Distal marginal ridge M.L.F D.L.F M.I.Ridge D.I.Ridge Lingual ridge Enumerate the names of the following elevations and depressions?

23. Upper 3 & Lower 3 Geometric outline--- Diamond (Lab-Ling > M-D ) The cusp tip is located mesio-labially The cusp tip is located mesio-lingually

24. Incisal aspect. Outline and surface anatomy The thickness is greater than the width. ( Diamond) The elevations and depressions in the labial and lingual surfaces appeared in this aspect 3 3

25. Pulp cavity. Pulp cavity is formed of: Pulp chamber that present in the crown. Its outline follows the outline of the crown. In young teeth, it has pulp horn related to the cusp Root canal presents in the root and follows its outline. The number of root canals in canines is only one. Sometimes 3 has two root canals labially and lingually. The canals open in one apical foramen or separate foramina.

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