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Peramanent Maxillary Canine
- 1. Maxillary Canine DR MONIKANEGI MDS ORAL PATHOLOGY ,MICROBIOLOGY AND FORENSIC ODONTOLOGY
- 2. CONTENTS • Introduction. • Chronology. • Average Dimension. • Labial Aspect. • Lingual Aspect. • Mesial Aspect. • Distal Aspect. • Incisal Aspect
- 3. INTRODUCTION • Caninesare very long and stable teeth. • Develops from 4 lobes, 3 labial and 1 lingual. • Middle labial lobe developes into a cusp.
- 4. There are4 canines (2 Maxillary & 2 Mandibular) placed at corner of mouth & hence called ‘corner tooth ’ of the dentition. • Single pointed cusp present so also called cuspids. • The canine's role in mastication is mainly tearing, which is intermediate between incising of anterior teeth & grinding of the posterior teeth
- 5. • Canineeminence- bony ridge over the labial surface of roots, has a cosmetic value helps form a foundation that ensures normal facial expression at the corners of the mouth. • Arch position - The permanent maxillary canine replaces deciduous maxillary canine & is located 3rd from midline in each maxillary quadrant. • Mesial contact : Maxillary lateral incisor • Distal contact : Maxillary first premolar.
- 6. CHRONOLOGY • Firstevidence of calcification : 4-5 mo • Enamel completed : 6-7 yr • Eruption : 11-12yr • Root completed : 13-15y
- 8. LABIAL ASPECT Thecrown of maxillary canine is narrower mesiodistally than that of maxillary central incisor. • It has two slopes (cusp ridges), the mesial slope being shorter than the distal slope. • The labial surface is smooth and bulky in the middle because of the labial ridge.
- 9. • Imbricationlines can often be found in cervical 3rd of the facial surface : “Lines of Pickerell”. • Mesial outline : usually convex from the cervix to the center of the mesial contact area or the crown may exhibit a slight concavity above the contact area . • Rounded mesioincisal angle.
- 10. • Heightof contour (mesial margin) : at contact area (junction of incisal & middle thirds). • Distal Outline: usually concave between CEJ and DCA. • Distal margin : Shorter than the mesial margin & also has a more rounded incisal angle
- 11. • Heightof contour : at contact area (middle 3rd) • Cusp tip is in line with the center of the root. • Cusp slopes shows tendency toward concavity(notch) before wear has taken. • Labial surface is convex in all directions, but curvature is more pronounced mesiodistally. • General outline of the surface is pentagonal.
- 12. • Incisalaspect has a large cusp with a pointed cusp tip. • Incisal margin - divided into two components by tip of cusp & are termed the mesioincisal and distoincisal slopes (or mesial & distal cusp ridges). • Root appears slender, conical in form with a blunt apex, root may curve mesially or distally. Labial aspect Labial ridge Cusp tip Distal cusp ridge Mesial Cusp Ridge
- 13. LINGUAL ASPECT •Crown and root are narrower lingually. • Cingulum is well developed, large & sometimes pointed like a cusp. • Cervical line curves asymmetrically toward the apex with a slight offset to the distal.
- 14. • Stronglydeveloped marginal ridges, occasionally a well- developed lingual rigde at the center with two shallow concavities namely; Mesial and Distal lingual fossa. • Root narrower than labial, mesial and distal surface of root is visible lingually. • Developmental depressions M and D may be seen.
- 16. MESIAL ASPECT •From the mesial aspect canine looks similar but bulkier than maxillary central incisor. • Maxillary canine is the widest anterior tooth labio lingually. • The outline of the crown is wedge shaped , the greatest measurement being at the cervical 3rd. • Wedge point being represent by the tip of the cusp.
- 17. Below thecervical 3rd of the crown , the labial face may be presented by a line only slightly convex from the crest of curvature at the cervical third to the tip of the cusp. • Labial outline exhibits more convexity. • The lingual outline of the crown may represented by a convex line describing the cingulum , which convexity straightens out as the middle 3rd is reached , becoming convex again in the incisal 3rd.
- 18. CEJ curvesapproximately 2.5 mm incisally . • The contact area is near the junction of the incisal and middle third. • Root outline is conical, tapered or blunt pointed apex, may curve labially
- 19. Labial outlineof root maybe almost perpendicular . • Mesial surface of root appears broad with shallow developmental depression that help to anchor the teeth in the alveoli and help prevent rotation and displacement. • A line bisecting the cusp is labial to a line bisecting the root.
- 20. DISTAL ASPECT •Same as mesial except the following: a. Less curvature of CEJ (approx. 1 mm) . b. Contact area is broader . c. Distal marginal ridge is heavier . d. More irregular in outline. e. More concave surface. f. More pronounced root developmental depression.
- 21. INCISAL ASPECT •The labiolingual dimension is greater than the mesiodistal dimension • Maxillary canine is generally convex in both its labial and lingual outlines • The cusp tip is labial to the centre of the crown labiolingually and mesial to the centre mesiodistally • The labial ridge and the cingulum are very noticeable from this aspect Incisal aspect
- 22. When cutcross-sectionally, mesial section, shows greater labiolingual bulk, crown gives impression of having all the distal portion stretched to contact first premolar. • Line bisecting cusp and cusps ridges in the MD direction is almost always straight . • Distal slope is longer than mesial slope
- 23. MLF, mesiolingualfossa; MCR, mesial cusp ridge; DCR, distal cusp ridge; DLF, distolingual fossa; C, cingulum
- 24. ROOT • Onlyone • Longest and strongest of all the teeth in the mouth • Mesial & distal surfaces of root have developmental depressions • From all aspects, the root tapers gradually to a sharp, or slightly blunted apex • Wider labiolingually than mesiodistally • Lingual and labial surfaces are convex
- 25. REFERENCES • WHEELER’Sdental anatomy, physiology , and occlusion 8th edition .