Maxillary Canine Lecture 5 PDF - MNU Dentistry

FACULTY OF DENTISTRY ORAL BIOLOGY DEPARTMENT Prepared By: Dr. Saher Mohammed Assistant Professor of Oral Biology Presented & Edited By: Dr. Mary Moheb Ramzy Lecturer of Oral Biology  Recognize its Functions and chronology  Enumerate...

FACULTY OF DENTISTRY ORAL BIOLOGY DEPARTMENT Prepared By: Dr. Saher Mohammed Assistant Professor of Oral Biology Presented & Edited By: Dr. Mary Moheb Ramzy Lecturer of Oral Biology  Recognize its Functions and chronology  Enumerate the number of lobes  Describe geometric outline of the crown and root.  Describe surface anatomy of the crown and root.  Describe morphology of pulp cavity.  Permanent maxillary canine Wedge in shape The longest tooth in the mouth FUNCTION: cutting & tearing  Permanent maxillary canine Canine = Cuspid = Eye tooth Canine eminence= a prominence on the surface of the superior maxillary bone caused by the socket of the canine tooth  Chronology: 1. Enamel organ appearance 6 m.i.u 2. Beginning of calcification 4-5 m. 3. Crown completed 6-7 years 4. Eruption 11-12 years 5. Root Completion 13-15 years 4 lobes Labial and lingual aspects have trapezoid outline.  Outlines of crown labial aspect Convex mesial outline Concave mesial cusp slope Concave distal outline Convex distal cusp slope D M Mesial cusp slope is shorter than distal cusp slope MCA at the junction of incisal and middle thirds while DCA in the middle third Cusp tip is slightly mesial to the midline  Root outline and surface anatomy Root outlines (mesial and distal outlines) taper to a blunt pointed apex The apical third of the root is tilted D M distally Root is convex from labial and lingual aspects  Labial aspect Elevations: Cervical ridge in cervical third Prominent labial ridge Depressions: Mesiolabial and distolabial depressions  Surface anatomy of lingual aspect Elevations: Prominent mesial and distal marginal ridges Prominent lingual ridge Cingulum Cusp ridge (cusp slopes) Shallow Depressions: mesiolingual & distolingual fossa  Geometric outline of the crown Proximal aspects Triangular or wedge in shape With bulky appearance  Labial outline: convex with maximum convexity at cervical third (height of contour) Lingual outline: convex in incisal third straight at the middle third Convex in cervical third (bulky cingulum) Height of contour Cervical outline: Curves incisally. The incisal edge is located The root labial and lingual labial to the long axis of the tooth outlines taper to blunt pointed (crown is tilted labially) apex  Differences between mesial and distal aspects cervical line is curved incisally to lesser extent in distal aspect than mesial one. MCA at the junction of incisal and middle thirds & DCA is in the middle third The developmental depression on the distal aspect of root is more distinct Shallow concavity cervical to CA distally  Diamond geometric outline  The thickness is greater than breadth (bulky cingulum, labial and lingual ridges)  Crown tapered lingually (lingual convergency) Cusp tip is labial to the center of crown labiolingually and is slight mesial. Incisal aspect surface anatomy Elevations Well developed Mesial and distal marginal ridges Prominent lingual ridge Bulky cingulum Labial ridge Cusp Depressions Shallow mesiolingual and distolingual fossae