Lecture 5a. Maxillary Canines (3) PDF

MAXILLARY PERMANENT CANINES Dr. Aaron S. Anyetei-Anum 30th September, 2020 CONTENT Overview Labial Aspect Lingual Aspect Mesial Aspect Distal Aspect Incisal Aspect Pulp Cavity OVERVIEW Together with the mandibular canines, they are the longest teeth in the mouth Located at the corn...

MAXILLARY PERMANENT CANINES Dr. Aaron S. Anyetei-Anum 30th September, 2020 CONTENT Overview Labial Aspect Lingual Aspect Mesial Aspect Distal Aspect Incisal Aspect Pulp Cavity OVERVIEW Together with the mandibular canines, they are the longest teeth in the mouth Located at the corners of the mouth Well anchored in the bone by their extremely long roots Their location requires extra anchorage which is furnished by the length and shape of their OVERVIEW They function as holding and tearing tools and assist the incisors and premolars They are the most stable teeth in the mouth Their V-shape at the corner of the mouth allows for dissipation of pressures that can otherwise force the premolars to protrude out of the mouth or the incisors OVERVIEW Evidence of Calcification : 4 months Enamel Completed : 6 – 7 years Eruption : 11 – 12 years Root Completed : 13 – 15 years Facial and lingual heights of contour : Cervical third, 0.5mm A maxillary canine resembles an incisor in comparison to its four developmental lobes (3 facial and 1 lingual) LABIAL ASPECT The crown and root are narrower mesiodistally than those of a maxillary central incisor Have the longest root length of all the anterior teeth, thus making them the longest teeth in the mouth The cervico-incisal length is long (10mm), coming next to the maxillary central incisors (10.5mm) and mandibular canines (11mm) Labial Surface LABIAL ASPECT Has a shorter mesial incisal slope than distal Disto-incisal angle is more rounded than the mesio-incisal Smooth labial surface The cervical line crests slightly mesial to the center of the tooth LABIAL ASPECT There are two shallow depressions (developmental lines) dividing the three developmental lobes on the crown. The middle lobe is much larger and extends incisally to form the single cusp The cusp tip is centered in the middle of the tooth LABIAL ASPECT The root is slender in comparison to the crown and is conical in shape with a blunt apex It is not unusual for the root to turn sharply to the distal or mesial side in the apical third. A general rule is that, most roots, if they do have an apical curvature, turn toward the distal side Labial Surface LINGUAL ASPECT Both the crown and root taper towards the lingual side The cervical line shows a more even and straighter curvature, centered over the middle of the tooth Has a well developed cingulum Confluent to the cingulum and running from the cusp tip is a well developed lingual ridge Lingual Surface Lingual Surface LINGUAL ASPECT The lingual ridge divides the lingual fossa into mesial lingual fossa and distal lingual fossa These fossae are bordered by a mesial or distal marginal ridge, the lingual ridge and the incisal ridge The tooth is much wider labio- lingually (8mm) than a maxillary central incisor (7mm) due to the MESIAL ASPECT The functional form of the tooth is evident from this view The crown is wedge shaped with the tip of the cusp labial to the midline Mesially, the outline of the crown is straighter than laterally, with a slight convexity at the contact area The center of the contact area is approximately at the junction of the incisal and middle thirds of the crown Mesial Surface MESIAL ASPECT The tooth has the greatest labio- lingual dimension (8mm) of all anterior teeth, with the greatest measurement at the cervical third i.e. cingulum The entire labial surface is more convex from the cervical line to the cusp tip than any other maxillary anterior tooth The cervical line curves towards MESIAL ASPECT The mesial surface of a canine is entirely convex throughout except for a small area between the contact area and the cervical line, which may be flat The root is broad labio-lingually and is extremely long with a blunt apex A shallow developmental depression extends from the cervical line halfway to the apex of the root, for anchorage and to prevent root rotation DISTAL ASPECT The outline of the crown is rounded in appearance Contact area is usually at the center of the middle third of the crown This makes the convexity appear larger and more uniform The cervical line curves towards the cusp an average of 1.5mm Distal Surface DISTAL ASPECT The distal marginal ridge is more developed and heavier in outline than the mesial marginal ridge Displays more concavity above the contact area Root surface may show a more pronounced developmental depression than the mesial side INCISAL ASPECT The cusp tip is formed by the junction of four ridges (centro-facial developmental lobe, lingual ridge, mesio-incisal and disto-incisal edges) The cusp tip is labial to the center of the crown labio-lingually and mesial to the center mesiodistally Wide mesio-distally Has the thickest labio-lingual measurement of any anterior tooth Incisal Aspect Incisal Aspect INCISAL ASPECT The distal aspect appears thinner than the mesial apsect Summary of Surfaces Summary of Surfaces PULP CAVITY Has a large pulp chamber and a single pulp horn is present which extends towards the cusp tip.  The single root canal is usually straight but can be tortuous when the root is curved Pulp Cavity THANK YOU