Questions and Answers
What is the characteristic of the lingual surface of the mandibular canine crown?
It is flat, smoother and regular
What is the location of the cingulum in the mandibular canine?
It is shifted distally
What is the shape of the incisal surface of the mandibular canine?
It is less curved than the maxillary canine
What is the characteristic of the root of the mandibular canine?
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What is the orientation of the mesial cusp ridge and the contact area in the mandibular canine?
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What is the characteristic of the developmental depression on the root of the mandibular canine?
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What is the width of the lingual portion of the root of the mandibular canine in comparison to the labial portion?
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What is the characteristic of the distal contact area of the mandibular canine?
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What is the shape of the labial outline of the mandibular canine crown?
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What is the characteristic of the lingual outline of the mandibular canine crown?
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Study Notes
Human Dentition
- Human teeth are equally arranged into four quadrants: upper right, upper left, lower right, and lower left.
- Each quadrant has a specific arrangement of teeth: incisors, canines, premolars, and molars.
Tooth Morphology
- Incisors:
- Have a trapezoidal shape with the longer parallel side at the incisal edge and the shorter side at the cementoenamel junction.
- Labial and lingual crest of curvatures are at the cervical third of the crown.
- Newly erupted incisors have rounded portions on the incisal ridge called "Mamelons".
- Canines:
- Have a cone or wedge shape, suitable for piercing, cutting, and tearing.
- Are designed to function as holding or grasping teeth.
- Premolars (Bicuspids):
- Have a wider surface with multiple projections (cusps), suitable for grinding food.
- The fourth tooth from the midline is the First Premolar, and the fifth tooth is the Second Premolar.
- Molars:
- Have a wide surface with multiple projections (cusps), suitable for grinding food.
- Are characterized by having multiple cusps.
Tooth Development
- Developmental Lobes:
- Are the first growth centers of the tooth, which fuse to form the tooth.
- Each tooth begins its development from four or more growth centers.
- Developmental Grooves:
- Are the lines that mark the fusion of the developmental lobes.
- Can be seen on the tooth after its eruption but soon disappear due to wear and attrition.
Tooth Structure
- Pulp Chamber:
- Is wider from the mesio-distal section, confirming the shape of the crown.
- Tapers from the incisal part, but is wider at the cervix.
- Has three pulp horns corresponding to the three mamelons.
- Root Canal:
- Tapers towards the apex.
- Has a roughly triangular shape in young teeth, becoming rounded or crescent-shaped in old teeth.
- Cervical Line:
- Is less curved than that of the central incisor.
- Is perfectly centered.
Other Terms
- Inclined Planes:
- Are slopes from cusp tips to the developmental grooves.
- Height of Contour:
- Is the point of maximum convexity of the tooth surface.
- Pits:
- Are small pinpoint depressions located at the junction of developmental grooves and/or at their terminals.
