Morphology of Teeth Flashcards
I. Basics
1. What is Anatomical crown?
The part of the tooth covered by enamel
I. Basics
2. What is Clinical crown?
The part of the tooth visible in the oral cavity
I. Basics
3. What is Anatomical root?
The part of the tooth covered by cementum
I. Basics
4. What is Clinical root?
The part of the tooth lies within the alveolus
I. Basics
5. What is Cementoenamel junction (CEJ)?
The part of the tooth where 2 vital protecting substances (enamel +cementum) meet
II. Numbers & Orientations of teeth
1A. What is the number of teeth in adults?
32
II. Numbers & Orientations of teeth
1B. In each quadrant, how many teeth are present in adults? What are they?
In each quadrant 8 teeth are present:
1 Central Incisor
1 Lateral Incisor
1 Canine
2 Premolars (bicuspid)
3 Molars (last molar named as Wisdom)
II. Numbers & Orientations of teeth
2A. What is the number of teeth in children?
20
II. Numbers & Orientations of teeth
2B. In each quadrant, how many teeth are present in adults? What are they?
In each quadrant 5 teeth are present:
1 Central Incisor
1 Lateral Incisor
1 Canine
2 Molars
NO PREMOLARS
III. Morphology of teeth
1. Describe Maxillary first (central) permanent incisor
Crown:
The shape is similar to the shovel or chisel
Cervical section:
Circular (also triangular) shape
Root:
1 root – 1 rootcanal
III. Morphology of teeth
2. Describe Maxillary second (lateral) permanent incisor
- Crown:
It is smaller, but similar to the first incisor. Note: The mesial angle is rounded. - Cervical section:
Flattened in mesiodistal direction (or can be circular shaped). - Foramen coecum is on the palatal
- 1 root – 1 rootcanal
III. Morphology of teeth
3. Describe Maxillary permanent canine
- Crown:
- Wedge shaped
- The edges beginning from tip of the cusp divides the vestibular coronal surface into two parts:
+) 1/3 — smaller part
+) 2/3 — bigger part - Cervical section:
- Rounded equilateral - Root:
- 1 root – 1 rootcanal
- It has the longest and strong root (20-22 mm) among the teeth
III. Morphology of teeth
4. Describe Mandibular first (central) permanent incisor
- Crown:
- Chisel shaped
- Smallest tooth of the oral cavity! - Cervical section: Elliptic
- Root: 1 root – 1 rootcanal (1/4 contain 2 root canals)
III. Morphology of teeth
5. Describe Mandibular second (lateral) permanent incisor
- Crown: Chisel shaped & bit bigger then the 1st lower incisor.
- Cervical section: Rectangular with rounded angles
- Root: 1 root – 1 rootcanal
III. Morphology of teeth
6. Describe Mandibular permanent canine
- Crown:
- It is similar to the upper canine, but smaller and rounded shaped. - Cervical section: Ellipsoid shaped
- Root: 1 root – 1 root canal
-> It has the second longest root among the teeth!
III. Morphology of teeth
7. Describe Maxillary first premolar (bicuspid)
- Crown:
- 2 cups: 1 buccal - 1 palatal
- Mesial surface is concave! - Cervical section: Finger biscuit
- Root:
- 2 roots – 2 canals:1 buccal, 1 palatal
III. Morphology of teeth
8. Describe Maxillary second premolar (bicuspid)
- Crown:
- It is smaller, and similar to the first premolar
- The cusps are totally the same. - Cervical section: Irregularly flattened
- Root:
1 root – 1 root canal
(Rarely it has 2 canals or 2 roots!)
III. Morphology of teeth
9. Describe Mandibular first premolar (bicuspid)
- Crown:
- 2 cusps – 1 buccal, 1 lingual
- Buccal cusp bigger than the lingual cusp.
- The occlusal surface diverges to the lingual surface - Cervical section: Irregular flattened shape (in mesiodistal direction)
- Root: 1 root - 1 canal
III. Morphology of teeth
10. Describe Mandibular second premolar (bicuspid)
- Crown:
- It is bigger than the lower first premolar.
- It may have 2 or 3 cusps: 1 buccal cusp - 1 or 2 lingual cusps - Root:
1 root – 1 canal
III. Morphology of teeth
11A. Describe the crown of Maxillary first molar
A. 4 cusps
- MB (mesiobuccal)
- DB (distobuccal)
- MP (mesiopalatal)
- DP (distopalatal)
B. MP cusp is the biggest, and it has a special cusp: tuberculum animal carabelli
C. Between MP - DB cusps, there is a protection named as crista transversa
D. DP is the smallest
E. There is foramen coecum on the palatal surface of the tooth
III. Morphology of teeth
11B. Describe the root of Maxillary first molar
3 roots – 3 or 4 canals
MB – 1 or 2 canals
DB - 1 canal - it is the weakest root!
P - 1 canal – it is the biggest root!
III. Morphology of teeth
12. Describe the Maxillary second molar
- Crown: It is smaller than the first molar & the shape is variable.
- Root:
- 3 root – 3 rootcanal
- MB
- DB
- P
III. Morphology of teeth
13. Describe the Maxillary third molar
- Crown: The shape is variable! 2-6 cusps!
- Root: Number & form of roots are variable too!
III. Morphology of teeth
14A. Describe the crown of mandibular first molar
A. 5 cusps:
MB (mesiobuccal)
DB (distobuccal)
D (distal)
ML (mesiolingual)
DL (distolingual)
B. MB cusp is the largest!
DB cusp is the smallest!
C. Among the cups there are fissures
D. There is foramen coecum on the buccal surface
III. Morphology of teeth
14B. Describe the root of mandibular first molar
2 roots - Mesial & distal roots
M root – 2 canals: MB, ML canals
D root – 1 canal
III. Morphology of teeth
15. Describe Mandibular second molar
- Crown:
- 4 cusps: MB, DB, ML, DL
- There are 2 fissures, they are perpendicular to each other.
- There is foramen coecum is on the buccal surface. - Root:
- 2 roots: Mesial & Distal roots
- M root – 1 or 2 canal(s)
- D root – 1 canal
III. Morphology of teeth
16. Describe Mandibular third molar
- Crown:
- Smaller than the lower second molar.
- Sometimes it has 4 or 5-6 cusps. - Root:
- Usually it has 2 roots: Mesial & Distal roots, or sometimes it can have 1-4 roots!
