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Tooth Histology and Morphology. Oral Anatomy, DA102. Succedaneous Teeth. Refer to a permanent tooth that replaces, or succeeds a deciduous tooth in the same position . Succedaneous Teeth. Surface shapes of the facial and lingual. Cusps. Pointed or rounded mound on

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Tooth histology and morphology

Tooth Histology and Morphology

Oral Anatomy, DA102


Succedaneous teeth
Succedaneous Teeth

Refer to a permanent tooth that replaces, or succeeds a deciduous tooth in the same position.




Cusps
Cusps

  • Pointed or rounded mound on

    the crown of the tooth

  • Referred to by their position on the

    tooth

    Examples:

    distal cusp

    mesial cusp

    distal buccal cusp



Pits:

Small depressions in

surfaces of teeth


Lobes
Lobes

  • Separate parts that come together to form a tooth.

  • In a molar, the lobes often becomes cusps

  • On lingual surface of maxillary

    anteriors, lobes are called

    cingulums


Grooves
Grooves

  • Lineal depressions running

    between cusps; give

    distinct character to teeth

  • Fissures: developmental grooves

    between lobes


Furcations
Furcations

Dividing point of a multi-rooted tooth

Two roots = bifurcated

Three roots = trifurcated


Contacts and embrasures
Contacts and Embrasures

Contact: where proximal surfaces of teeth come together and touch

Embrasure: triangular space in the gingival direction where two adjacent teeth are in contact


Fossa
Fossa

Shallow rounded or angular depression


Mamelons
Mamelons

Three bulges on the incisal edge of newly erupted central incisor. They normally disappear from normal wear.

newly erupted teeth


Permanent teeth refer to delmar text for illustrations
Permanent Teethrefer to Delmar text for illustrations

  • Maxillary

    • Anteriors Centrals, Laterals, Canines

      • 5 surfaces: labial, lingual, mesial, distal, incisal edge

    • Posterior 1st, 2nd Premolars; 1st, 2nd, 3rd Molars

      • 5 surfaces buccal, lingual, mesial, distal, occlusal

  • Mandibular

    • Anteriors Centrals, Laterals, Canines

      • 5 surfaces: labial, lingual, mesial, distal, incisal edge

    • Posteriors: 1st , 2nd Premolars; 1st, 2nd, 3rd Molars

      • 5 surfaces: buccal, lingual, mesial, distal, occlusal


Maxillary central incisor
Maxillary Central Incisor

Teeth Numbers: #8 and #9

Sharp incisal edge

Largest, widest incisor in mouth

Flat labial surface

Well-developed cingulum with pit

Thumb-nail shape

Mesio-incisal edge = sharp corner

Disto-incisal edge = rounded

Single root Age of eruption: 7 – 8 years


Maxillary central incisor1
Maxillary Central Incisor

Labial Incisal edge Lingual


Maxillary lateral incisor
Maxillary Lateral Incisor

Tooth Numbers: #7 and #10

Similar shape to centrals

Smaller, shorter, narrower, thinner than centrals

More rounded corners on mesio-incisal edge

Smaller cingulum than centrals

Flat labial surface

Definite lingual pit and fossa

Single root Age of eruption: 8 – 9 years


Maxillary lateral incisor1
Maxillary Lateral Incisor

Labial Incisal Edge Lingual


Maxillary canine
Maxillary Canine

Tooth Numbers: #6 and #11

aka “eye-tooth” or cuspid

Longest strongest tooth in human dentition

Defines mouth and face shape (cornerstone of arch)

Incisal edge = rounded and pointed (cusp)

Labial surface has prominent curvature labial ridge

Lingual surface is concave with marginal ridges

Cingulum = bulky

Single root Age of eruption: 11 – 12 years


Maxillary canine1
Maxillary Canine

Labial Incisal Edge Lingual


Maxillary 1 st premolar
Maxillary 1st Premolar

  • Tooth Numbers: #5 and #12

  • 2 cusps: buccal (larger) and lingual

  • aka: bicuspid

  • Usually two roots (can be single-rooted)

    • Buccal and lingual roots

  • Age of eruption: 10 – 11 years


Maxillary 1 st premolar1
Maxillary 1st Premolar


Maxillary 2 nd premolars
Maxillary 2nd Premolars

Tooth numbers: #4 and #13

Smaller and less bulky than 1st premolar

2 cusps = buccal and lingual

Single root

Age of eruption: 10 – 12 years


Maxillary 2 nd premolar
Maxillary 2nd Premolar


Maxillary 1 st molar
Maxillary 1st Molar

  • Tooth Numbers: #3 and #14

  • aka: 6-year molars

  • Trifurcated, wide-spread roots

    • Mesiobuccal, distobuccal, palatal

  • 4 cusps

    • mesiolingual, mesiobuccal, distolingual, distobuccal

    • ML = largest cusp; DL = smallest cusp

    • Sometimes: 5th cusp (cusp of Carabelli) located on mesiolingual surface, about 1/3 way down from occlusal surface

  • Age of eruption: 6 – 7 years


Maxillary 1 st molar1
Maxillary 1st Molar

BuccalOcclusal Lingual

Cusp of Carabelli


Maxillary 2 nd molar
Maxillary 2nd Molar

  • Tooth Numbers: #2 and #15

  • aka: 12 year molars

  • Slightly shorter and smaller than 1st molars

  • Roots are usually longer than 1st molars

  • Trifurcated roots, not as widespread as 1st molar

    • Mesiobuccal, distobuccal, palatal

  • 4 cusps:

    • Mesiolingual, mesiobuccal, distolingual, distobuccal

    • No cusp of Carabelli

  • Age of eruption: 12 – 13 years


Maxillary 2 nd molar1
Maxillary 2nd Molar

BuccalOcclusal Lingual


Maxillary 3 rd molars
Maxillary 3rd molars

Tooth Numbers: #1 and #16

aka: wisdom teeth

Size, shape, and contour differs greatly; may be distorted

Smaller than 1st and 2nd molars

Possibility of 1, 2, or 3 roots; often fused together

Age of eruption: 17 – 21 years


Maxillary 3 rd molar
Maxillary 3rd Molar

BuccalOcclusal Lingual


Maxillary molar comparison
Maxillary Molar Comparison

3rd 2nd 1st 3rd 2nd 1st


Mandibular central incisor
Mandibular Central Incisor

Tooth Numbers: # 24 and # 25

Smallest incisor in mouth; smallest tooth in mouth

Smaller than mandibular lateral

Lingual surface is concave with a flat cingulum

Incisal edge is right angles with mesial and distal

First primary tooth to exfoliate and be replaced by succedaneous tooth

Single root

Age of eruption: 6-7 years


Mandibular central incisor1
Mandibular Central Incisor


Mandibular lateral incisor
Mandibular Lateral Incisor

Tooth numbers: # 23 and # 26

Larger than central incisors

Distal-incisal edge slops apically (toward root)

Cingulum positioned slightly to the distal

Single root

Age of eruption: 7 – 8 years


Mandibular lateral incisor1
Mandibular Lateral Incisor


Mandibular canine
Mandibular Canine

Tooth Numbers: # 22 and # 27

AKA: cuspid or eye-tooth

Smaller and more slender than maxillary canine

Smooth lingual surface; cingulum rarely present

Cusp ridge: distal ridge is longer than mesial ridge

Labial is rounded and prominent

Single root

Age of eruption: 9 – 10 years


Mandibular canine1
Mandibular Canine

Facial Incisal Lingual


Mandibular first premolar
Mandibular First Premolar

Tooth Numbers: # 21 and # 28

AKA: 1st bicuspid

Smaller than 2nd premolars

Large buccal cusp with smaller, non-functional lingual cusp

Transverse ridge across occlusal surface

Rounded buccal surface

Single root

Age of eruption: 10 – 12 years


Mandibular first premolar1
Mandibular First Premolar

Facial Occlusal Lingual


Mandibular second premolar
Mandibular Second Premolar

Tooth Numbers: # 20 and # 29

AKA: 2nd bicuspid

Single buccal cusp with 1 or 2 smaller lingual cusps

Lingual cusps are more prominent than on 1st premolar

Larger and longer root than 1st premolar

Single root

Age of eruption: 11 – 12 years


Mandibular second premolar1
Mandibular Second Premolar

Facial Occlusal Lingual


Mandibular first molar
Mandibular First Molar

  • Tooth Numbers: # 19 and # 30

  • AKA: 6 year molar

  • First permanent tooth to erupt in the mouth

  • Usually largest mandibular tooth

  • 5 well-developed cusps:

    • Mesiobuccal, distobuccal, mesiolingual, distolingual, distal

    • 5th cusp is the distal cusp

    • All cusps are on the lingual surface

  • 2 buccal grooves; 1 lingual groove

  • Crown shape is somewhat rectangular

  • 2 roots: mesial and distal; spaced wide apart

  • Age of eruption: 6 – 7 years


Mandibular first molar1
Mandibular First Molar

Facial Occlusal Lingual


Mandibular second molar
Mandibular Second Molar

  • Tooth Numbers: # 18 and # 31

  • AKA: 12 year molar

  • 4 cusps:

    • Mesiobuccal, distobuccal, mesiolingual, distolingual

    • All located on occlusal surface

    • Lingual cusps are more pointed and longer than buccal cusps

  • 1 buccal groove; 1 lingual groove

  • 2 roots: mesial and distal; not as wide-spread as 1st molars

  • Age of eruption: 11 – 13 years


Mandibular second molar1
Mandibular Second Molar

Facial Occlusal Lingual


Mandibular third molar
Mandibular Third Molar

  • Tooth Numbers: # 17 and # 32

  • AKA: wisdom tooth

  • Size, shape, contour differ widely:

    • Smaller than 1st and 2nd molars

    • More grooves

    • 4-5 cusps, not as defined as 1st and 2nd molars

  • 2 roots: usually fused together

  • Age of eruption: 17 – 21 years


Mandibular third molars
Mandibular Third Molars

Facial Occlusal Lingual


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