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Premolars. Position of Premolars. Posterior Succedaneous teeth. Maxillary Premolars. 1 st : (#5, #12) 2 nd: (#4, #13). Eruption of Maxillary Premolars. 1 st : 10 – 11 years 2 nd : 10 – 12 years. Occlusion. Maxillary cuspids are distal to mandibular cuspids by a ½ a cusp

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Position of premolars
Position of Premolars

  • Posterior

  • Succedaneous teeth


Maxillary premolars
Maxillary Premolars

  • 1st : (#5, #12)

  • 2nd: (#4, #13)


Eruption of maxillary premolars
Eruption of Maxillary Premolars

  • 1st: 10 – 11 years

  • 2nd: 10 – 12 years


Occlusion
Occlusion

  • Maxillary cuspids are distal to mandibular cuspids by a ½ a cusp

  • Maxillary premolars are distal to mandibular premolars by a ½ cusp


Maxillary 1 st premolar
Maxillary 1st Premolar

  • Mesial/distal view

    • CEJ straighter than anteriors

    • Buccal and lingual cusps centered over the root

    • Mesial concavity

    • Buccal cusp larger than lingual

    • Single or bifurcated root. Bifurcation more common.


Maxillary 1 st premolar1
Maxillary 1st Premolar

  • Occlusal view

    • Point angles are sharp on buccal, rounded on lingual

    • More rounding on the distolingual than the mesiolingual.

    • Hexagontal or pentagontal outline

    • Bulkier on the mesial

    • Sharper line angles on the mesial than the distal.

    • Mesial marginal ridge with a mesiomarginal groove

    • Transverse ridge


Maxillary 1 st premolar2
Maxillary 1st Premolar

  • Buccal view

  • Mesial view

  • Lingual view

  • Occlusal view


Maxillary 1 st premolar lingual view
Maxillary 1st Premolar (Lingual view)

  • Premolars and 1st molar: # 5, #4, #3, left to right

Maxillary Right (#5)


Maxillary 2 nd premolar
Maxillary 2nd Premolar

  • No mesial concavity or groove

  • Buccal and lingual cusps of equal size

  • Usually one root

  • Short central groove, more secondary grooves

  • Heavier marginal ridges

Max. R 1st premolar, #5


Maxillary 2 nd premolar1
Maxillary 2nd Premolar

  • Occlusal view:

    • Cusps bulk on the mesial

    • Rectangular or oval occlusal table

Max. R 1st premolar, #5


Maxillary 2 nd premolar2
Maxillary 2nd Premolar

  • Distal view: More of the occlusal table can be seen from the distal than from the mesial view. (True of 1st premolar also.)

  • Usually only one root, sometimes bifurcated.

Distal view

Mesial view


Maxillary 2 nd premolar3
Maxillary 2nd Premolar

  • Buccal view

  • Distal view

  • Lingual view

  • Occlusal view


Maxillary premolars buccal view
Maxillary Premolars (Buccal view)

5

Tip of the buccal cusp is distal to the midline, therefore the mesial cusp

ridge is longer than the distal cusp ridge.



Maxillary premolars mesial distal
Maxillary Premolars (Mesial/Distal)

  • Notice the depression on the first premolar on the mesial view.

2 roots

1 root


Maxillary premolars occlusal view
Maxillary Premolars(Occlusal view)


Mandibular premolars
Mandibular Premolars

  • Mandibular 1st: (#21, #28)

  • Mandibular 2nd: (#20, #29)


Mandibular premolars1
Mandibular Premolars

  • Mandibular 1st: Two cusps (Buccal and an afunctional lingual cusp)

  • Mandibular 2nd: Two or three cusps (One buccal, with one or two lingual cusps. Lingual cusp(s) afunctional.)


Eruption of mandibular premolars
Eruption of Mandibular Premolars

  • Mandibular 1st: 10 – 12 years of age

  • Mandibular 2nd: 11-12 years of age

  • Roots complete: 12 – 14 years of age


Occlusion of mandibular premolars
Occlusion of Mandibular Premolars

  • Mandibular 1st: Maxillary cuspid and 1st premolar

  • Mandibular 2nd: Maxillary 1st and 2nd premolars

  • Lingual tipping of crowns


Mandibular 1 st premolar
Mandibular 1st Premolar

  • Two cusps: large buccal and small lingual

  • Mesiolingual groove

  • Mesial cusp ridge is shorter than distal cusp ridge

  • Tip of the buccal cusp is centrally located over the root

Mandibular R 1st premolar


Mandibular 1 st premolar1
Mandibular 1st Premolar

Only premolar where more of the occlusal table can be seen from the mesial view, rather than the distal view

Mandibular R 1st premolar


Mandibular 1 st premolar2
Mandibular 1st Premolar

  • Occlusal view:

    • Transverse ridge (union of two triangular ridges)

    • Pits

    • Diamond-shaped or triangular shaped

Mandibular R 1st premolar


Mandibular 1 st premolar left
Mandibular 1st Premolar (Left)

  • Buccal view

  • Mesial view

  • Lingual view

  • Occlusal view


Mandibular 2 nd premolar
Mandibular 2nd Premolar

  • Two or three cusps

    • Buccal cusp is the largest

    • In a 3 cusp form: ML is the second largest, DL is the smallest

  • Bulks to the mesial

  • Square or rectangular occlusal table

Mandibular R 2nd premolar


Mandibular 2 nd premolar1
Mandibular 2nd Premolar

  • Occlusal view

    • Y shape: B, ML, DL

    • H shape: B, L

    • U shape: B, L

    • Most common

Mandibular R 2nd premolar


Mandibular 2 nd premolar right
Mandibular 2nd Premolar (Right)

  • A. Buccal view

  • B. Occlusal view

  • C. Distal view





Mandibular 2 nd premolars occlusal view
Mandibular 2nd Premolars(Occlusal view)


References
References

Woelfel and Scheid. Dental Anatomy,

6th Edition. Lippencott, Williams, and Wilkins,

2002, p. 148 - 174.

Brand and Isselhard. Anatomy of Orofacial

Structures,

6th Edition. Chapter 32 (p. 400 – 425),

7th Edition. Chapter 14 (p. 146 – 165).

http://www.youtube.com/watch?v=524GZfAQWyQ

http://www.youtube.com/watch?v=Ffz_P-eeR9o


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