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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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Presentation Transcript
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

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
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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