Occlusal SurfacesPremolars & Molars

ByDr Asrar Ahmed

Permanent Maxillary Right 1st Premolar

Components of the

occlusal table

• Fossae

Mesial triangular fossa

Distal triangular fossa

Permanent Maxillary Right 1st Premolar

Components of the occlusal table

• Pits & grooves Mesial pit

1. Central groove

2. Mesiolingual triangular groove

3. Mesiobuccal triangular groove

4. Mesial marginal groove

Buccal

Palatal

Permanent Maxillary Right 1st Premolar

Components of the

occlusal table Distal pit

1. Distolingual triangular

groove

2. Distobuccal triangular

groove

3. Central groove

Permanent Maxillary Right 2nd Premolar

Occlusal aspect• Outline• Short central groove• Mesial marginal

groove D M

PALATAL

BUCCAL

Permanent mandibular right 1st premolar Components Of Occlusal Table

3. Fossae• Mesial fossa• Distal fossa

M D

Permanent mandibular right 1st premolar Components Of Occlusal Table

4. Pits & groovesI. Mesial pit1) Central groove2) Mesiobuccal

triangular groove3) Mesiolingual

developmental groove

M D

Permanent mandibular right 1st premolar Components Of Occlusal Table

II. Distal pit1) Central groove2) Distal marginal

groove3) distobuccal

triangular groove4) distolingual

triangular groove

M D

Permanent Mandibular Right 2nd Premolar Three cusp type (Y-type)

Pits & groovesCentral pit1. Central groove2. Lingual groove

Permanent Mandibular Right 2nd Premolar Two cusp type (H & U type)

• Outline-rounded• Position of lingual cusp• Transverse ridge

Fossae• Mesial & distal fossae

Boundries1. Transverse ridge2. Marginal ridges3. Cusp ridges

Permanent Mandibular Right 2nd Premolar Two cusp type (H type)

Pits & groovesMesial & distal pits1. Central groove2. +respective triangular

grooves3. +respective marginal

grooves

Permanent Mandibular Right 2nd Premolar Two cusp type (U type)

Pits & grooves• Same as for Y type

Permanent maxillary right 1st molarOcclusal Aspect

D

B

P

M

Central pit

Mesial pit

Distal pit

Central groove

Buccal groove

Mesial marginal groove

Mesiobuccal T groove

Mesiopalatal T groove

Distal marginal groove

Distobuccal T groove

Distopalatal T groove

Distopalatal groove

Permanent Right Mandibular 1st Molar

DM

B

L

Occlusal aspect Central pit

Mesial pit

Distal pit

Mesiobuccal groove

Distobuccal groove

Lingual groove

Central groove

Mesiobuccal T groove

Mesiolingual T groove

Mesial marginal groove

Central groove Distolingual T groove Distal marginal groove