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General Characteristics of All Posterior Teeth
- Two or more cusps
- Occlusal table with ridges and grooves
- Marginal ridges perpendicular to long axis of the tooth
- Facial height of contour: cervical third
- Lingual height of contour: middle third
General Premolar Features
- One buccal cusp
- One (or two) lingual cusps
- Transitional between canines and molars in function
- Why is the term bicuspid inaccurate?
Premolar Occlusal Table
- Each cusp has 4 cusp ridges.
- One cusp ridge = triangular ridge.
- Two triangular ridges = transverse ridge.
- Marginal ridges border the occlusal table.
- Buccal and lingual cusps of nearly equal size
- Occlusal surface wider buccolingually than mesiodistally
- 1st larger than 2nd
Maxillary 1st Premolar
- Two roots: buccal and lingual
- Angular occlusal table
- Mesial marginal developmental groove
- Mesial crown concavity
- Buccal cusp slightly longer than lingual
- Lingual cusp offset to mesial when viewed from lingual aspect
Maxillary 2nd Premolar
- Single root
- Rounded occlusal table
- Buccal and lingual cusps nearly equal
- Buccal and lingual cusps in line
- No mesial groove and concavity
Maxillary 2nd Premolar:
- how to tell mesial from distal
- List features that distinguish maxillary 1st and 2nd premolars.
- Large buccal cusp
- 2nd larger than 1st
- Very small lingual cusp(s)
- Buccolingual = mesiodistal crown dimension
- Lingual inclination of buccal surface
Lingual Inclination of Mandibular Posterior Teeth
- Permits good interdigitation of opposing maxillary and mandibular teeth in ICP
- Applies to molars and premolars
Mandibular 1st Premolar
- Long, sharp buccal cusp
- Transitional form
- Very small lingual cusp
- ML developmental groove
Mandibular 2nd Premolar
- Only premolar with 3 cusps
- Buccal cusp is largest
- ML cusp > DL cusp
Location of ICP Contacts
- Introduction to ICP Contacts
- Supporting Cusps in ICP
- Maxillary lingual
- Mandibular buccal
- The Picket Fence: a Model for Locating ICP Contacts
- Where would you expect to see ICP contacts on #13?
- Which is the supporting cusp?
- Where do opposing supporting cusps contact this tooth?
#13 ICP Contacts
- Lingual cusp is the supporting cusp
- Contacts on each marginal ridge made by opposing supporting cusps