Premolars Flashcards
Larger maxillary premolar is:
First (5/12 > 4/13)
Maxillary 1st: Cusps
Sharp buccal/lingual cusps - buccal 1mm longer
Mesial cusp slope on buccal cusp is longer
ALL Premolars: Contacts
Mesial and Distal = cervical to junction of occlusal and middle 3rds (both maxillary)
ALL Premolars: HOC
Labial = cervical 3rd Lingual = middle 3rd
Maxillary Longer Central Groove
1st
Mesial Marginal Groove
1st Maxillary Premolar
Mesial Developmental Depression across CEJ
Maxillary 1st Premolar (R/L)
Two Roots =
Maxillary 1st Premolar
Maxillary Second Premolars: Cusps
Same length, “wrinkled”, *lingual cusp displaced mesially (R/L)
Leeway Space
Difference between space of primary tooth vs permanent - clinical consideration for: Maxillary Second Premolars
Mandibular First Premolars: Cusps
Buccal only functional. Mesial buccal shorter than distal slope
Mesiolingual Groove
Mandibular First Premolars (R/L)
Mandibular First Premolars: Root
Single, shorter than 2nd Mand.
Snake Eyes
Clinical consideration: Mandibular First Premolars - fillings in two round fossae
Larger Mandibular Premolar:
Mandibular Second Premolars
Mandibular Second Premolars: Cusps
3 cusps = 5 lobes (Distolingual cusp smaller than mesiolinual)
2 cusps = 4 lobes
Shorter buccal cusp than 1st mand premolars
Possible 2 or 3 cusps:
Mandibular Second Premolars
2 Cusp Form:
U or H shape w 2 pits, distolingual developmental depression
Mandibular Second Premolar
3 Cusp Form:
Y shape, 3 pits, lingual groove between cusps
Mandibular Second Premolar
Mandibular Second Premolar: Root
Single, larger/longer than mand 1st, root concavities
Hypodontia
Partial anodontia- congenitally missing
Clinical consideration for Mandibular Second Premolar
