Dental Anatomy of Lower Premolars and Mandibular Growth
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Lower First Premolar
Prominent Elevations & Depressions/Snake-Snail Eye Lingually
Chronology
- Enamel: 5-6 years old
- Eruption: 10-11 years old
- Root: 12-13 years old
Geometry
- Lingual/Buccal: Trapezoid; short side cervical
- Mesio-Distal: Rhomboidal
- Occlusal: Diamond
Buccally
- Cervical Ridge
- Buccal Ridge
- Mesio-Distal Buccal Developmental Groove
Lingually
- Mesio-lingual Developmental Groove
Mesially
- Mesio-lingual Developmental Groove
Mesial Contact Area
- Junction between buccal and middle thirds
Distal Contact Area
- Middle third
Occlusally
- 2 well-developed cusps
- Each cusp: triangular ridge
- Mesial/Distal Marginal Ridges
- Triangular Fossae
- Developmental Pits
- Central Developmental Groove
- Transverse Ridge
- Mesio-lingual Developmental Groove