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MandibularRound
Mandibular Second Premolar
Mandibular Second Premolar - Axial View showing round/oval access cavity
Average Length22.3 mm
Root Development14 years
Universal #20, 29
FDI #35, 45
Access Cavity Design
ShapeRound/Oval
OrientationSlight buccolingual orientation
Entry PointCentral sulcus of occlusal surface
Canal Anatomy
Configurations
Single canal92-97.5%
Two canals2.5-8%
Canal Positions
MCMain Canal
Band-shaped when single, requires careful debridement
Clinical Tips
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Tip
Most predictable mandibular premolar - single canal predominates
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Warning
Still check for variations - don't assume single canal
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Warning
Same lingual perforation risk as first premolar