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Mandibular Left Second Premolar |
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Universal: 20 |
International (FDI): 35 |
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CHARACTERISTICS |
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SECOND PREMOLAR |
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Facial/Buccal Aspect |
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Proximal contacts |
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Cervico-occlusal |
Mesial/distal, middle third |
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Form |
Bilaterally symmetrical |
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Lingual Aspect |
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Buccal profile |
None seen |
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Cusp height |
Buccal/lingual cusps nearly equal |
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Mesial Aspect |
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Occlusal plane |
Essentially horizontal |
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Transverse ridge or |
buccal triangular ridge |
No transverse ridge present |
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Occlusal Aspect |
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Outline form |
Square |
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Cusps |
2 or 3 |
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Lobes |
4 or 5 |
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Dimensions |
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Crown length |
8.0 mm (cervico-occlusal) |
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Crown diameter |
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Mesiodistal |
7.0 mm |
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Cervical |
5.0 mm |
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Buccolingual |
8.0 mm |
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Contour height |
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Facial |
Middle third |
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Lingual |
Middle third |
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Root |
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Length |
14.5 mm |
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Pulp canal(s) |
1 |
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Pulp horn(s) |
2 |
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Chronology |
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Eruption |
11-12 yr |
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Root completed |
13-14 yr |
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Mandibular Left Third Molar |
Palmer 8 |
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UNIVERSAL: 17 INTERNATIONAL (FDI):38 |
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CHARACTERISTICS |
THIRD MOLAR |
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Facial/Buccal Aspect |
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Crown size |
Smallest of three mandibular molars |
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Cusps |
4 Cusps: mesiobuccal, distobuccal, mesiolingual, distolingual |
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Proximal contacts |
Cervical-occlusal location of mesial contact is at middle third, distal contact is at middle third |
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Groove(s)/pit(s) |
1 Buccal ± pit |
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Root(s) |
Most short, fused, less inclination |
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Lingual Aspect |
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Cervix |
Less narrow |
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Occlusal Aspect |
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Crown form |
Quadrilateral or ovoid |
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Lobes |
4 |
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Pulp horn(s) |
4 |
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Dimensions |
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Crown length |
7.0 mm (cervico-occlusal) |
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Crown diameter |
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Mesiodistal |
10.0 mm |
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Cervical |
7.5 mm |
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Buccolingual |
9.5 mm |
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Contour height |
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Buccal crest |
Cervical third, 0.5 mm |
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Lingual crest |
Middle third, 1.0 mm |
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Root |
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Length |
11.0 mm |
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Chronology |
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Eruption |
17-21 yr |
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Root complete |
18-25 yr |
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Mandibular Left Second Molar |
Palmer: |"7 |
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Universal: 18 International (FDI): 37 |
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CHARACTERISTICS |
SECOND MOLAR |
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Facial/Buccal Aspect |
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Crown size |
Smaller than first mandibular molar |
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Cusps |
4 Cusps: mesiobuccal, distobuccal, mesiolingual, distolingual |
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Proximal contacts |
Cervical-occlusal location of mesial contact is at middle third, distal contact is at middle third |
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Groove(s)/pit(s) |
1 Buccal ± pit |
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Root(s) |
Close together, parallel; distally inclined |
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Lingual Aspect |
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Cervix |
Less narrow |
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Occlusal Aspect |
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Crown form |
Quadrilateral or rectangular |
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Lobes |
4 |
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Pulp horn(s) |
4 |
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Dimensions |
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Crown length |
7.0 mm (cervico-occlusal) |
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Crown diameter |
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Mesiodistal |
10.5 mm |
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Cervical |
8.0 mm |
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Buccolingual |
10.0 mm |
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Contour height |
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Buccal crest |
Cervical third, 0.5 mm |
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Lingual crest |
Middle third, 1.0 mm |
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Root |
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Length |
13.0 mm |
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Chronology |
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Eruption |
11-13 yr |
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Root complete |
14-15 yr |
