|
Maxillary Left Second Premolar |
 |
|
Universal: 13 International (FDI): 25 |
|
|
CHARACTERISTICS |
SECOND PREMOLAR |
|
Facial/Buccal Aspect |
|
|
Proximal contacts |
Mesial/distal: middle third |
|
Shoulders |
Narrow |
|
Buccal cusp |
Not tipped |
|
Cusp ridges |
Similar |
|
Cusp size, height |
Shorter |
|
Lingual Aspect |
Profile not visible |
|
Mesiomarginal groove |
Does not cross ridge |
|
Mesial concavity |
Not present |
|
Mesial root depression |
Present |
|
Occlusal Aspect |
|
|
Profile |
Ovoid |
|
Central groove |
Short |
|
Supplemental groves |
Many; often present |
|
Lobes |
4 |
|
Pulp horn(s) |
2 |
|
Dimensions |
|
|
Crown length |
8.5 mm (cervico-occlusal) |
|
Crown diameter |
|
|
Mesiodistal |
7.0 mm |
|
Cervical |
5.0 mm |
|
Buccolingual |
9.0 mm |
|
Contour height |
|
|
Facial/buccal crest |
Cervical third |
|
Lingual |
Middle third |
|
Root |
|
|
Length |
14.0 mm |
|
Grooves |
No distinct grooves |
|
Number of roots |
1 |
|
Pulp canal(s) |
Usually 1 |
|
Chronology |
|
|
Eruption |
10-12 yr |
|
Root completed |
12-14 yr |
|
Maxillary Left Third Molar |
 |
|
Universal: 16 International (FDI): 28 |
|
|
CHARACTERISTICS |
THIRD MOLAR |
|
Facial/Buccal Aspect |
|
|
Dimensions |
Smallest of three maxillary molars |
|
Distobuccal cusp height |
Much less than mesiobuccal cusp |
|
Proximal contacts |
Cervical-occlusal location of mesial contact |
|
is at middle third, distal contact is at |
|
|
middle third |
|
|
Lingual Aspect |
|
|
Distolingual cusp |
Usually missing |
|
Lingual root |
Narrowest |
|
Occlusal Aspect |
|
|
Crown form |
Heart-shaped |
|
Lobes |
3 or 4 |
|
Dimensions |
|
|
Crown length |
6.5 mm (cervico-occlusal) |
|
Crown diameter |
|
|
Mesiodistal |
8.5 mm |
|
Cervical |
6.5 mm |
|
Buccolingual |
10.0 mm |
|
Contour height |
0.5 mm |
|
Buccal crest |
Cervical third |
|
Lingual crest |
Middle third |
|
Root |
|
|
Length, buccal |
11.0 mm |
|
Length, lingual |
Roots fused usually |
|
Chronology |
|
|
Eruption |
17-21 yr |
|
Root completed |
18-25 yr |
|
Maxillary Left Second Molar |
 |
|
Universal: 15 International (FDI): 27 |
|
|
CHARACTERISTICS |
SECOND MOLAR |
|
Facial/Buccal Aspect |
|
|
Dimensions |
Width between that of first and third |
|
maxillary molars |
|
|
Distobuccal cusp height |
Slightly less than mesiobuccal cusp |
|
Proximal contacts |
Cervical-occlusal location of mesial contact |
|
is at middle third, distal contact is at |
|
|
middle third |
|
|
Lingual Aspect |
|
|
Distolingual cusp |
Smaller width/height |
|
Lingual root |
Narrower |
|
Occlusal Aspect |
|
|
Crown form |
More rhomboidal |
|
Lobes |
4 |
|
Dimensions |
|
|
Crown length |
7.0 mm (cervico-occlusal) |
|
Crown diameter |
|
|
Mesiodistal |
9.0 mm |
|
Cervical |
7.0 mm |
|
Buccolingual |
11.0 mm |
|
Contour height |
0.5 mm |
|
Buccal crest |
Cervical third |
|
Lingual crest |
Middle third |
|
Root |
|
|
Length, buccal |
11.0 mm |
|
Length, lingual |
12.0 mm |
|
Chronology |
|
|
Eruption |
12-13 yr |
|
Root completed |
14-16 yr |
