Canines
Maxillary Canine
The labiolingual measurement of
the crown is about 1 mm greater
than that of the maxillary central
incisor,
The mesiodistal measurement is
approximately 1 mm less,
Labial Aspect
Lingual Aspect
Mesial Aspect
Distal Aspect
Ridge Aspect
Root
Mandibular Canine
Labial Aspect
Lingual Aspect
Mesial Aspect
Distal Aspect
Ridge Aspect
Root
Application
1） Stone of the oral corner,
2） Less carie,
3） Always worked as based tooth
Premolar
Maxillary first premolar
Characteristics,
1 buccolingual measurement>mesiodistal
measurement,
2 Broader contact areas
3 Contact areas more nearly at the same level
4 Less curvature of the cervical line mesially
and distally,
5 Shorter crown,cervico-occlusally when
compared with anterior teeth,
Labial Aspect
Lingual Aspect
Mesial Aspect
Distal Aspect
Occlusal Aspect,
? Six-sided or hexagonal figure
? Cusp:buccal cusp,lingual cusp
? Ridge,marginal ridge,cusp ridge
? Fossa:mesial triangular fossa,distal
triangular
? Developmental groove:central
development groove,
Root
Maxillary second premolar
The maxillary second premolar is less
angular,giving a more rounded effect to
the crown from all aspects.It has a single
root,
Labial Aspect
Lingual Aspect
Mesial Aspect
Distal Aspect
Occlusal Aspect
The outline of the crown is more rounded or
oval,rather than angular.The central
developmental groove is shorter and more
irregular,and there is a tendency toward
multiple supplementary grooves radiating
from the central groove,
Mandibular first premolar
1 The buccal cusp is long and sharp and is
the only occluding cusp,
2 The buccolingual measurement is similar
to that of the canine,
3 The occlusal surface slopes sharply
lingually in a cervical direction,
4 The mesiobuccal cusp ridge is shorter
than the distobuccal cusp ridge,
5 The outline form of the occlusal aspect
resembles the outline form of the incisal
aspect of the canine,
Labial Aspect
Lingual Aspect
Mesial Aspect
Distal Aspect
Occlusal Aspect
1 The buccal cusp is prominent,
2 The marginal ridges are well developed,
3 The lingual cusp is small,
4 The occlusal surface shows a heavy buccal
triangular ridge and a small lingual triangular ridge,
5 two depressions,mesial and distal fossae,
6 groove,mesial developmental groove,
Mesiolingual developmental groove,distal
developmental groove,
Mandibular second premolar
This tooth assumes two common forms,
The first form,which probably occurs
most often,is the three-cusp type.The
second form is the two-cusp type,
The two types differ mainly in the occlusal
design,
Labial Aspect
Lingual Aspect
Mesial Aspect
Distal Aspect
Occlusal Aspect
Three-cusp type,
1 the buccal cusp is the largest,the mesiolingual
cusp is next,and the distolingual cusp is the
smallest,
2 each cusp has well-formed triangular ridges,
3 starting at the central pit,the mesial
development groove,distal developmental groove
and the lingual developmental groove,These
grooves converge and form a,Y”,
Two-cusp type,
The occlusal characteristics of the two-cusp type,
1 there is one well-developed lingual cusp directly
opposite the buccal cusp in the lingual direction,
2 A central developmental groove is most often
crescent-shaped,
3 Some show mesial and distal developmental
pits:mesial developmental groove,distal
developmental groove,Three grooves converge
and form,U”,”H”