16. 16. Morphology of the premolar teeth.

Question 1

1. Maxillary First Premolar
   a/ Function of maxillary first premolar

Answer 1

A. 14, 24
B. The function of this premolar is similar to that of canines in regard to tearing being the principal action during mastication (chewing).

Question 2

1. Maxillary First Premolar
   b/ Structure of maxillary first premolar

Answer 2

A. 14, 24
B. There are two cusps (bicuspid) on maxillary first premolars
C. The buccal (closest to the cheek) cusp is sharp enough to resemble the prehensile teeth found in carnivorous animals.

Question 3

1. Maxillary First Premolar
   b/ Occlusal surface of maxillary first premolar => identify?

Answer 3

(1) Mesial outer aspects of the buccal cusp
(2) Distal outer aspects of the buccal cusp
(3) Mesial outer aspects of the oral cusp
(4) Distal outer aspects of the oral cusp
(5) Mesial inner aspects of the buccal
(6) Distal inner aspects of the buccal
(7) Mesial inner aspect of the oral cusp
(8) Distal inner aspects of the oral cusp
(9) Mesial marginal ridges
(10) Distal marginal ridges

Question 4

2. Maxillary second premolar
   a/ Structure of maxillary second premolar

Answer 4

A. 15, 25
B. There are two cusps on maxillary second premolars, but both of them are less sharp then those of the maxillary first premolars.

Question 5

2. Maxillary second premolar
   B/ Functions of maxillary second premolar

Answer 5

A. 15, 25
B. The function of this premolar is similar to that of first molars in regard to grinding being the principal action during chewing (mastication).

Question 6

3. Mandibular first premolar
   a/ Structure of mandibular first premolar

Answer 6

A. 34, 44
B. Mandibular first premolars have two cusps. The one large and sharp is located on the buccal side (closest to the cheek) of the tooth.
C. Since the lingual cusp (located nearer the tongue) is small and nonfunctional (which refers to a cusp not active in chewing), the mandibular first premolar resembles a small canine.

Question 7

3. Mandibular first premolar
   B/ Function of mandibular first premolar

Answer 7

A. 34, 44
B. The function of the premolar is similar to that of canines in regard to tearing being the principal action during chewing.canine.

Question 8

4. Mandibular second premolar
   a/ Structure of mandibular second premolar

Answer 8

A. 35, 45
B. Mandibular second premolars have three cusps.
C. One large cusp on the buccal side of the tooth.
D. The lingual cusps are well developed and functional (which refers to cusps assisting during chewing).
=> Therefore, the mandibular second premolar is more alike to the first molar.

Question 9

4. Mandibular second premolar
   b/ Function of mandibular second premolar

Answer 9

The function of this premolar is to assist the mandibular first molar during mastication.