Dental Anatomy Quiz Maxillary 1st & 2nd Premolars

#5, #12 vs #4, #13

First Evidence of Calcification in Maxillary 1st Premolars

1 ½ - 1 ¾ years

First Evidence of Calcification in Maxillary 2nd Premolars

2 - 2 ¼ years

Crown Completion of Maxillary 1st Premolars

5-6 years

Crown Completion of Maxillary 2nd Premolars

6-7 years

Tooth Eruption of Maxillary 1st Premolars

10-11 years

Tooth Eruption of Maxillary 2nd Premolars

10-12 years

Root Completion of Maxillary 1st Premolars

12-13 years

Root Completion of Maxillary 2nd Premolars

12-14 years

The maxillary 1st premolar is NOT characterized by

a. a deep mesial concavity

b. bifurcated roots

c. a continuous distal marginal ridge

d. an octagonal occlusal outline

e. a central pit

e. a central pit

Identify C on Fig. 5-30-I

lingual cusp

Identify Fig I

a. #12

b. #4

c. #13

d. #5

b. #4

The maxillary second premolar is generally identified by which of the following characteristics

a. short central groove

b. buccal cusp ridge parallel to the central groove

c. lingual and buccal cusps are not equal in height

d. prominent mesial marginal groove

e. bifurcated roots

a. short central groove

Which surface is indicated by B on this pulpal section

mesial

Identify II of Fig 5-31

mesiodistal section of #4 on the buccal

The distal triangular fossa on a premolar is bounded by which of the following

a. dentilingual groove, distobuccal groove, and distal marginal ridge

b. distal marginal ridge, distal marginal groove, buccal cusp

c. central groove, distal pit, dentilingual groove

d. distobuccal groove, distolingual groove, distal marginal groove

a. dentilingual groove, distobuccal groove, and distal marginal ridge

The central sulcus is

a. centered over the root trunk on #12

b. rectangular in shape on #13

c. formed by the meeting of the inner inclines of the buccal and lingual cusps

d. a and b

e. a and c

e. a and c

Which of the following is located between the CEJ and the point of trifurcation or bifurcation

a. occlusal third

b. root trunk

c. apical third

d. marginal groove

b. root trunk

The lingual cusp of #4 normally occludes

a. on the distal marginal ridge of #28 and the mesial marginal ridge of #29

b. on the distal marginal ride of #29 and the mesial marginal ridge of #30

c. on the distal fossa of #28

d. on the mesial fossa of #29

e. none of the above 

b. on the distal marginal ride of #29 and the mesial marginal ridge of #30

Which of the following statements is true

1. the 2nd premolar erupts at age 10-12

2. the 1st premolar erupts at age 8-9

3. the 1st premolar starts calcifying at between 1-2 years

4. the 2nd premolar erupts a year before the 1st premolar

1,3

Identify the teeth I and II respectively

#4 and #5

Pick the statement that is true about a maxillary 2nd premolar

a. central groove is shorter than for a maxillary 1st premolar

b. it has a mesial marginal ridge groove

c. it has 2 bifurcated roots

d. its central groove crosses the mesial marginal ridge

a. central groove is shorter than for a maxillary 1st premolar

In the facial view the maxillary 1st premolar has the following when compared against the maxillary second premolar

a. distal cusp ridge is longer than the mesial cusp ridge

b. less crown taper from the contacts to cervix

c. sharper buccal cusp angle

d. less prominent buccal ridge 

c. sharper buccal cusp angle

In the occlusal view, the maxillary 2nd premolar has the following when compared against the maxillary 1st premolar

a. mesial marginal ridge grooves

b. more rounded (oblong or oval shape) outline form

c. more tapering towards the lingual

d. more asymmetrical crown

b. more rounded (oblong or oval shape) outline form

In the lingual view, the maxillary 1st premolar has the following when compared to the maxillary 2nd premolar

a. the lingual root is usually longer than the facial root

b. a buccal cusp that is 1-2mm taller than the lingual cusp

c. less crown taper towards the lingual than the 2nd premolar

d. a buccal cusp that is similar in height to the lingual cusp

b. a buccal cusp that is 1-2mm taller than the lingual cusp

In the proximal view, the maxillary 2nd premolar has the following when compared to the 1st maxillary premolar

a. usually a single root

b. more unequal cusp height

c. more prominent mesial crown concavity

a mesial marginal ridge groove

a. usually a single root

Which maxillary premolar has the higher root to crown ratio

second