Dental Anatomy Quiz Mandibular 1st & 2nd Molars

19, 30 vs 18, 31

First Evidence of Calcification of Mandibular 1st Molars 

birth 

First Evidence of Calcification of Mandibular 2nd Molars 

2 ½ - 3 years

Crown Completion of Mandibular 1st Molars

2 ½ - 3 years

Crown Completion of Mandibular 2nd Molars

7-8 years 

Tooth Eruption of Mandibular 1st Molars

6-7 years

Tooth Eruption of Mandibular 2nd Molars

11-13 years

Root Completion of Mandibular 1st Molars 

9-10 years 

Root Completion of Mandibular 2nd Molars

14-15 years

Which of the following is FALSE about the mandibular 1st molar

a. root concavity generally present on the mesial of the mesial root

b. mesiodistal crown dimension widest among all molars

c. five cusps present, including the cusp of Carabelli

d. occlusal outline pentagonal in shape

e. bifurcation closer the crown than that of the mandibular 2nd molar

c. five cusps present, including the cusp of Carabelli

Which of the following teeth may all normally have five cusps

a. #31, #15, #14

b. #14, #30, #18

c. #19, #29, #3

d. #30, #14, #3

d. #30, #14, #3

True or False: Buccal cusps of mandibular molars are inclined lingual 

true 

Identify the pulp section in Fig 7-33

buccolingual section on the mesial of #30

Which root in a mandibular 1st or 2nd molar has two pulp canals?

mesial root

Where is the buccal height of contour on a mandibular 1st or 2nd molar

cervical 1/3

Where is the lingual height of contour on a mandibular 1st or 2nd molar

middle 1/3

Identify the distobuccal cusps of these teeth

C on I and D on II

Which of the following statements are true concerning maxillary and mandibular 3rd molars

1. both have extremely variable and atypical anatomy

2. both can look similar to either a first or second molar

3. maxillary third molars normally occlude with mandibular third molars

4. both have curved sharply pointed, shortened, and fused roots

5. both are generally larger in total size than a first or second molar

1,2,3,4

#19 normally occludes with __

#13 and #14

This is a lingual view of mandibular molars. Which is a mandibular 1st molar?

I

From which view is only one root visible on a mandibular first molar?

mesial

What is the term for the part of the root of a multirooted tooth next to the cementoenamel junction that has not yet split into separate roots?

root trunk 

Which of the following is generally a characteristic of mandibular 1st molars but not mandibular 2nd molars

a. distobuccal groove

b. central fossa

c. buccal groove

d. lingual groove

a. distobuccal groove

True or False: When the tooth is handheld in a vertical direction the buccal cusps are taller in then the lingual cusps

false

True or False: Intraorally the buccal cusps appear taller than the lingual cusps due to the lingual tilt of the mandibular molars 

true 

True or False: The buccal cusps are shaper and more pointed than the lingual cusps on mandibular molars

false

When looking at a mandibular 1st molar, which of the following statements is FALSE

a. the crown is wider on the facial than on the lingual

b. the F-L dimension on the mesial is greater than the F-L on the distal

c. the crown is wider B-L then M-D

c. the crown is wider B-L then M-D

The 1st mandibular molar has how many buccal grooves?

two

The 2nd mandibular molar has how many buccal grooves?

one

Which of the following is the correct HEIGHT ranking for the five cusps (tallest to shortest) in the mandibular 1st molar

a. MB > DB > ML > DL >D

b. ML > DL > MB > DB > D

c. DB > MB > ML > DL > D

d. MB > DB > ML >DL > D

b. ML > DL > MB > DB > D

Which of the following is true of the mesial root of mandibular 1st molars

1. broad buccolingually

2. straight

3. often longer than the distal root

4. minimal or no root depression

1 and 3