Dental Anatomy

Question 0

The mucogingival junction separates…

Answer 0

attached gingiva from alveolar mucosa

Question 1

Sharpey’s Fibers

Answer 1

a continuation of the PDL into cementum and bone (much thicker on the bone side)

Question 2

The free gingival groove separates…

Answer 2

free gingiva from attached gingiva

Question 3

What is the PDL derived from?

Answer 3

The dental sac

Question 4

The prime mover in a working side movement is…

Answer 4

the contralateral lateral pterygoid

Question 5

The main movers in protrusive movement are….

Answer 5

both lateral pterygoids (unassisted!)

Question 6

Which movements do the lateral pterygoids perform?

Answer 6

Opening the mouth/depressing the mandible (also uses anterior belly of the digastric and omohyoids)
Protruding the mandible

Question 7

Opening the mouth/depressing the mandible requires the use of which muscles?

Answer 7

lateral pterygoinds
anterior belly of the digastric
omohyoids

Question 8

List the 4 dental factors which promote health of the PDL by resisting occlusal force

Answer 8

1. anterior teeth with slight or no contact in CR
2. an occlusal table that makes up less than 60% of the overall FL width
3. an occlusal table at right angles to the long axis of the tooth
4. crowns of mandibular molars with 15-20% incine lingally and roots facially

Question 9

Where are gingival fibers located?

Answer 9

in the free gingiva only

Question 10

Where are pits located?

Answer 10

At the junction or terminals of developmental grooves

Question 11

Where are transverse ridges most common?

Answer 11

maxillary premolars and mandibular molars

Question 12

Where are oblique ridges found? What cusps do they connect?

Answer 12

maxillary molars
ML cusp (distal ridge) and DB cusp (triangular ridge)

Question 13

What are 3 characteristics common to all mandibular teeth?

Answer 13

1. indistinct cingula, no grooves or pits
2. incisal edges are lingual to the root axis line
3. continuous convexity incisoapically on the facial surface

Question 14

Is alveolar bone thinner on the facial or lingual of central incisors (maxillary and mandibular?

Answer 14

facial

Question 15

What shape is the mesial/distal aspect of all maxillary posterior teeth?

Answer 15

trapezoidal

Question 16

what shape is the mesial/distal aspect of all mandibular posterior teeth?

Answer 16

rhomboidal

Question 17

what is the shape of the mesial/distal aspect of all anterior teeth?

Answer 17

triangle

Question 18

What is the shape of all incisors (maxillary and mandibular) from the buccal/lingual?

Answer 18

trapezoid

Question 19

What is the shape of all posterior teeth (maxillary and mandibular) from the buccal/lingual?

Answer 19

trapezoidal

Question 20

Name 3 teeth with a centered cingulum

Answer 20

maxillary lateral
maxillary canine
mandibular central

Question 21

Name 3 teeth with a cingulum located off center toward the distal

Answer 21

maxillary central
mandibular lateral
mandibular canine

Question 22

Which cusp ridge is longest on the permanent canines?

Answer 22

distal cusp ridge

Question 23

Where is the HOC on lingual of all maxilary and mandibular posteriors?

Answer 23

middle third

Question 24

Where is the HOC on the facial of all anterior and posterior teeth?

Answer 24

cervical third

Question 25

Where is the HOC on the lingual of all anterior teeth?

Answer 25

cervical third (on the cingulum)