Dental Morphology W1

Question 1

What is this called?

Answer 1

Proximal contact area

Question 2

What are A) and B) (bottom)?

Answer 2

A) Interproximal space

B) Interdental papillae:

Question 3

LABEL

Answer 3

A) Mesio-buccal cusp

B) Triangular fossa

C) Central fossa

D) Lingual fossa

Question 4

a) What two processes are involved in pre-emergent eruption?
b) How does it compare to post-emergent eruption?

Answer 4

a) as soon as root formation begins

1- resorption of bone (and primary tooth) overlying the crown (by osteoclasts)

2- propulsive (pushing through) the cleared path

b) from the point of penetrating the gingiva until occlusal level

Question 5

Given that mandibular teeth most likely precede maxillary teeth: What teeth are likely erupting at the below ages:

a) 6-7 dental age
b) 8-9 dental age
c) 9-10 dental age
d) 10-12 dental age
e) 12-13 dental age
f) 15-16 dental age

Answer 5

a) The first permanent mandibular 1st molars
b) eruption of mandibular and maxillary lateral incisors. Continued root formation for first molar and central incisors.
c) mandibular canines close to eruption. Root formation of completed central incisors and first molars. First signs of third molars.
d) eruption of mandibular and maxillary first premolars. continuation of root formation of second premolars, and second permanent molars.
e) of maxillary canines and mandibular second premolars, max and mand second permanent molars. Crown of third permanent molars close to completion.
f) root formation of all permanent molars complete - except third molars. Continuation of third molars root formation.

Question 6

What are the physical differences between dental age 6-7 and 15-16 tooth eruption?

Answer 6

Age 6-7 is eruption of mandibular first molars. Whereas, 15-16 root formation of all permanent molars completed, except for third molars continuing root formation.

Question 7

At what age do maxillary canines erupt?

Answer 7

Dental age 12-13

Question 8

At what dental age do mandibular and maxillary first premolars erupt? What else occurs at this age?

Answer 8

10-12.

Continuation of root formation of second premolars and second permanent molars

Question 9

At what dental age do mandibular canines erupt? What else is occurring at this age?

Answer 9

9-10. Root formation completed for central incisors and first molars. First signs of third molars.

Question 10

What dental age do lateral incisors develop? What else occurs at this age?

Answer 10

8-9. Continuation of root formation for the first molars and central incisors.

Question 11

What is depicted in this image?

Answer 11

Tubercle

Question 12

What is depicted in this image?

Answer 12

Cingulum- convexity on the cervical ⅓ of tooth

Question 13

Label the boundaries of this tooth i.e. medial, distal, palatal, buccal

What does the line denote?

Answer 13

Oblique ridge

Question 14

Identify the term for the orange line and the yellow line

Answer 14

Yellow: angle- where two lines meet

Orange: line angle- where two surfaces meet

Question 15

What are the two arrows pointing too?

Answer 15

Distal and central pit (depression where developmental grooves meet)

Question 16

For the top tooth and bottom tooth what is the terminology used to describe it?

Answer 16

Top tooth: groove = linear depression

Bottom tooth: fissured groove = sinks suddenly - fault in fusion of developmental lobes

Question 17

Which location does gingivitis, perio and caries start?

Answer 17

Interdental papilla

Question 18

What are the four features that distinguish primary from permanent teeth?

Answer 18

Colour, shape, size, number

Question 19

Use Palmer’s to identify the upper right radiograph mixed dentition

Answer 19

Question 20

What is the process of exfoliation of primary teeth?

Answer 20

Resorption of the roots of primary teeth by osteoclasts mediated by tooth follicle and stellate reticulum. The pressure of the permanent tooth (propulsive mechanism) forcing its way into the position held by its predecessor starts the process of osteoclasts ingesting HAP of primary root.

Question 21

What teeth are bicuspid?

Answer 21

Premolars- though Mandibular second pre-molar can have a third cusp

Question 22

Where is the distal triangular fossa in relation to the distal marginal ridge?

Answer 22

Located medially

Question 23

What is the difference between resorption and exfoliation?

Answer 23

Resorption: As the permanent successor erupts, the primary tooth root is resorbed by osteoclasts.

Exfoliation: Entire primary root is resorbed and the primary tooth falls out.

Question 24

Identify and describe what has happened to tooth 2,1

Answer 24

Oblique fracture of the mesioincisal angle of the tooth 21; involving (likely) enamel and dentine; extending from the middle 1/3 of the mesial surface to the middle 1/3 of the incisal margin

Question 25

Label the following

Answer 25

1. Gingiva
2. Gingival margin
3. Interdental papilla
4. Gingival embrasure
5. Contact area
6. Crown of the tooth
7. Incisal embrasure
8. Crown of the tooth anatomically
9. Inter proximal space
10. Cervical line/CEJ
11. Alveolar bone