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BDS2 Paediatric dentistry > Primary tooth morphology > Flashcards

Flashcards in Primary tooth morphology Deck (56)
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1

What are early problems that can affect children even before they are born

- gingival cysts
- congenital epulis
- natal or neonatal teeth
- eruption cysts

2

What are gingival cysts also known as

epstein's pearls or bohns nodules

3

what do gingival cysts look like? Are they a problem?

small white 'pearls'

4

What does a congenital epulis look like? What happens to them? Are they a problem?

a massive red bulge out of the mucosa.
will shrink as child grows or can be removed. Not dangerous

5

What problems can natal or neonatal teeth cause?
do they tend to be removed?

can be mobile and cause ulcers, not got as strong roots. Sometimes are taken out if a big interference but otherwise not.

6

What does an eruption cyst look like? What causes it? Is it a problem?

a blue blob on the mucosa, blood has got in there, no it will resolve

7

what is the notation of an upper right second primary molar?
What is really important about primary tooth notation

5,5
or
upper right E

never use numbers and letters together

8

When do teeth start to form?

week 5 of intrauterine life

9

When does hard tissue start to form

week 13 of iul

10

What are the calcification dates of the maxilary central incisor

start cal 13-16 weeks iul
crown complete 1.5 months after birth
eruption 8-12 months
root complete 33 months

(see welbury text page 12)

11

What is the chronology of the maxilary second primary molar
(hard tissue formation, crown formation, eruption, complete root formation)

hard tissue formation 16-23 weeks iul
crown formation complete at 11 months after birth
eruption between 25-33 months
complete root formation 47 months

12

How might the process of calcification cause defects in primary teeth

- systemic disturbances during calcification can lead to defects in the enamel which was forming at that time

- defects in the primary dentition (which are not hereditary) are most likely the result of a difficult pregnancy for the mother/ birth complications

13

How much of central incisors are calcified at birth

1/2

14

How much of lateral incisors are calcified at birth

1/3

15

How much of primary canines are calcified at birth

the tip

16

How much of first primary molars are calcified at birth

1/2

17

How much of second primary molars are calcified at birth

1/3

18

How much of permanent molars are calcified at birth

tip of cusps

19

what are the possible theories behind tooth eruption

- cellular proliferation at the apex of the tooth
- localized change in blood pressure/ hydrostatic pressure
- metabolic activity within the PDL
- resorption of the overlying hard tissue

20

why does resorption of the overlying hard tissue occur

due to enzymes in the dental follicle

21

what does the dental follicle look like on a radiograph?

a dark halo round the unerupted tooth

22

what process is essential for the process of tooth eruption

remodelling
however, it is not necessary for the tooth to erupt to cause resorption of bone

23

what role does the dental follicle play in tooth eruption

is activated to initiate osteoclastic activity in the alveolar bone ahead of the tooth and clear a path for tooth eruption
(once crestal bone has been breached the follicle is likely to play a lesser role)

24

how does eruption occur

- occur gradually
- stops when the tooth comes into contact with something-usually the tooth of the opposing arch
- continues throughout life to compensate for vertical growth of the jaws and tooth wear

25

what is the order of eruption (general rules)

lowers before uppers except lateral incisors

central incisor, lateral incisor, first primary molar, canine, second primary molar

ABDCE
12435

26

what is the eruption dates for the lower central incisor

4-6 months

27

what is the eruption dates for the lateral incisors

7-16months

28

what is the eruption dates for the 1st molars

13-19 months

29

what is the eruption dates for the canine

16-22 months

30

what is the eruption dates for the 2nd molar

15-33 months