primary tooth morphology Flashcards

1
Q

what early problems can occcur?

A

gingival cysts
congenital epulis
natal/neonatal teeth
eruption cysts

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2
Q

describe a gingival cyst

A

white
on gingivae
keratin

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3
Q

what should you do if you see a gingival cyst?

A

reassure parents
no tx needed
keep under observation

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4
Q

when should you treat congenital epulis?

A

only if large and interferes with feeding

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5
Q

describe natal/neonatal teeth

A
before/in first few weeks of life
primary central incisors
ectopic position=early eruption
can cause ulcer under tongue
no tx unless ulcer causing or if very mobile
root not formed
danger to airway
smooth down/may extract
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6
Q

what is an eruption cyst?

A

blue
overlying developing tooth about to erupt
filled with blood
resolves as tooth erupts

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7
Q

when do teeth start to form?

A

week 5 of IUL

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8
Q

when does hard tissue formation begin?

A

week 13 IUL

can be detected on ultrasound

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9
Q

describe the formation of the central incisors

A

start cal. 13-16 wk IUL
crown complete 1.5 months after birth
eruption 8-12 months
root complete 33 months

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10
Q

describe the formation of the second primary molar

A

hart tissue formation 16-23 wks IUL
crown formation complete at 11 months after birth
eruption 25-33 months
complete root formation 47 months

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11
Q

what can cause defects in enamel?

A

systemic disturbances during calcification - enamel formed at that time

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12
Q

what amount of each tooth is calcified at birth?

A
1/2 central incisors
1/3 lateral incisors
tip of canines
1/2 first primary molars
1/3 second molars
tip of cusps 1st permanent molars
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13
Q

what is the order of eruption?

A

lowers first except lateral incisors
ABDCE
12435

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14
Q

what is usually the first tooth to erupt?

A

lower central incisor 4-6months

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15
Q

when does the lateral incisor erupt?

A

7-12 months

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16
Q

when does the 1st molar erupt?

A

13-19 months

17
Q

when does the canine erupt?

A

16-22 months

18
Q

when does the 2nd molar erupt?

A

15-33 months

19
Q

what are the differences between primary and permanent teeth (crowns)

A

primary incisors smaller
primary molars wider mesiodistally than premolars
primary molar crowns more bulbous
primary teeth whiter

20
Q

what is an anatomical feature of the 1st molar?

A

prominent mesiobuccal tubercle

21
Q

how many buccal cusps are there in the 2nd primary molars

22
Q

what are the root differences between the primary and permanent teeth?

A

narrower
molars longer and more slender
flare apically

23
Q

describe the pulp differences between primary and permanent teeth

A

large in proportion to crowns
extend high occlusally
-closer to enamel

24
Q

describe primary root canals

A

ribbon shaped with multiple interconnecting and accessory canals

25
describe the difference in enamel
primary relatively thin and consistent depth
26
describe difference in dentine
coronal dentine much thinner than in permanent teeth
27
what is leeway space?
extra mesio-distal space occupied by primary molars which are wider than the premolars which will replace them
28
when does the mixed dentition stage occur?
begins from 1st permanent tooth erupts until exfoliation of last primary tooth usually 6-11 years
29
what is the eruption sequence of upper permanent teeth?
6,1,2,4,5,3,7,8
30
what is the eruption sequence of the lower permanent teeth?
6,1,2,3,4,5,7,8
31
why does transient spacing occur?
upper 1s due to close proximity of roots to 2&3's | self corrects after canines erupt