Development of the Primary and permanent dentition Part I Flashcards

1
Q

how many teeth are there in the deciduous dentition

A

20 teeth

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2
Q

first molars erupt ______ to the primary dentition

A

distal

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3
Q

what age do the permanent teeth erupt

A

6-13 years old

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4
Q

how many teeth are in the permanent dentition

A

32

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5
Q

what is the eruption pattern of the mandibular arch

A
  • central incisor: 6-10 months
  • lateral incisor: 10-16 months
  • first molar: 14-18 months
  • canine: 17-23 months
  • second molar: 23-31 months
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6
Q

what is the exfoliation pattern of the mandibular arch

A
  • central incisor: 6-7 years
  • lateral incisor: 7-8 years
  • first molar: 9-11 years
  • canine: 9-12 years
  • second molar 10-12 years
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7
Q

what is the emergence pattern of the maxillary arch

A
  • central incisor: 8-12 months
  • lateral incisor: 9-12 months
  • first molar: 13-19 months
  • canine: 16-22 months
  • second molar: 25-33 months
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8
Q

what is the exfoliation pattern of the maxillary arch

A
  • central incisor: 6-7 years
  • lateral incisor: 7-8 years
  • first molar: 9-11 years
  • canine: 10-12 years
  • second molar: 10-12 years
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9
Q

where are primate spaces found

A

mesial to upper cuspids and distal to lower cuspids

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10
Q

what is the probability that if there is no interdental spacing in the deciduous dentition that there will be crowding in the permanent dentition

A

75%

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11
Q

_____ between anterior primary teeth are important to get space for permanent incisor eruption

A

diastemas

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12
Q

the upper incisors erupt _____ of primary teeth

A

labial

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13
Q

the lower incisors erupt ______ of the primary teeth

A

lingual

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14
Q

there is ________ in arch size after the eruption of the permanent incisors

A

no significant increase

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15
Q

are the primary incisors angled

A

no

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16
Q

the crown shapes are _____

A

symmetrical

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17
Q

anterior teeth are _____ than permanent teeth

18
Q

some primary posterior teeth are _____ than their successor

19
Q

how big is the upper second premolar

20
Q

how big is the upper second primary molar

21
Q

how big is the lower second premoalr

22
Q

how big is the lower second primary molar

23
Q

what is the occlusal plane

A

an imaginary surface that passes through the occlusion of the teeth

24
Q

describe the occlusal plane

A

usually curved and is not a plan but approximated by a straight line in the lateral view based on specific reference points within the dental arches

25
where does the maxillary occlusal plane pass thorugh
the occlusal cups of the posterior teeth and the incisal edges of the maxillary incisors
26
where does the mandibular occlusal plane pass through
tangent to the occlusal cusps of the posterior teeth and the incisal edges of the mandibular incisors
27
primary teeth are positioned ____ _to the occlusal plane
90 degrees
28
are permanent teeth positioned 90 degrees to the occlusal plane
no
29
what part of the permanent tooth pushes out the primary tooth
the follicle
30
what is the curve of spee
the curve displayed in the sagittal plane (parallel with the body of the mandible) by the cusps and incisal edges of the mandibular teeth. the convex aspect of the curve of spee is pointing inferiorly
31
at what age is the intercanine width of the mandible established
8-9 years old
32
who developed the curve of spee and what was their original idea
F. Graf Von Spee in 1890 - theorized that the extension of this curve would be tangent to the anterior surface of the mandibular condyles bilaterally
33
in the primary dentition the curve of spee is:
flat
34
if a malocclusion is diagnoses in the primary dentition it will probably:
get worse during growth
35
what are the occlusal relations in the deciduous dentition
- upper and lower incisors are vertical - minimal overbite and overjet - upper canine tip is positioned in the embrasure between the lower canine and the first primary molar
36
what is overjet
the distance between the labial surface of the mandibular incisors and the labial aspect of the incisal edge of the maxillary incisors usually measured parallel to the occlusal plane
37
when not otherwise specified the term "overjet" is assumed to refer to:
the most prominent central incisors
38
the extend of the overjet is determined primarily by:
the differences of labiolingual position and inclination of the maxillary and mandibular central incisors
39
how often is the anteroposterior skeletal relationship reflected directly in the amount of overjet
only in a minority of cases
40
the first primary tooth appears around the age of_____ and by ______ all primary teeth should be present.
8 months, 30 months
41