Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ortho > space analysis and its interpretation > Flashcards

space analysis and its interpretation Flashcards

1
Q

how to determine if there is enough room for succideneous teeth in mixed detention

A

measure space within the arches after the permanent incisors and first molars have erupted
- compare to space needed to align unerrupted permanent teeth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is the space available

A

Distance the arch circumference rom the mesial of 1 permanent first molar to the mesial of the other 1 permanent first molar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

how to determine space available

A

strait line segments

  • 2 lateral from mesial of 1st molar to alveolar process in canine
  • 2 anterior from canine region to midline
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is the space required

A

the sum of the width of incisors that have erupted plus the width of the canines and premolars that have not erupted

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

how to measure for space required

A

incisors directly from dental casts

  • measure unerupted on radiographs
  • correlate width of erupted lower incisors
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what type of radiograph should be used for estimating teeth size

A

periapical

not panoramic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

how accurate is measuring magnification by comparing to a known tooth size

A

fair to good, depending on quality

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

pros and cons of measuring magnification by comparing to a known tooth size

A

useful for all ethnic groups

extra-radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

how good is the correlationg between size of permanent lower incosor to unerupted canines and premolars

A

Good

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what method for estimating tooth size uses proportionality tables

A

Moyers prediction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

how to use the moyers method

A

Mesiodistal width of lower incisors are measured

- use table to predict both upper and lower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

quality of the Tanaka-johnston prediction

A

good accuracy with small bias toward overestimating the unerupted tooth sizes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what does the Tanaka-john prediction predict

A

the size of the unerupted canines and premolars using the lower incisors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

how to do the tanaka johnson prediction

A

uses two formulas from the mesiodistal width of the lower incors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what are the formulas for mandible canine and premolars in one quad

A

1/2MD width of 4 lower incors+10.5mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what are the formulas for he maxillary canine and premolars in one quad

A

1/2 MD width of 4 lower incisors+11mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what is the problem os using radiographic images

A

Getting a good canine view

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what is the Hixon-oldfather prediction

A

combination of radiographic and proportionality table

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what is done in the Hixon-oldfather prediction

A

size of permanent incisors measured from the dnetal casts and size of premolars measure from periapical radiographs to predict size of unerupted canines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what demographic does the Hixon-oldfather prediction show

A

norther europe

- not good for african or asia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

problems with the Hixon-oldfather prediction

A

mandiular arch only

Needs periapical radiographs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

what is the most practical way to do space analysis

A

Tanaka and Johnston method

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

why is the Tanaka_johnston prefered

A

No radiographs
No lengthy prediction tables, graphs or equations
Both arches
Reasonable prediction

24
Q

what to consider when using Tanaka-Johnston method

A

The ethnicity of the children(caucasian was used to measure

25
Q

what is the assumption of the Tanaka-Johnston

A
  • corrrelation between size of erupted mandibular incisors and size of remaining unerupted max and mandibular canine
  • patient must fit the caucasion population
  • teeth are developing normally
26
Q

what are the most variable teeth appart from 3rd molars

A

max lateral incisors

Mad second premolars

27
Q

how to adust predictions if from a different population

A
  • recongize limitation
  • different table/formula for racial group
  • use individualized periapical radiographs
28
Q

what are some of the last teeth to show up

A

premolars

- may not be sure on the size

29
Q

what does space analysis assume

A
  • Arch dimensions do not increase during growth
  • possition of the incisors will not change in a way that increases or decreases circumference and available space
  • the mesial shift of 1st molars can be predicted accurately, at least with Class I
30
Q

what classification tends to have the best space analysis

A

Class I

31
Q

when can arch circumference and incisor stability be assumed

A

after the eruption of lateral incisors

32
Q

why does class II cause problems with space analysis

A
  • lower incisors tend to tip facially, increasing sapce in the lower arch
  • upper incisor moves facial or lingual
33
Q

why does class II cause problems with space analysis

A

lower incisors tip lingually, decreaseing space in the lower arch
- upper incisors move facial, increasing space

34
Q

what is used to measure teeth

A

Boley gauge, sharpened to get interproximal

35
Q

how acccurate should measurements be

A

down to the 10th millimeter

36
Q

how to calc mandiular arch length

A

measure cont arch length over the contacts of the mandibular teeth between mesial of permanent 1st molar on the right to the left

37
Q

what does section one measure

A

Space analysis (mandible)

38
Q

what does section 2 measure

A

mesiodistal width of the lower incisors

39
Q

what does section 3 measure

A

calc the maxillary arch length

40
Q

what does section 4 measure

A

mesiodistal maxillary incisor width

41
Q

what does section 5 measure

A

mandibuar space available

42
Q

what is found in section 6

A

maxillary space available

43
Q

what is included in section7-10

A

determine skeletal status of patient

determine if mesial molar shift can occurs

44
Q

why determine skeltetla status of patient

A

mandibular incisors stabilit and space implication

45
Q

where do you get the info for section 7

A

facial profile analysis on the reverse side of space analysis form

46
Q

what does a jaw relationship of Class I and Class II molar relatoinship mean

A

maxilary space loss/shortage

47
Q

what tooth is good for previous dental relationships, even when posterior teeth have drifted

A

Canine

48
Q

what does a class III molar relationship with a class I skeletal pattern mean

A

mandibular space loss/shortage

49
Q

when should you complete section 9

A

when a patient has a class I skeletal relationship and 1 or both molars in an end-to-end relationship or not quite class I

50
Q

when can a class I molar releationship be achieved with a class I skeletal relationship with an end to end molar relatoinship

A
  • shift mandibular 1st permanent molar mesially into leeway space
  • more mand than maxillary growth
  • combo
51
Q

what is the leeway space

A

Difference in total width of primary molars and canine, compared to combine width of permant teeth that are replaced

52
Q

what happens to arch lengthin the late mixed dentition

A

arch length decreases

53
Q

how to determine shortening of available space due to mesial shift

A

draw vertical line at the mesiobuccal cuspt tip of permanent max first molar
another line in buccal groove of permanet mandibular first molar
= distance between 2 space required to achieve class I occlusion

54
Q

what is shown in class I

A

lip posture of the patient

55
Q

how to determine if protrusive or retrusive lips

A

Protrusive: infront of nose-chin line
Retrusive: behind nose-chin line

56
Q

how do you account for the change in first permanent molar position that may occur during trasition to the permanent dentition

A

measure distance the lower molar would have to move to go to class I

ortho (22 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions