space analysis and its interpretation Flashcards by Jacob Amato

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

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

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what is the space available

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

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how to determine space available

strait line segments

2 lateral from mesial of 1st molar to alveolar process in canine
2 anterior from canine region to midline

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what is the space required

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

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how to measure for space required

incisors directly from dental casts

measure unerupted on radiographs
correlate width of erupted lower incisors

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what type of radiograph should be used for estimating teeth size

periapical

not panoramic

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

fair to good, depending on quality

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

useful for all ethnic groups

extra-radiation

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

Good

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what method for estimating tooth size uses proportionality tables

Moyers prediction

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how to use the moyers method

Mesiodistal width of lower incisors are measured

- use table to predict both upper and lower

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quality of the Tanaka-johnston prediction

good accuracy with small bias toward overestimating the unerupted tooth sizes

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what does the Tanaka-john prediction predict

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

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how to do the tanaka johnson prediction

uses two formulas from the mesiodistal width of the lower incors

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

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

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

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

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what is the problem os using radiographic images

Getting a good canine view

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what is the Hixon-oldfather prediction

combination of radiographic and proportionality table

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what is done in the Hixon-oldfather prediction

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

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what demographic does the Hixon-oldfather prediction show

norther europe

- not good for african or asia

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problems with the Hixon-oldfather prediction

mandiular arch only

Needs periapical radiographs

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what is the most practical way to do space analysis

Tanaka and Johnston method

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why is the Tanaka_johnston prefered

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

what to consider when using Tanaka-Johnston method

The ethnicity of the children(caucasian was used to measure

what is the assumption of the Tanaka-Johnston

- 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

what are the most variable teeth appart from 3rd molars

max lateral incisors | Mad second premolars

how to adust predictions if from a different population

- recongize limitation - different table/formula for racial group - use individualized periapical radiographs

what are some of the last teeth to show up

premolars | - may not be sure on the size

what does space analysis assume

- 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

what classification tends to have the best space analysis

Class I

when can arch circumference and incisor stability be assumed

after the eruption of lateral incisors

why does class II cause problems with space analysis

- lower incisors tend to tip facially, increasing sapce in the lower arch - upper incisor moves facial or lingual

why does class II cause problems with space analysis

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

what is used to measure teeth

Boley gauge, sharpened to get interproximal

how acccurate should measurements be

down to the 10th millimeter

how to calc mandiular arch length

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

what does section one measure

Space analysis (mandible)

what does section 2 measure

mesiodistal width of the lower incisors

what does section 3 measure

calc the maxillary arch length

what does section 4 measure

mesiodistal maxillary incisor width

what does section 5 measure

mandibuar space available

what is found in section 6

maxillary space available

what is included in section7-10

determine skeletal status of patient | determine if mesial molar shift can occurs

why determine skeltetla status of patient

mandibular incisors stabilit and space implication

where do you get the info for section 7

facial profile analysis on the reverse side of space analysis form

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

maxilary space loss/shortage

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

Canine

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

mandibular space loss/shortage

when should you complete section 9

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

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

- shift mandibular 1st permanent molar mesially into leeway space - more mand than maxillary growth - combo

what is the leeway space

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

what happens to arch lengthin the late mixed dentition

arch length decreases

how to determine shortening of available space due to mesial shift

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

what is shown in class I

lip posture of the patient

how to determine if protrusive or retrusive lips

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

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

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