lecture 2 Flashcards
(22 cards)
when should interceptive ortho be done
when all four first molars are present and 8 incisors (permanent)
time frame for interceptive ortho
about 4 years to work
Interceptive orthodontics
- Treatments in the mixed dentition aimed at improving esthetics and function during active dentoalveolar development
- Space maintenance
- Eruption guidance
- Crossbite corrections
- No comprehensive treatment done at that time
Interceptive orthodontics
1. Timing
- Not a prolonged treatment!
- Start at the appropriate time
- Correct the issue and observe until comprehensive treatment can be initiated
*Space maintenance
can use appliances to maintain space in mixed arches ex; lingual arch
Interceptive treatment
*Correction of inclinations
*Limited bracketing can help in correcting poor inclination of incisors.
only done fr 6 months to a year
ways for minor tooth movement in adult
- Invisalign
- In house aligners
spacing goal
optomize it
occlusal plane goal
functional
is ortho tx only one discipline
no, interdisciplinary
*Molar uprighting
usually not minor tooth movement
Proffitt and Akerman improved?
Proffitt and Akerman improved the Angle
classification.
Three dimensions of space
* Anteroposterior
* Vertical
* Transverse
Time: Growth or aging= 4th plane
First Dimension: Anteroposterior (sagittal)
*Follow angle’s principles
* Classification of the molar relationship
* “Classify the canine relationship”, between man C and PM1= class 1
First Dimension: Anteroposterior (sagittal) measurement
*Overjet:
* Etiologies
* Skeletal: Involve one or 2 jaws
* Dentoalveolar ( dental): Involve upper and or lower incisors
* Positive overjet
* Negative overjet
* measured from labial to labial
overjet scale
*0mm : End to end occlusion
*2mm : Normal overjet
*4mm : Light overjet
*6mm : Moderate overjet
*8mm : Severe overjet
*10mm: Excessive overjet
*Reverse overjet
Second Dimension: Vertical Dimension measurement
Overbite
0% 10% 25% 50% 75% 100%
Amount of coverage of the lower incisor crown by
the upper incisor in maximum interdigitation
(percentage)
ideally 20%
most important factor of overjet
etiology, easier to tx dentoalveolar issues
most dif/unpredictable dimension
vertical
Third Dimension: Transverse
Dimension
*Width of the arch
*Arch form
*According to Proffit,30% of adult patients present with a transverse discrepancy
Arch width and form
Widths
*Normal
*Narrow
*Wide
Forms
*Tapered,
*“Normal”,
*Square
is arch size or shape more important
shape
how many planes do malocclusions exist in?
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