Gda Ortho 4

Front 1

Why is retention necesary?

Back 1

- PDL and gingival reorganization
- unstable tooth
- growth

Front 2

Periodontal Reorganizaiton

Back 2

-ortho tooth movement is mediated by pressure and tension in the PDL

-PDL widened so LD hasnt reorganized after treatment-->tooth mobile after

-PDL needs to reorganize after treatment-->3-4months and thus teeth need to be held in that position during reorg

Front 3

Gingival Reorganization

Back 3

-Gingival fibers stretched during treatment
-Collagenous fibers take 4-6 months to reorganize
-elastic supracrestal fibers take 1 year to reorganizae

-otherwise these fibers which are stretched, impose tension on teeth changing the position of the tooth

Front 4

Unstable tooth position

Back 4

-tooth positioned is maintained by equillibrium of pressure from the tongues, cheeks and lips

-unbalanced positions tend to lead to relapse
-stability of this pressure can be comproomised to align teeth

Front 5

Growth

Back 5

-original growth pattern that cause malocclusion continue
-treatment is done be adolescene but there maybe growth afterwards

Front 6

Life time retention

Back 6

-Mesial drift occurs through out life
"un treated individuals will experience incisor crowding"

-Entropy increases, gravity prevails
-treated individuals will return to original state

-poor growth patterns tend to persist

Front 7

Standrad retainer?

Back 7

Hawley
-Acrylic: lingual to prevent rotation
-Hawley bow: prevent rotation
-Clasp: hold it in place

Front 8

Wraparound retained for?

Back 8

-extraction cases or cases with initial spacing
-

Front 9

Retainer instructions

Back 9

-24 hrs a day for first 8-12 months
- 1 year for elastic superfibers to reorganize
-taper second year
-at least 1 night a week

Front 10

Removable appliances for tooth movement

Back 10

-spring for individual teeth
-active plates for arch expansion
-crozat for arch development

Front 11

Springs
-parts what are they for?
-indicated for?

Back 11

-retentive clasps
-acrylic frame work
-Springs
-light continuos force
-one point of contact
-tipping movement limited to 3-4mm

-use for when roots are inline and crowns need tipping

Front 12

Active Retainers for?

Back 12

-minor tooth crowding or relapse
-simple crown tipping(no root angulation)
-simple rotation

Front 13

T-spring for?

Back 13

tip teeth buccally

Front 14

Active plates
-parts?
-force?

Back 14

-clasps
-acrylic framework
-jackscrew
-heavy force w/ rapid decay
- .25mm / activation
-no more than 2 a week

Front 15

crozat
parts?
for?

Back 15

-retentive claps-1st molar
-metal framework
-body wire
-lingual extensions
-expand / increase transverse dimension

Front 16

Clear Aligners
material?
rigidiy?
flexibility?
type of force?
type of contact?
limitations?

Back 16

-trutain
-rigid enough to resist mild deforming forces
-flexible enough to provide light ortho force
-light intermittent
-multipoint contact

-cannot move roots, force level much lower than traditional ortho

-used only for tipping