Functional Appliances Flashcards
Diffrent types of functional applinces are there?
Fixed:
Tooth borne: - Herbst
- COFF
Removable:
Tooth borne - twin blocks
- MOA
Tissue borne - Frankel functional regulater
Tooth and tissue borne - Bionater
Functional appliances - mode of action?
Dento alveolar changes 70%
- retrocline maxilary incisors
- Procline kand incisors
- Distal movement of the uppers
- Mesial movement of lowers
Skeletal changes 30%.
- downwrds and forwards translation of the condyle
- encourange growth of mandible backwords
- forwards remodelling of the glenoid fossa
Incresed LAFH
- passive molar eruption
-
Twin Blocks general info
Most pouplar functional Well tolarettaed by patints Removable 2 pieces Can be modified to correct AP Vertical and transverse: MES, Z spung, active labial bow, acrylic covarage lower incisors. Must be worn full time
Twin blocks - effects
Posterior OB
Posterior teeth can erupt if acrylic is removed to correct deep bites
Advantages and disadvantages of TB’s?
Imediat improvement in aparance Well tolaretaed by patients ( 2pieces) Can be modified Easy to adjust and activate Removable easy to clean If worn wirks fast
Pt need lots of encouragement Removable - needs patinets compliance Difficult to wear at the start Affects speach Results in post ob LAFH is increased ( disadv for pt that already have LAFH incresed)
Herbst how does it work?
2 sections - 1 attaches to the upper buccalteeth and one to the lowe buccal teeth
The 2 sections are joined by a rigid arm that is activated , this postures mandible forwards
Herbst Advantages and disatvantages?
Fiexed - dosen t require compliance
Well tolatmrated
Good for aesthetic
Easy to talk and eat
Incresed brakages
High cost
Fifficult to fit and repair
MOA- how does it work?
One piece
Minimal acrylic
No molar capping allows posetrior molar eruption ( works well in Open bite)
Upper and lowr parts are joined together by acrylic
Between the acrylic parts is an anterios breathing hole
