35. Frankel appliance Flashcards
(16 cards)
Frankel functional regulator characteristics
- Tissue borne passive functional appliance
- Myodynamic and myotonic action
Frankel regulator indications
- Class I w/ mandibular anterior teeth retroclination
- Class II div 1 w/ severe overjet
- Class II div 2 w/ maxillary constriction
- Class III w/ mandibular anterior teeth proclination
- Open bite
Frankel regulator types
- Type I- Functional regulator(Class I and mild Class II)
- Type II- Class II div 1 and 2
- Type III- Classs III
- Type IV- Anterior open bite and bimaxillary proclination
- Type V- W/ headgear
Frankel regulator parts of appliance
- Acrylic base-Buccal shield, lingual shield, acrylic pads
- Labial bow
- Lingual support wire
- Palatal support wire
- Labial support wire
- Canine extension loop
Frankel working bite registration
- Sagittal plane- mandible advanced to Class I
- Vertical plane- Enough vertical opening(2.5-3mm) for cross over wires to pass through interocclusal area
- Sagittal plane- midlines aligned
Fabrication technique for Frankel appliance
- Requires very precise impressions
- Well imprinted vestibular sulcus in labial and buccal area
- Frenula of lips and tongue
- Bucco-gingival frenula and sublingual area
Frankel regulator acrylic base components
- Two labial pads
- Two buccal shields
- One lingual shield
Frankel regulator buccal shields
- 2mm thickness
- Borders:- vertically-deep into vestibular sulcus of maxilla and mandible
- Anterior-to mesial surface of first permanent premolar or primary molar in maxilla or mandible
- Posterior-To distal surface of maxillary and mandibular first molar
Acrylic base of frankel I and II
- Wax layer added=>
- Relief between acrylic parts and dentoalveolar region
- Thickness=>3mm in area of teeth and 2.5mm in vestibular sulcus
Wax relief done with care to ensure correct adjustment of apppliance and expansion of ridge
Acrylic base in Frankel III
- In mandible-fits tightly on alveolar ridge buccally
- Wax relief only to upper model in ridge area
- Interocclusal acrylic
Design blocks unfavourable mandibular growth
Acrylic base of frankel IV
- Buccal shields acrylic base same as frankel I and II
- Interocclusal acrylic designed individually taking into account their form and location
- They should avoid interfering with distal translation of mandible and additional bite opening
Interdental embrassures and rests of buccal shields have to be avoided
Acrylic base of Frankel V
- Buccal shields have molar tubes in maxillary molar area=>
- Insertion of inner bow of headgear appliance
Lingual shield of frankel
- Present in Frankel I and II
- In sublingual area and on lingual surfaces of mandibular teeth
- Extends from left to right second premolars(primary second molars)
- Holds mandible in mesial position
- Retentive inflections of lingual bow and springs connecting wires embedded in acrylic of shield
Acrylic pads position on Frankel
- On lateral sides of upper and lower labial frenuli
- 6mm apical of cervices of central incisors
- Deep in vestibular sulcus
- Oval shape and thickness of 2mm
- Stimulate apical base development
In mandible in Frankel I, II, IV and V, Maxilla in Frankel III
Wire elements of frankel
- Maxillary labial bow
- Canine extension (canine loop)
- Lingual, palatial support wires
- Support wires for labial pads
Labial bow of Frankel regulator
- 9mm round stainless steel wire
- In maxilla in Frankel I, II, IV and V, mandible in III
- Starts from buccal sheilds w/rententive inflections, half loops and crosses incisors at midpoints
Loop portion must be 2mm away from tissue above canines-important when permanent canines erupting as may be hit if bends incorrect
