other functional appliences
Other Fu. Appliances Frankel Functional Corrector act through the principles of the activator and the oral screen.(FR.1: FR2: FR3: FR4) Components and there used
The action of the FR appliances:- 1-forward position of mandible. 2-vestibular pad. 3- labial pad.
Has acrylic shields in the buccal sulci Cause expansion of the arches by holding the cheeks awayFrankel appliance Palatal arch:- connect buccal shields U/L Labial bow:- retocline the incisors Cl II div1, Cl III Palatal arch to procline the incisors Cl II div2, Cl III
For class II is made to fit the jaws with the mandible in a forward postural position.FR3 THAT USED IN ACLASS III IS SIMILAR BUT THE ACTION ARE REVERSED
FR3 made to hold the mandible in retruded position. Worn almost full time except during eating due to that not interferences with the oral function
Other appliances *Bionator *Harvold *Twin Blocks *Herbst Appliance
*Bionator • It is a cut down activator • Less bulky than activator • Easily accepted by parents and patients than activators
Advantage of the Bionator 1-Less prone to breakage 2-Relative ease of fabrication 3-Relative ease in clinical handling 4-It could be used with simultaneous fixed appliance Tx 5-Not as effective with patients suffering from significant neuromuscular imbalance where FR-2 is indicated
Twin Blocks
Composed of removable MAX and MAND separates unattached plates that fit tightly against the teeth , alveolus and supporting structure. • Full time appliance (including during meal ) • Control of vertical dimensions
EFFECT OF TREATMENT • Increase in MAND length • Distalization of the MAX molars • Eruption of the MAND molars • Tipping of the anterior incisors : proclination - mandibular, retrusion - maxillary. • Increase in anterior and posterior facial height • Inhibition in MAX growth
The Herbst Appliance • Keeps the mandible continuously in a protruded position, both on jaw closure and when the teeth are not in occlusion • Cast metal skeleton splints were cemented to both upper and lower arches • Once placed by the operator, cannot be removed by the patient
Advantage of the Herbst – Fixed to the teeth and no co-operation from the patient is required – It works 24 hours a day – Treatment time usually short (about 6 to 8 months
Wax Bite • A proper wax bite must be provided • The mandible must be brought forward until the lower anterior are labial to the upper anterior by 1- 2 mm or edge to edge depending on the technique • Posterior separation of 6-7mm to open bite • Posterior separation 3-4mm to close or maintain bite
The following changes : 1- Dento-alevolar changes 2- Changes in the maxillary growth 3- Changes in the mandibular growth 4- Changes in neuromuscular anatomy and function 5- Changes in the glenoid fossa
1)Dentoalveolar Dentoalveolar – Retroclination of upper incisors – Proclination of lower incisors – Mesial eruption of lower posterior teeth
2) Restriction of forward growth of maxilla 3) Stimulation of mandibular growth beyond what is normally seen in growing children # Redirection of condylar growth from upward and forward directed growth to posterior direction
4) Changes in neuromuscular anatomy and function that would induce bone remodelling. 5) Adaptive changes to glenoid fossalocation to a more anterior and vertical direction.
Indications for functional appliances
6) Orthodontic Headgear
Face Mask