Facemask and Chin cup. Dr Abdul Jabbar. What are facemasks and chin cups? . Growth modification appliances for skeletal Class III. CLASS III MALOCCLUSION. The relative mesiodistal relation ship of arches are abnormal with all the lower teeth occluding mesial to
Dr Abdul Jabbar
Abnormal relationship in which
the mesiobuccal cusp of max. first
permanent molar occludes distal
to the buccal groove of mandibular
Pre Adolescents (late childhood , juvenile)
Adolescents (v. minimal effects)
2. CAMOFLOUGE (MILD)
3. Orthognathic SURGERY (moderate –severe)
DEFICIENT MAXILLA/COMPOSITE III
Expansion + face mask
8yrs age ideal for facemask
2. Petit facemask
Another advantage of maxillary expansion is the correction of the posterior crossbite that often accompanies a Class III malocclusion because of deficient transverse maxillary growth and the abnormal anteroposterior relationship of maxilla to mandible.
The facial mask is usually worn until a positive overjet of 2-4mm is achieved interincisally. At this time, part-time or nighttime wear is recommended for an additional three to-six-month retention
FR-3 Frankel appliance1 can be worn as an active retainer.
Types of chin cup
or surgical preparation.
Camoflouge of surgery
3. Growth sites and growth centers.
4. Drift , relocation, sub periosteal deposition and resorption, modelling,remodelling.
Skeletal Class III with
Reverse Twin Block ( appliances without lip pads)
1. Occipital Pull
2. Vertical Pull
150-300 gm per side (INITIALLY)
450-700 gm (if force is directed through condyle & slightly less if below the condyle)
14 hrs per day
After correction of cross bite wear only at night as retention appliance
CHIN CUP TYPE HEAD GEAR
2.VERTICAL PULLCHIN CUP
PULL CHIN CUP
If below the condyle-----downward &backward rotation of mandible
If no opening of mand. Plane is required forceshould be directed through condyle to help restrict mand. Growth.
OVER NEXT 2 MON.
Inc. ant. vertical dimention
Steep mand. Plane angle
If no Inc. in lower ant. Facial ht. is required
Soft chin cups Vs hard chin cups