Activator

Question 1

C/I of Activator–??

Answer 1

1. ADULTS (Obvly)
2. Non cooperative pts

Now the next always Rm together!

3. Vertically growing PT
4. Lower anterior proclamation
5. Lower ant crowding severe…

Question 2

Disadv of Activator–?

Answer 2

1. Can’t be used in cases of skeletal Maxillary protrusion… (MI)
2. Doesn’t provide a good finishing n polishing of malcclusion
3. Leads to forward n downward rotation of mand…. ———+ Lower facial height Increased!!
4. God PT cooperation needed

Question 3

Syns of Activator–??

Answer 3

Monobloc - by Pierre Robin

Verbissplate - Holtz

Anterior inclined plate - Kingsley

Biomechanical working retainer activator - Viggo Andersen

It’s also called functional jaw orthopedics

Question 4

How does Activator actually act? (There are basically 3 mechanisms)

Answer 4

1. Changes the pattern of closure of mandible…! When the pt wears it… N then while biting down or closing the mouth, he is forced/made to bring the mandible forward ——-+ thus this process leads to stretching the ligaments n soft tissues of TMJ (Retrodiscal tissue)… ——+ their proliferation ———-+ forward growth of mand. ( + Glenoid fossa remodelling )…
2. Selective trimming of the bite block!!

To correct class 2... Disto Occlusal of the block in the MAXILLARY post region is trimmed .. so that the Max post would move DISTO-OCCLUSALLY... AND...
MESIO - BUCCAL of the block in the post region of Mand molars is trimmed... So that mand molars would MESIO-BUCCALLY...

Question 5

Describe the labial bow for activator??

Answer 5

1. Active Labial bow –

Contacts teeth n exerts pressure on teeth…

2. Passive…. –

Doesn’t contact teeth… Influences soft tissues.

Question 6

The gauge of active n passive labial bows of activator?

Answer 6

Active - 0.9 mm

Passive - 0.8 mm

**Somewhere else given ULTA!! So check..!

Question 7

Whether Activator is tooth borne or tissue borne?? Bulkier or not (than bionator)?? Loose fitting n passive or not?

Answer 7

Activator is…

Bulky. Loose fitting n passive… Tooth borne…

Question 8

Who gave the term monobloc??

Answer 8

Sauver

Question 9

Activator can be considered an active retainer when??

Answer 9

When OCCLUSAL Correction needed is less than 3 mm…. Active Labial bow is used n activator called Active retainer…

When OCCLUSAL Correction needed is more than 3 mm… Passive labial bow is used… It doesn’t contact teeth… It changes the pattern of mandibular closure… Thus induces myotactic reflex by stretching the TMJ n contraction of muscles… This MUSCLE FORCE moves The TEETH!!!! (Alw Rm this!!)

Question 10

Describe Pterygoid response….??

Answer 10

It’s typically seen in TWIN BLOCK…

The placement of the appliance results immediate change in neuromuscular proprioceptive response… Within a few days of wearing .. the muscle balance is so greatly altered that the pt experiences pain while retracting the mandible…

Question 11

Pterygoid response in seen after?

Answer 11

6 to 8 wks

Question 12

Which modification of ACTIVATOR is used for Class 3 correction?

Answer 12

Wunderers…

How?
Here there is a screw in the upper portion of the Acrylic plate… It brings the maxilla more forwards ( in a more sagittal direction)… While the LOWER acrylic plate holds the lower arch n restricts its development in the sagittal direction…