HERBST Appl

Question 1

Which appliance keeps the mand continuously in protruded position… Both during rest n when jaws r closed??

Answer 1

HERBST

Question 2

Most powerful of all the MYOFUNCTIONAL appliances?? N considered GOLD STD for correction of class 2 SKELETAL…??

Answer 2

HERBST…

Question 3

Normalisation of occlusion takes how long for Herbst?

Answer 3

6-8 months

Question 4

Improvement in sagittal n vertical relation in Herbst is a result of?

Answer 4

Of both skeletal n dental changes…

Question 5

If PT cooperation is critical for class 2 correction… Which can’t be used .. n which is of choice..?

Answer 5

Activator n FR can’t be used here as they r REMOVABLE appliances… N for optimum results FULL TIME wearing is critical….

But Herbst is fixed type… So it doesn’t depend on pt cooperation… So can be used..

Question 6

Herbst… Cephalometric changes? N how?

Answer 6

Increase SNB… N decrease SNA…

Herbst will keep the mand in forward position continuously… So there will be remodelling of Retrodiscal tissue n glenoid fossa… These changes will keep the mand in SAGITALLY ADVANCED position ——–+ Point B will move forward…

It will also cause max molars to move distally n cause their intrusion…

Also… Move upper incisors BACKWARDS…. ———-+ Pt A will move backwards….

Question 7

Herbst… Mechanism??

Answer 7

Telescopic principle…

Question 8

Describe telescopic principle??

Answer 8

Herbst acts as an artificial joint between max n mand…

It exerts a posteriorly directed force on max n its dentition… N anteriorly directed force on mand n its dentition…
Mand arch length is increased due to stimulation of CONDYLE growth n remodelling to the ANT JUMPED POSITION of MAND…

Question 9

What’s used as a retainer after HERBST?

Answer 9

Activator

Question 10

Timing of HERBST… or any MYOFUNCTIONAL Appliance for that matter??

Answer 10

Peak of growth spurt

Question 11

Adv of Herbst…?? V. Obv

Answer 11

1. Is fixed ———+ no PT cooperation needed ..

2. Works 24 hrs a day…. ———+ Rx period is short…. 6 to 8 wks

Question 12

Disadvantages of Herbst?

Answer 12

1. Anchorage loss in both arches
2. Spacing in upper arch
3. Proclination of Lower ant…

Question 13

Denholtz appliance basics and uses??

Answer 13

Denholtz is a modification of Lip bumper…

Uses –

1. Regaining lost space in upper Arch
2. Distalization of upper molar (Asked!)
3. Prevention of Lip biting or sucking habit
4. Augmentation of encourage in upper arch

Question 14

Catalan’s plane…. Basics…

Answer 14

Catalan plane is only used when the crossbite is due to lingually positioned maxillary anteriors….

Angle is 45 to the occlusal plane…

Question 15

In Catalan’s plane what happens if the angle of the incline plane to occlusal plane exceeds more than 45 degree???

Answer 15

Extrusion of incisors…