The reality of face bow

First, let's try to think the purpose of facebow transfer what to be.

1. The reappearance of The Bonwill's triangle.

2. Reappearance on the Balkwill angle

3. The reappearance of the hinge opening and closing mouth movement axis

4. The reappearance of the opening and closing mouth way of the mandibular movement

5. The improvement of the reappearance of the mandibular movement

6. The prevention of the premature contact in the prosthesis

7.The establishment standard of the anterior guidance

8. The establishment standard of tooth shaft and overlap

The above thing can be reproduced by doing a facebow transfer.
For us clinician, the facebow transfer which can get much information like this at a time is an absolutely necessary method.
But, when the art-type is unreliable, for us, the work done all the way didn't only become useless, and you shouldn't have done it all the more.
Trust between the technicians is finally stopped with the dentist.
Then, it becomes a disappointing result.

Let's master the fundamental method of the facebow transfer here.

When a face bow was taken, it becomes a problem first

1. A model isn't suitable for the pressure scar of the cusp that a mark is written in the bite fork, and it is shaky.

It thinks about such a phenomenon.
Let's try to think about the impression of the crown and bridge here.
You do an impression taking twice a certain tooth.
Then, make a crown and bridge by each working model.
The crown and bridge made by the working model of "A" isn't usually included in the working model of "B".
Of course, the reverse is so, too.
But, the crown and bridge made by "B" conforms to the teeth neatly with the crown and bridge as well made by "A", too.
From the above explanation, one conclusion comes out here.

When a mark writes a cusp in the bite fork, do it on the model surely.

If it does so, it conforms certainly in the mouth.
So that you may operate a bite fork in the mouth,adaptation becomes improper on the model.
Well, the adaptation of the bite fork became OK. Let's do a face bow.
Then, the next problem comes out.

2. When a facebow transfer is done, a model turns and reaches.

There are these two causes.

1. The position of the ear is wrong.

2. It turns when a clutch is wrung.

The latter will be careful. Wring a clutch with holding it firmly with your left hand.
It is a problem when the position of the ear is wrong. This is thought in the considerable frequency.
However, it isn't afraid.
You have only to move it so that a bow may intersect vertically in the median-sadittal-plane.
It is OK in this when the face bow of the Slidematic type is used.
When a simple bow is used, a transfer can do that one more operation is done more securely.
It does marking in the middle of the bow, and it is to fit it to the median-sadittal-plane.
In the face bow of the Slidematic type,this operation can't be done.
Therefore, a median line sometimes deviates.
However, this is probably a limit of the face bow of the Slidematic type.

Only this! It is only this!!

Well, let's try it!!!

Click on "this" with the photograph and the explanation of the method of the face bow.