facebow registration

Question 1

What are the conents of facebow ?

Answer 1

• Bite fork
• transfer jig assembly
• Earbow
• Reference plane locator

Question 2

How to record a facebow registration?

Answer 2

• mark the anterior reference point on the right side using the reference plane locator and marker
• Apply the bite registration paste to the bitefork (check it is parallel to the patient horizontal and coronal planes)
• The bitefork should be aligned with the dental midline
• Assemble the earbow and the transfer jig

Question 3

How would you put the position in the pointer?

Answer 3

• it should align precisely with the anterior reference point
  after that tighten the clamps

Question 4

Where is the anterior reference point?

Answer 4

• on the patient right side 43mm apical to the incisal edge of the anterior teeth (12 ideally)
• it is approximately the location of the infraorbital foramen

Question 5

What are you recording with the facebow ?

Answer 5

• the relationship of the maxilla to the hinge axis of rotation of the mandible to mount the maxillary cast in an equivalent relationship on the articulator

Question 6

How to mount the lower to the upper?

Answer 6

Using a registration paste on the lowers

Question 7

Why are you using facebow in this case?

Answer 7

I used the face bow registration in RCP to get the patieint occlusion reproducible on a cast
- because we are constructing several indirect restorations
- and restoring the canine guidance which will slightly increase the OVD
- also to keep up with the patient high aesthetic demands by doing the composite buildups precisely by a vacuum stent
- also the canines debonded on several occasions and the face-bow will allow us to examine the occlusion
- to ensure that restorations made are comfortable with patient mandibular movements

Question 8

How would you take the impression in RCP ? (interocclusal)

Answer 8

• the patient is guided into a terminal hinge closure to detect where initial tooth contact occurs(RCP)
• this is bimanual manipulation or by chin point guidance (guiding the patient chin)
• the RCP record is taken at a slightly increased OVD, just before initial tooth contact

Question 9

What is the position of the mandible before the first tooth contact?

Answer 9

• the mandible is rotating about its terminal hinge axis

Question 10

With what are you taking the impression?

Answer 10

• with records block vecause we have free-end saddles

Question 11

What is RCP?

Answer 11

When the mandible closes in the terminal hinge axis position(first tooth contact)

Question 12

What is the relationship between RCP and ICP?

Answer 12

• The RCP is usually infero-posterior to ICP by 0.5-2mm

Question 13

Why restore canine guidance?

Answer 13

• because veneers keep coming off because the patient is in group function which contribute to her toothwear on the lower anteriors , she also does not know how to guide her bite

Question 14

Why are you achieving by the canine guidance?

Answer 14

-To produce a mutually protected occlusion
- it will lead to stability while chewing
- smoother mandibular movements

Question 15

What is the function of clamp number 1 on facebow?

Answer 15

• it used to adjust the facebow vertically

Question 16

What is clamp number 2 function?

Answer 16

• it is used to adjust the facebow horizontally

Question 17

What is he function of the transfer jig?

Answer 17

fixes the bite fork to the articulator so the casts can be mounted