Jaw Registration Flashcards
What equipment do you need for jaw registration?
Record blocks on articulated casts
Bunsen burner or hot air burner
Pros kit- lecron carver, mirror, probe, wax knife.
Pallet knife
Willis bite gauge or dividers
Pencil
Foxes bite plane
Registration paste
Shade guide and mould guide
Describe the steps of a jaw reg.
Adjust upper block for retention
- Over-extended areas, buccal and labial aspects might need to be reduced.
Adjust upper block for tooth position- LIMBO
Adjust upper block for occlusal planes
Lower tooth position and horizontal jaw relationship
- Teeth in the neutral zone
- Teeth in RCP
Measure vertical dimension and establish face height
Record registration
Select shade, mould and setting
What does LIMBO stand for?
Lip support- should be 90-100 degrees for naso-labial angle.
Incisal level- visual assessment and mark on the blocks the smile line, canine lines.
Midline- dental midline coincides with the facial midline.
Buccal corridor
Occlusal plane
- Anterior- interpupillary line
- Posterior- Ala-tragus line
What is the neutral zone?
Potential space between the lips and cheeks on one side and the tongue on the other, that area or position where the forces between the tongue and cheeks or lips are equal.
Teeth should be set within the neutral zone.
- if not, they will be dislodged by the check or tongue.
If you cannot get a patient into RCP, what other position could you use?
Muscular position
- Position of closure produced by balanced muscle activity raising the mandible from rest to initial contact.
How do you measure OVD, RVD and freeway space?
Willis Bite Gauge or dividers.
What are the final checks before recording the registration?
Are the books trimmed so teeth will be in the neutral zone?
Do you have even contact with upper block?
Is OVD correct for patient, with adequate FWS?
Is centre line correct?
Are occlusal planes appropriate?
How do you record the registration?
Cut relocation notches in the blocks and record using wax or bite reg paste (PVS).
