Tutorial 6 - Definitive Jaw Registration

Question 1

If you are making an acrylic denture you will carry out this stage using?

Answer 1

• wax or acrylic base plate + occlusal wax rims
• base plate is wire reinforced
• preferably acrylic base plate

Question 2

Why would acrylic base plate be preferred to wax base plate for an acrylic denture?

Answer 2

• as it’s more durable, robust, harder
• Can test retention with it
• Can assess undercuts (wax is forgiving so can go into undercuts but acrylic is not)

Question 3

If you are making a cobalt chromium denture you will carry out this stage using?

Answer 3

you will have your metal framework with wax occlusal rims attached

Question 4

Why do we do this defintive jaw reg stage?

Answer 4

Question 5

Answer 5

• Record the shade and the mould of tooth you wish used

EXTRA IMPORTANT - steps same as prelim jaw reg
- need to adjust upper + lower wax occlusal rims
- record patient’s occlusion

• For the definitive jaw reg we adjust the upper + lower wax rims separately to the correct occlusal plane
• If upper FES: foxes occlusal guide plane is used to check the occlusal plane to be parallel to the eye level and ala tragal line
• If lower FES: check the occlusal rim in relation to the lingual aspect of the tongue + retromolar pads
• If anterior teeth missing: need to mark centre line, canine line + smile lines of upper rim

Question 6

How should you record the shade?

Answer 6

• match it to patients teeth + use a shade guide

TIPS
- ask the patient as well (may want to go for a lighter shade)
- you give them guidance but it’s their choice (bring nurse to help)
- shade match under diff light settings
- Use shade guide from same company you’ll use for the teeth

• often describe teeth as being square, oval or slightly tapered
• male usu more square
• female usu oval or tapered slightly

Question 7

What should you do before inserting the preliminary jaw reg denture (that has come from the lab) in patients mouth?

Answer 7

• place in a perform bath for 10 minutes to disinfect
  (All lab work should be disinfected)

Question 8

Answer 8

• need to put date of work required

TIP
- remember to disinfect anything placed in patient mouth in perform bath before sending off)
(Not yet processing denture)