Occlusion for conventional dentures

Question 1

What are the jaw registration steps?

Answer 1

1 - Adjust upper record block for retention
2 - Adjust upper record block for tooth position
3 - Adjust upper record block for occlusal planes
4 - Lower tooth position and horizontal jaw relationship
5 - Measure vertical dimension and establish face height
6 - Record registration
7 - Select shade, mould and setting

Question 2

What is the acronym when adjusting record blocks?

Answer 2

L - Lip support
I - Incisal level
M - Midline
B - Buccal corridor
O - Occlusal plane

Question 3

When checking lip support what should you check?

Answer 3

• Recommended nasiolabial angle is 90°
• Actual in edentulous patients in 96°
• Use Alma gauge for checking tooth position

Question 4

When checking incisal level what should you check>

Answer 4

• Use visual judgement or pics of natural teeth
• Lip level
• Lip during speech
• Age
• 1-2mm of show
• Mark on lip line and canine line and midline

Question 5

How to check occlusal plane in upper record blocks?

Answer 5

• Use interpupillary line for anterior
• ## Use ala-tragus line for posterior (parallel)

Question 6

What is the neutral zone?

Answer 6

• Potential space between lips and cheeks on one side and tongue on other
• Area where the forces between tongue and cheek are equal

Question 7

What is the muscular position?

Answer 7

• Position of closure produced by balanced muscle activity raising mandible from rest to initial contact

Question 8

What is occlusal vertical dimension?

Answer 8

• Distance between set point on maxilla an set point on mandible when denture or natural teeth in maximum intercuspation
• OVD

Question 9

What is resting vertical dimension?

Answer 9

• RVD
• When mandible is at rest with patient upright

Question 10

What does excessive freeway space give?

Answer 10

• reduced masticatory efficiency
• Overclosed facial appearance
• Cheek biting
• TMJ symptoms

Question 11

What does reduced (inadequate) freeway space give?

Answer 11

• Excessive load on denture bearing area
• Continuous muscular activity result in pain
• Aesthetic complaints like teeth too big

Question 12

What is aim mm for freeway space and how can you get this?

Answer 12

• Use willis bite gauge
• 2-4mm

Question 13

How do you record the registration?

Answer 13

• Cut notches on upper and lower blocks
• Use wax or jaw reg paste
• If using jaw reg use adhesive to upper and lower blocks and paste to lower
• Ensure seat back on model