Pros clinic/ tutorial

Question 1

What is the problem with the denture when the patient’s “s” sound is too long?

Answer 1

No FWS

Question 2

Why would a patient have pain but no trauma/ ulcer?

Answer 2

Problem with SUPPORT.
Check support areas

Question 3

Why does a denture fall down when eating?

Answer 3

Abnormal occlusal contacts, tipping the denture and breaking the peripheral seal

Question 4

What is COMBINATION SYNDROME?

Answer 4

Associated with FLABBY RIDGE
Generally when there is an edentulous maxilla and they only have lower 3-3 (anterior) teeth.
All the biting force is on the upper 3-3 ridge, so the bone resorbs and mucosa thickens, resulting in a flabby ridge.

Question 4

Where do lower teeth sit 90% of the time in dentures and why do they sit here?

Answer 4

ON THE RIDGE
Because that is where the teeth were before - mandible resorbs DOWNWARDS.

Question 5

Where do teeth sit in relation to alveolar ridge in maxillary dentures?

Answer 5

BUCCAL to alveolar ridge in order to keep in contact with mandibular teeth
*NOTE - maxilla resorbs upwards and inwards

Question 6

When do you use ICP?

Answer 6

When there is enough index teeth for inter-digitation

Question 7

What is the minimum distance between clasp arm and gingival margin?

Answer 7

1-2mm

Question 8

What percentage of clasp arm must engage undercut to be effective?

Answer 8

1/3

Question 9

What does the other percentage of the clasp arm that DOES NOT ENGAGE in the undercut do?

Answer 9

Provides BRACING

Question 10

What is a RE-BASE?

Answer 10

Changing ALL of the acrylic in the denture - NOT JUST THE FITTING SURFACE
Remove ALL acrylic EXCEPT the acrylic under the horse-shoe of teeth. Need to take new primary impression.

Question 11

How do clinically check RETENTION of dentures?

Answer 11

Fingers on premolars and tug downwards

Question 12

How do you clinically check STABILITY of dentures?

Answer 12

Fingers on premolars and ROTATE

Question 13

How do you clinically check SUPPORT of upper dentures?

Answer 13

Put finger on palate and pull forward to check post-dam seal

Question 14

Why do you get patient to move their tongue when taking an impression?

Answer 14

To capture the functional sulcus
Border moulding of the lingual pouch

Question 15

When doing a jaw registration for partial dentures, why do you put soft wax ONLY on the saddle areas?

Answer 15

Otherwise would prop bite open.
Need to see index teeth touching to ensure OVD isn’t propped open.

Question 16

Briefly describe how to do a RE-LINE?

Answer 16

If base extension is good, trim any obvious undercuts on lower denture
Mix the re-line material, put in denture - cover entire are but not super thick
Get pt. to slowly close and bring teeth together.
Ensure mid-line is accurate and teeth touch together.

Question 17

What impression material should you use for super resorbed mandibular ridge?

Answer 17

Impression compound - more stable??

Question 18

What is the definition of SUPPORT?

Answer 18

Resistance to occlusally directed load

Given by rest seats

Question 19

What is the definition of RETENTION and different types?

Answer 19

Resistance to vertical displacement forces.
Can be:
Mechanical - clasps/guide planes,
Muscular - buccinator, orbicularis oris,
Physical - cohesion and adhesion

Question 20

What is the definition of STABILITY?

Answer 20

Resistance to horizontal displacement forces in function e.g. keep denture in neutral zone

Question 21

What is the definition of INDIRECT RETENTION and how is it provided?

Answer 21

Resistance to rotational displacement forces.
It is provided by supporting components e.g. a rest preventing disto-vertical rotational displacement of a saddle. Should be ideally 90° to the axis of rotation. Should be on the opposite side of the axis of rotation to the displacing force. Mainly used in free end saddles.