Special Technique CD

Question 1

What is denture security?

Answer 1

Combination denture retention and stability

Question 2

What is denture retention?

Answer 2

Ability to resist force in axial direction - away from denture bearing tissue

Question 3

How is retention achieved in complete denture?

Answer 3

Peripheral seal
Cohesion between denture and oral mucosa
SA denture bearing area

Question 4

How is retention achieve in partial denture?

Answer 4

Tooth undercut

Cohesion between denture and mucosa

Question 5

What can compromise retention of full denture?

Answer 5

Poor denture adaptation to underlying tissue
Unfavourable supporting anatomy
Dry mouth
Ingress air - lack posterior seal

Question 6

What is unfavourable anatomy?

Answer 6

Fibrous ridge

Atrophic alveolus

Question 7

What is denture stability?

Answer 7

Ability resist force displacing dentures other than axial - resistance lateral and antero-posterior movement

Question 8

Key factor in denture stability?

Answer 8

Size and shape resiudal ridge

Question 9

What is neutral zone?

Answer 9

Potential space for lips and cheek on buccal/ tonuge on lingual side –> space where forces between tongue and cheek/lips are equal

Question 10

Keys to managing neutral zone?

Answer 10

Lower incisior/premolar should not be set inside ridge
Lower premolar not outside ridge
Molars shouldn’t be lingually inclided - tongue lift denture

Question 11

How to identify relation of tooth on denture to case?

Answer 11

Candulor static pointer

Used at try in stage - shine light onto occlusal surface, remove denture and assess on model

Question 12

Issue with tooth position in class III?

Answer 12

Anterior teeth can be retroclinced = edge-edge bite

May have bilateral cross-bite so lower molars sit on ridge

Question 13

What happens in neutral zone encroached?

Answer 13

Musculature forces cause instability / denture to lift

Question 14

Can record neutral zone?

Answer 14

Use heat cured base for lower registration block
Carry out normal registration so rims in contact as CR and correct OFH
Remove most wax anterior region - apply alignate adhesive
Replace missing wax w/ alignate
Place in mouth - occlude teeth and make ‘oo’ ‘ee’ sound to record

Question 15

What does pre-centric mean?

Answer 15

Prior to first tooth-tooth contact during mandibular closure in CR

Question 16

Aim pre-central check record?

Answer 16

Correct occlusal discrepancy so RCP=ICP

Question 17

What intra-oral technique can be used for pre-centric check?

Answer 17

Place bite reg paste/wax bilateral on mandibular posterior teeth - mandible closed and stop prior first tooth contact

Question 18

Most reliable way to do pre-centric check?

Answer 18

Gothic arch tracing - reduce operator error

Question 19

What is BULL rule used for?

Answer 19

To get balanced occlusion in lateral excursion

Question 20

Ideal tooth movement during lateral excursion?

Answer 20

Group function working side

Balancing contact non-working side

Question 21

How to use BULL rule?

Answer 21

When adjusting working side ONLY ADJUST BUCCAL UPPER AND LINGUAL OF LOWER

Question 22

Issues w/ full denture opposing natural teeth?

Answer 22

Increased risk of dislodgement during function

May be fibrous ridge

Question 23

Most complex challenges when providing denture against natural teeth?

Answer 23

Complete lower denture against upper teeth

Question 24

What impression take if fibrous ridge?

Answer 24

Mucostatic recording of fibrous ridge - use combination tray (space created)

Question 25

What tray request if fibrous ridge?

Answer 25

Perforated spaced tray - allows material to flow reducing compression

Question 26

How communicate technician fibrous ridge?

Answer 26

Use indelible pencil on primary imp

Question 27

What impression material use for fibrous ridge?

Answer 27

ZoE

Can use light body silicone if very fibrous