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BDS5 > Removable Pros > Flashcards

Removable Pros Flashcards

1
Q

What mouth preparations do you need to do before making dentures

A

-Manage perio disease
-Extract poor prognosis teeth
-Restore teeth before master imp
-Treat denture stomatitis
-Treat denture granuloma

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2
Q

What are the functions of primary casts

A

-To make special trays
-Patient education
-Pre/post treatment records
-Plan denture

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3
Q

What is jaw relationship

A

-Horizontal and vertical component
-Must be reproducible

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4
Q

What is centric relation

A

-Condylar disc assembly is in the most superior anterior position within the glenoid fossa

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5
Q

When do we use centric relation

A

-Less than 3 contacts
-Wear cases where the teeth are being built up

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6
Q

What does a facebow record

A

-Relationship between the terminal hinge axis (runs between condylar heads) and upper occlusal plane

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7
Q

What are the function of rest seats

A

-Transmit forces along the long axis of the tooth
-Provide support (prevent damage to soft tissues)
-Stabilise occlusion
-Prevent some horizontal movement
-Prevent food packing

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8
Q

What are guide planes and what are they used for

A

-Two or more parallel tooth surfaces
-Provide friction to retain denture
-Enable path of insertion to be restricted to ensure accuracy of clasps
-Contribute to retention and stability
-Reduces black triangles

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9
Q

What is path of insertion

A

Path of the denture from first point of contact to seating

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10
Q

Why are special trays more accurate

A

-Allow an even thickness of material all around
-This reduces distortion

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11
Q

What is the Kennedy classification

A

Class I: Bilateral free-ended saddle
Class II: Unilateral free-ended saddle
Class III: Unilateral bounded saddle
Class IV: Bilateral anterior bounded saddle

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12
Q

What are the types of clasps, reciprocation and indications for each

A

-Gingivally approaching clasps: anterior teeth, cingulum rest seat for reciprocation
-Occlusally approaching clasps: premolars/molars, reciprocating arm

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13
Q

How do clasps work

A

-Terminal third of the clasp arm engages in the undercut
-Accuracy improved with guide planes

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14
Q

Advantages of CoCr over acrylic

A

-Stronger
-Less bulky
-Hygienic design (lingual bar)
-Provides tooth support and better retention
-Easier to clean
-Metal overlays are possible
-Better thermal conductivity

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15
Q

List effects of tooth loss on denture construction

A

-Loss of alveolar bone
-Change in occlusal scheme
-Drifting and rotating of teeth
-Excessive load on remaining teeth
-Changes to speech
-Changes to facial profile

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16
Q

Why is a denture better than fixed pros?

A

-Cheaper to make
-Can replace large edentulous spans
-Reversible
-Temporary option

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17
Q

Types of rest seats and when you need to to tooth prep for a rest seat

A

-Occlusal, cingulum and incisor rest
-Prep tooth if there is not enough occlusal clearance OR to correct the occlusal surface

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18
Q

Disadvantages of dentures

A

-Plaque traps
-Can exacerbate periodontal disease
-Bulky
-Poor compliance due to comfort
-Ulcers/pain underneath

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19
Q

Anatomical landmarks to record in the impression

A

-Retromolar pad
-Maxillary tuberosity, hamular notch, vibrating line
-Sulci, frenum

20
Q

What is the denture space

A

Space between tongue, lips and cheeks and residual alveolar ridges

21
Q

What are the three denture surfaces

A

-Occlusal surface
-Fit surface
-Polished surface

22
Q

What features help with retention of the denture

A

-Saliva layer gives a suction affect for complete dentures
-Muscles hold in place
-Opposing upper and lower teeth
-Gravity keeps lower denture in place
-Clasps (direct retention)
-Rests (indirect retention)

23
Q

What is the role of saliva in denture retention?

A

-Provides a peripheral seal due to inter surface tension in upper complete dentures
-Thin saliva works better
-Dry mouth –> poor seal

24
Q

How does the sulcus affect denture retention and stability

A

-Denture flange must fill width of sulcus to create a better seal
-Impressions must record full depth of sulcus
-If flange extended too deep, muscles will push the denture out during movement

25
Q

What is the ‘post dam’

A

-Compressible aspect at the junction of hard and soft palate
-Acrylic ridge presses into here
-Mimics peripheral seal obtained in sulcus
-Only for complete uppers

26
Q

Define support

A

Resistance of displacement towards the soft tissues

27
Q

What factors affect support

A

-Condition of underlying tissues
-Amount of coverage of underlying tissues (surface area)

28
Q

Which is better supported: upper or lower complete denture

A

-Upper
-Larger surface area

29
Q

Which causes less trauma: upper or lower complete denture

A

-Upper
-Larger surface area to distribute forces

30
Q

How to check the support of a denture

A

-Press occlusal surfaces on both sides and see if it moves
-Check denture extension is maximised
-Look for soft tissue trauma

31
Q

Define retention

A

Ability to resist displacement away from the denture bearing area at rest

32
Q

Define stability

A

Ability to resist movement in any direction during function

33
Q

What does retention of a complete denture depend on

A

-Surface area covered
-Adaptation to the tissues
-Muscular control
-Adhesion with saliva
-Border seal (suction)
-Gravity (for lower only)

34
Q

How to check retention of denture?

A

-Pull denture down and away from tissues
-Press anteriorly and see if posterior drops

35
Q

What does stability of a denture depend on

A

-Degree of support and retention
-Area covered by denture base
-Degree of bone resorption
-Consistency of supporting tissues
-Level of occlusal plane

36
Q

Why does bone resorption affect stability of denture

A

-Flat denture bearing area causes less surface area
-Denture is more likely to slide sideways

37
Q

If occlusal plane is too high, why is stability of lower denture affected

A

The tongue won’t be able to control the denture

38
Q

If anterior teeth are set too far forward, why is stability of denture affected

A

Lip will push back on the denture

39
Q

How do you check stability of denture

A

-Press unilaterally on occlusal surface
-Observe movement during speech and eating
-Patient history

40
Q

What are the stages of denture design?

A

-Saddle
-Support
-Retention
-Reciprocation
-Connectors

41
Q

What causes midline fractures of acrylic dentures

A

-Poor occlusal scheme
-Uneven support (due to the underlying tissues)
-Alveolar bone resorption due to extracted teeth
-Deep frenum notch
-Dropping the denture
-Palatal tori
-Thin denture

Simple fractures can be repaired but complex fractures cannot

42
Q

What causes fractures of metal connectors

A

-Mechanical fracture is rare
-Usually distortion occurs due to excessive flexing of denture

43
Q

What is the difference between relining and rebasing

A

-Relining is placing new acrylic onto the fit surface without removing the old acrylic
-Rebasing is placing new acrylic onto the fit surface whilst removing some of the old acrylic

44
Q

What are the indications for a reline/rebase

A

-Denture is loose fitting or painful
-Denture is thin and could fracture
-Alveolar bone resorption post extraction
-To repair the denture and avoid making a new one

45
Q

What are the problems with relining/rebasing

A

-Increases the OVD if used in thick sections
-Can cause changes to the occlusal scheme
-Can be damaged during process

46
Q

What are the indications for an over denture

A

-Few teeth/hypodontia
-Extreme tooth wear
-Transitional denture

47
Q

What are the advantages of an over denture

A

-Better retention if using precision attachments
-Better stability
-Preserves bone
-Proprioception is preserved
-Appearance can be improved

BDS5 (4 decks)

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