Prosthodontics

Question 1

Intro

what is a removable PD

Answer 1

not fixed permanently in the patients mouth

Question 2

intro

What is a partial denture

Answer 2

replaces some of the teeth

Question 3

into

what is a denture

Answer 3

a set of replacement teeth
- often made frorm cobalt chrome or acrylic

Question 4

Intro

What are consequences of missing teeth?

Answer 4

• anatomical
• unwanted tooth movements
• appearance
• functional
• emotional/psychological

Question 5

intro

Define saddle

Answer 5

the part of a partial denture which is in contact with alveolar mucosa

Question 6

intro

define free ended saddle

Answer 6

no natural tooth distally

Question 7

intro

define a bounded saddle of a parital denture

Answer 7

natural tooth either side

Question 8

intro

define support in regards to RPD

Answer 8

the resistance to verticle movemtn of the denture towards the tissue

Question 9

intro

define retention in regards to RPD

Answer 9

the resistance to displacement of the denture away from the tissue

Question 10

intro

define stability in regards to RPD

Answer 10

the resistance to horizontal (lateral) movements of the denture

Question 11

intro

what is a kennedy class I

Answer 11

bilateral free end saddle

Question 12

intro

what is a kennedy class II

Answer 12

unilateral free end saddle

Question 13

intro

what is a kennedy class III

Answer 13

bounded saddle

Question 14

intro

what is a kennedy class IV

Answer 14

bounded saddle crossing the midline

Question 15

intro

what is craddock class I

Answer 15

tooth borne
- saddles supported by abutment teeth on both sides

Question 16

intro

what is an abutment

Answer 16

a tooth, tooth root, or implant used to support a fixed or removable bridge or partial denture

Question 17

intro

what is a kennedy class II

Answer 17

mucosa borne
- vertical biting forces resisted entirely by mucosa

Question 18

intro

what is a craddock class III

Answer 18

tooth and mucosa borne
- tooth supported only at one end of saddle
- denture rests on mucosa and teeth

Question 19

patient examination

what needs to be assessed of a patients current denture design?

Answer 19

• retention
• stability
• extension
• occlusion
• damage

Question 20

patient examination

what special tests can be carried ot to assess abutment teeth with regards to denture design?

Answer 20

• radiograph
• electrical pulp test
• thermal test
• 6-point pocket chart
• clinical photographs

Question 21

patient examination

what are index teeth?

Answer 21

teeth that meet to give occlusion vertical dimension

Question 22

primary impressions & jaw registration

what are primary casts mainly used for?

Answer 22

to look at undercuts and saddles before master impressions

Question 23

primary impressions & jaw registration

how can the length and depth of a tray be altered

Answer 23

• add ribbon wax
  or
• remove overextensions with acrylic bur on straight handpiece

Question 24

primary impressions and jaw registration

how are impressions decontaminated?

Answer 24

1. rinse
2. place in perform for 10 mins
3. indicate on lab card impressions have been decontaminated
4. bag with paper towel or cotton wool and take to lab ASAP

Question 25

primary impressions and jaw registration

when are primary jaw registrations not necessary?

Answer 25

• can hand articulate the cast
• enough index teeth present
• reflective of patients mouth

Question 26

primary impressions and jaw registration

what is a wax wafer used for?

Answer 26

inter-occlusal record
- where teeth contact, wax should be pierced

Question 27

primay impressions and jaw registration

how do you record primary registration?

Answer 27

1. bring blocks to required occlusal level
2. add bite registration paste and ask patient to occlude
3. check index teeth are still in contact

Question 28

primary impressions and jaw registration

what can occur is index teeth are not in contact when recording primary registration?

Answer 28

• increased occlusal vertical dimension
• inadequate freeway space

Question 29

primary impressions and jaw registration

what needs to be done before taking master impressions?

Answer 29

1. design the denture
2. identify any teeth that may require modification
3. if planning on CoCr denture request lab to survey primary casts, and following primary jaw registration (if required), mount on articulator and return to you special trays

Question 30

system of design

what are the key principles of an RPD design?

Answer 30

1. replace lost teeth and tissues, restoring function, speech and aesthetics
2. minimize damage to adjacent teeth, restoration and tissues
3. designed with periodontal health in mind

Question 31

system of design

whats the difference between kennedys classification 3 and 4?

Answer 31

class 3: single bounded saddle not crossing the midline
class 4: single bounded saddle crosses midline

Question 32

system of design

give 3 examples of common mandibular major connectors

Answer 32

1. lingual plate (bad periodontally)
2. lingual bar
3. acrylic plate

Question 33

system of design

give 3 examples of common maxillary major connectors

Answer 33

1. anterior palatal bar (better for pateints with bad gag reflex)
2. mid palatal bar
3. acrylic plate

Question 34

system of design

what is the fulcrum line?

Answer 34

the line whcih an RPD will rotate

Question 35

system of design

what can occur if denture has inadequate support via rests?

Answer 35

denture sinks into tissues and causes trauma to them

Question 36

system of design

how is reciprocation and retention acheived via clasps?

Answer 36

reciprocation: clasps arm prevents tooth moving
retention: clasp arm engages undercut