Prosthodontics Flashcards
Intro
what is a removable PD
not fixed permanently in the patients mouth
intro
What is a partial denture
replaces some of the teeth
into
what is a denture
a set of replacement teeth
- often made frorm cobalt chrome or acrylic
Intro
What are consequences of missing teeth?
- anatomical
- unwanted tooth movements
- appearance
- functional
- emotional/psychological
intro
Define saddle
the part of a partial denture which is in contact with alveolar mucosa
intro
define free ended saddle
no natural tooth distally
intro
define a bounded saddle of a parital denture
natural tooth either side
intro
define support in regards to RPD
the resistance to verticle movemtn of the denture towards the tissue
intro
define retention in regards to RPD
the resistance to displacement of the denture away from the tissue
intro
define stability in regards to RPD
the resistance to horizontal (lateral) movements of the denture
intro
what is a kennedy class I
bilateral free end saddle
intro
what is a kennedy class II
unilateral free end saddle
intro
what is a kennedy class III
bounded saddle
intro
what is a kennedy class IV
bounded saddle crossing the midline
intro
what is craddock class I
tooth borne
- saddles supported by abutment teeth on both sides
intro
what is an abutment
a tooth, tooth root, or implant used to support a fixed or removable bridge or partial denture
intro
what is a kennedy class II
mucosa borne
- vertical biting forces resisted entirely by mucosa
intro
what is a craddock class III
tooth and mucosa borne
- tooth supported only at one end of saddle
- denture rests on mucosa and teeth
patient examination
what needs to be assessed of a patients current denture design?
- retention
- stability
- extension
- occlusion
- damage
patient examination
what special tests can be carried ot to assess abutment teeth with regards to denture design?
- radiograph
- electrical pulp test
- thermal test
- 6-point pocket chart
- clinical photographs
patient examination
what are index teeth?
teeth that meet to give occlusion vertical dimension
primary impressions & jaw registration
what are primary casts mainly used for?
to look at undercuts and saddles before master impressions
primary impressions & jaw registration
how can the length and depth of a tray be altered
- add ribbon wax
or - remove overextensions with acrylic bur on straight handpiece
primary impressions and jaw registration
how are impressions decontaminated?
- rinse
- place in perform for 10 mins
- indicate on lab card impressions have been decontaminated
- bag with paper towel or cotton wool and take to lab ASAP
primary impressions and jaw registration
when are primary jaw registrations not necessary?
- can hand articulate the cast
- enough index teeth present
- reflective of patients mouth
primary impressions and jaw registration
what is a wax wafer used for?
inter-occlusal record
- where teeth contact, wax should be pierced
primay impressions and jaw registration
how do you record primary registration?
- bring blocks to required occlusal level
- add bite registration paste and ask patient to occlude
- check index teeth are still in contact
primary impressions and jaw registration
what can occur is index teeth are not in contact when recording primary registration?
- increased occlusal vertical dimension
- inadequate freeway space
primary impressions and jaw registration
what needs to be done before taking master impressions?
- design the denture
- identify any teeth that may require modification
- 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
system of design
what are the key principles of an RPD design?
- replace lost teeth and tissues, restoring function, speech and aesthetics
- minimize damage to adjacent teeth, restoration and tissues
- designed with periodontal health in mind
system of design
whats the difference between kennedys classification 3 and 4?
class 3: single bounded saddle not crossing the midline
class 4: single bounded saddle crosses midline
system of design
give 3 examples of common mandibular major connectors
- lingual plate (bad periodontally)
- lingual bar
- acrylic plate
system of design
give 3 examples of common maxillary major connectors
- anterior palatal bar (better for pateints with bad gag reflex)
- mid palatal bar
- acrylic plate
system of design
what is the fulcrum line?
the line whcih an RPD will rotate
system of design
what can occur if denture has inadequate support via rests?
denture sinks into tissues and causes trauma to them
system of design
how is reciprocation and retention acheived via clasps?
reciprocation: clasps arm prevents tooth moving
retention: clasp arm engages undercut
