Intro To Partial Dentures Flashcards
What is a prosthesis?
An artificial body part that replaces a missing part
What are dentures?
Set of replacement teeth usually made from cobalt chrome or acrylic
What are some reasons patients have missing teeth?
Caries
Cancer
Periodontitis
Trauma
Hypodontia
Endodontic disease
What teeth are most commonly hypodontic?
Wisdom teeth 3rd molar
What are the anatomical changes missing teeth can cause?
Extral-oral
- changes in facial appearance
- tmj problems (possibly)
Intra-oral
- alveolar resorption
- tooth movement
- tooth wear
Why do the changes in facial appearance occur?
Due to loss of hard and soft tissues which support the face
What are the general consequences of missing teeth?
Anatomical
Unwanted tooth movements
Appearance
Functional
Speech
Mastication
Emotional/psychological
How can we replace missing teeth?
No treatment (leave space)
Resin bonded bridgework
Conventional bridgework
Implant crowns/bridgework
Removable partial dentures
Complete dentures
Implant retained dentures
What is a shortened dental arch?
A dentition where most posterior teeth are missing
How is the conventional bridgework carried out?
Abutment teeth either side of the space prepared for crowns (retainers)
The replacement tooth (Pontic) is held in place by the retainers
What is a saddle?
A saddle area is the area of the missing teeth to be restored with a partial denture
A saddle is the part of the denture that carries the replacement artificial teeth to fill the space
What are the types of saddle areas?
Bounded saddle (abutment teeth on either die of the space)
Free-end saddle (one abutment tooth anterior to the space)
What are the three important concepts in denture making?
Support - the resistance to vertical movement of the denture towards the tissue
Retention - the resistance to displacement of the denture away from the tissue
Stability - the resistance to horizontal (lateral) movement of the denture
What are the types of rest and what important components do they provide?
Occlusal
Cingular
Incisal
Support and stability
What important component do clasps give?
Retention
What are the types of connectors?
Minor
Major
What are the materials used for partial dentures and how do they work?
Acrylic Resin
-base that holds replacement teeth, thermoplastic resin is used (polymethylmethaacrylate), has a clasp to help with retention
Cobalt Chrome
-cast framework that hold the replacement teeth, metal alloy of cobalt and chromium
Nylon Resin
-thin and flexible valplast (not used)
What is the class of a bi-lateral free-end saddle classification?
Kennedy class 1
What is the class of a uni-lateral free-end saddle classification?
Kennedy class 2
What is the class of a unilateral bounded saddle classification?
Kennedy class 3
What is the class of a midline saddle classification?
Kennedy class 4
For the method of support, what is craddock class 1?
Saddles supported on both sides by abutment teeth
For the method of support, what is craddock class 2?
Vertical biting forces resisted entirely by soft tissues
For the method of support, what is craddock class 3?
Tooth supported at only one end of the saddle
