Lab 1 Flashcards
How ca we replace missing teeth?
- Implants
- Dentures
- Bridge
What are the problems with implants
We sometimes don’t have enough bone to place an implant
What percentage of the adult population have a partial denture
13%
What percentage of the adult population have a complete denture
6%
How do we classify dentures?
- Partial/ complete
- By material
- By support
- Saddle position
Give some ways we can classify dentures according to their material
- Acrylic
- Metal framework
- Arylketone polymers (AKP)
- Polyamide (nylon)
Give advantages of acrylic dentures
Easy to repair or add further teeth to
Give disadvantages of acrylic dentures
Covers large surface of the tooth
Affects taste
Collects plaque
Give advantages of metal framework dentures
Gingival clearance
Covers less palate
Retention and support between than acrylic
Give disadvantages of metal framework dentures
Difficult to repair
Very expense to make
Give some ways we can classify dentures by support
- Mucosal Borne
- Tooth borne
- Tooth and mucosa Borne
Where does the force go on a mucosal borne denture
When you bite on them force goes straight down to the mucosa
What is a negative of mucosal borne dentures
They can exacerbate periodontal disease and increase the resorption of the alveolar ridge
Where does the force go on a tooth borne denture
The force is transmitted down the long axis of the supporting teeth, through periodontal apparatus and into supporting bone
How do we classify dentures using saddle position
Kennedy 1942
Name the different classes of the Kennedy classification
Class I
Class II
Class III
Class IV
What is a class I according to the Kennedy classification
Bilateral free end saddle (no teeth past the final abutment)
What is a class II according to the Kennedy classification
Unilateral free end saddle (one end has teeth past the abutment of the denture)
What is a class III according to the Kennedy classification
Bounded saddle
What is a class IV according to the Kennedy classification
Single bounded saddle anterior to abutment teeth
Which tooth decides the class given to a denture according to the Kennedy classification
By most posterior saddle
What are further saddles called?
Called modification or mod
Give advantages of spoon dentures
low cost
quick means to replace small number of anterior teeth
Give disadvantages of spoon dentures
Localised gingival trauma
Alveolar damage
How can we improve retention and stability on a modified spoon denture
Addition of clasps
Extending the laser into contact with some teeth
Give some advantages of modified spoon dentures
increased retention and stabilty
Increased tooth support due to cingulum rests
Give some disadvantages of modified spoon dentures
- Increased cost
- Wrought wire clasps may fracture
- Covers more gingival tissue
- Bulkier appliance
Give advantages of Colleted denture
- Full palatal cover
- Well tolerated
- Retentive and stable
- easy to manufacture ad adjust or add to
Give disadvantages of Colleted denture
- Full palatal cover
- Covers gingival margin
- Increased plaque retention
What can happen if a collected denture is made incorrectly
If you don’t cover the undercut of the tooth then you can risk traumatising the soft tissues and causing gingival inflammation
Give an example of a bridge we can use to replace mission gteeth
Resin retained bridges
When making a denture what questions do you need to ask yourself before choosing which type
How did the patient lose their teeth?
caries, periodontal disease or trauma
What can happen if someone is given a denture when they have poor oral hygiene
Denture induced stomatitis
What is denture induced stomatitis
It is a fungal infection due to inadequate cleaning of a denture (initially reversible)
What can denture induced stomatitis lea to
Periodontal disease and pocketing
What are the advantages of an Every denture
Provides gingival clearance
What do we aim to achieve with our denture
- Gingival clearance where possible
Name the different types of clasps found on a cobalt chrome denture
- Ring clasp
- I bar
- 3 armed clasps
- T bar
- J bar
- L bar
Name the different types of clasps found on a cobalt chrome denture
- Ring clasp
- I bar
- 3 armed clasps
List the different components of a 3 armed clasp
- Retentive clasp arm
- Reciprocal clasp arm
- Occlusal rest
Where does the retentive clap arm sit
Below the survey line
How does the I bar approach the tooth
Gingivally
How does a ring clasp approach the tooth
Occlusally
What do occlusal rests do
They trait forces down the long axis of the teeth and also prevent the clasp arms from over seating and traumatising gingival tissues
Name the 2 types of connectors
Major connectors
Minor connectors
What is the purpose of a major connector
They join the whole denture together and give denture rigidity
Give some examples of major connectors on an lower denture
- Lingual bar
2. Sub lingual bar
Give some examples of major connectors on an upper denture
- Palatal plate
2. Ring design
List some common features of major connectors
- Must be rigid
- Gingival Clarence where necessary
- Simpler designs collect less plaque
Why do major connectors need to be rigid
To carry out cross arch bracing (want forces transmitted on one side of the denture to be shared on the other side)
What are minor connectors
Small bars that join components such as rests and clasps to the major connectors
Outline the steps we follow when designing a denture
- Outline saddles
- Put rests
- Add clasps
- Add reciprocating arms
- Minor connectors
- Major connectors
