Complete dentures: retention and stabililty Flashcards
(36 cards)
Why is treatment too edentulous patients important
- Speech
- Function
- Aesthetics
- Maintain alveolar bone levels
- Fix sunken cheeks
Talk though the steps required in the labs and clinics when making a complete denture
- Primary impressions
- Cast model and create special tray
- Secondary impressions
- Cast models and create record rims
- Jaw registrations
- Mount on articulator
- Try in
- Process to finish
- Fit
What is retention
The forces that stop a denture coming out
What is stability
The forces that stops the denture moving during function
How do we provide adequate retention to a complete denture
- Border seal
- Saliva
- Muscular forces
What creates the border seal on a complete denture
The junction between the flanges and the cheek
Where is there a problem creating a border seal and why
At the back of the mouth as there’s no flange there
How do we create.a border seal at the back of the mouth
By making a post dam
What is the issue if we dont have a continuous border seal around the mouth
Wont achieve adequate retention as air, saliva and food can get under the denture
Define post dam
A raised border along the poster extent of the upper denture
What is the purpose os a post dam
To provide an air tight seal between the denture and the palatal mucosa
Where does the post dam need to be positioned
ON the hard palate infant of the soft palate as far back in the mouth as possible (the vibrating line)
How do we create an effective border seal
- Non perforated tray
- Use green/ pink stick to compress the post dam area and record the functional width of the sulcus in the tuberosity region
What must we have to create an effective border seal
Saliva
Describe saliva
Sticky
Why is saliva sticky
Due to weak molecular forces
What is a lack of saliva called
Xerostomia
Why can patients suffer from xerostomia
- Drugs
- Radiotherapy
- Rheumatoid artirtis
- Sjogrens
How can we test for xerostomia
Wipe gloved finger along inside of cheek
Why are muscular forces important in retention of a complete denture
Keep the seal intact and push the denture into places
Tongue can be used to keep the back of the denture from dropping down
Name some conditions that can lead to lack of muscle control
- Parkinsons
- Stroke
- Motor neurone disease
In lower dentures which forces must be equal
Muscular forces from the cheek and lingual forces from the tongue
(The neutral zone)
What is the neutral zone
When muscular forces from the cheek and lingual forces from the tongue are equal
What can happen if a lower denture is not in the neutral zone
The tongue or the cheek will end up releasing more force which will dispose the denture
