DENTURES 1 Flashcards
What is the labial Frenum
Part where lip is attached to alveolar process
What is the vibrating line?
Junction of hard and soft palate
How does the maxillary tuboristy appear in the edentulous patient?
Larger
What is the purpose of the lingual frenum?
Attaches tongue to alveolar process
Where is the Hamular Notch located?
Between distal surface of tuberosity and the hamular process of the medial pterygoid plate.
Why is the hamular notch the ideal site for the distal border of denture?
Helps with posterior seal.
What can over and under extension of upper denture beyond hamular notch cause?
Over- pain or looseness
Under- poor retention
What is the issue with the lower arch when supporting a denture ?
Offers less support- but good height and width helps!
What is the issue with a narrow ridge on the lower?
Offers less support as soft tissue can be mobile and unstable
What is the retromolar pad?
Triangular pad of soft tissue on the posterior end of edentulous ridge
How much of the retromolar pad should we aim to cover with denture?
Two-thirds (provides support)
Where is the retromylohyoid space?
distal end of lingual sulcus (posterior to mylohyoid muscle)
How does the retromylohyoid space aid retention and stability?
Retention- has small undercut
Stability- Impinges on ramus to prevent sideways movement
What are the different ridge types as per Cawood and Howell’s Classification?
- Dentate
- Post extraction
- Broad alveolar process
- Knife edge
- Flat ridge (no alveolar process)
- Submerged/ inverted ridge (loss of basal bone)
What is the ideal ridge form in edentulous patients?
Broad
What is the issue with knife edge ridges?
Pain on loading
What are the intra-oral changes when all teeth are lost`?
No remaining periodontium, so bone is not retained around teeth and bone loss continues throughout lifetime
When is bone loss at its max following loss of teeth?
First 3 months
So dentures may need to be remade or relined following extraction after this period
How does the alveolar ridge resorb in Uppers?
Ant/Post- backwards and upwards
Coronal- Inwards and upwards
How does the Lower alveolar ridge resorb ridge?
Ant/Post- downwards and slightly forwards (more vertical)
Coronal- outwards and downwards
Why are dentures sometimes created with a crossbite?
As the lower ridge often widens, so it helps deal with difference in resorption with uppers
How does the ridge appear shortly after extraction?
Bulbous and irregular
What extra oral changes occur in edentulous patients?
Loss of upper lip support
Lower lip can disappear
Reduced lower facial height (change in profile)
Nasiolabial angle increase
Why do edentulous patients appear class III?
Further rotation of the mandible
