occlusion theory for complete denture Flashcards
Define ideal denture occlusion
The teeth meeting all at the same time at the correct OVD in the retruded position
What do we need to know to create the ideal denture occlusion
- How the jaws move
- How the teeth meet
- OVD
- RVD
What do we mean by occlusion
How the teeth relate to each other in terms of:
1. How they come together when patent closes
2. How they contact each other when protruding, moving side to side
What holds a complete denture in the mouth
- Border seal
- Weak muscular forces
- Weak intermolecular forces between denture and saliva
What type of occlusal relationship do we need to have in a complete denture
Group function
Why do we not aim to recreate canine guidance in complete denture patients
Canine guidance can cause disclusion in a way that prevents contact between the teeth
How does the jaw open normally
Lateral pterygoid pulls the condyle forward and backwards (translation and rotation)
How does the jaw close normally
Temporalis pulls jaw up
masstter provided power to chew
What is ICP
Intercuspal position (when mouth is closed naturally)
Where is the condyle in ICP
Condyle in the glenoid fossa is slightly foreword and slightly down
What is RCP
Retruded contact position
When the teeth are slightly apart when the jaw is closed
State the ideal dentate occlusion
Ideal occlusion for the dentate patient is concerned with reducing interferences and lateral forces on posterior teeth
Describe the ideal dentate occlusion
- Immediate discussion of posterior teeth on lateral or protrusive movement
- Canine guidance
- No premature contacts or interferences
- No pain due to overloading of periodontal ligament
State the ideal edentate occlusion
Ideal occlusion for the edentate patient is concerned with denture stability, reducing excessive forces on the denture bearing tissues with minimal strain on the muscles of mastication
Describe the ideal edentate occlusion
Tooth contacts should be coincident across as many teeth as possible whether in iCP or lateral movements
What does denture stability rely on
- Balanced occlusion
- Balanced articulation
What is balanced occlusion
The ideal interdigiation of the teeth in which there is no cuspal interference in any position of jaw closure
Is balanced occlusion a static or dynamic situation
Static
What is balanced articulation
The ideal interdigiation of the teeth in which there are no cuspal interferences when the jaw is moved from side to side
Is balanced articulation a static or dynamic situation
Dynamic
What do we use to ensure the teeth are in balanced articulation
Curve of monson
What does the curve of monson ensure
That the teeth on the non working side are lower than the teeth on the working side when the jaw is moving
How do we ensure teeth are in balanced occlusion
By following curve of Spi
What does the curve of spee ensure
That when are teeth are meeting in a protruded way the back teeth stay in contact ensure all the pressure isn’t on the front teeth which would result in the denture falling down
What are the curve of spee and monson known as
Compensating curve
What is the free away space
A gap that naturally occurs between the upper and lower teeth when at rest
What is the average of the free way space
2-4mm
What does OVD stand for
Occlusso vertical dimension
Teeth together in ICP
What does the RVD stand for
Resting vertical dimension
Distance when teeth are apart while the jaw is at rest with lips together and breathing through nose
How do we measure a patient FWS
RVD - OVD
How do we measure OVD
Distance between nose and chin when patient is biting down
How do we measure RVD
Distance between nose and chin when patient is at rest (pretending like they are watching tv)
Why is the free way space important
- Reduces stain on the muscles of mastication
- Reduces load on the denture supporting tissues
What can happen if we have a lack of free way space
- Teeth will constantly be in contact leading to increased load on denture bearing tissues
- Increased load
- Teeth click together when speaking
What can happen if you have too much free way space
- Over close and protrusion to get teeth to meet
- Difficulty eating
- Teeth do not show
In order to get the correct OVD what two positions must we be aware of
- Retuned position
- Resting vertical dimension
What is the retruded position
Where the condyle is the most poster superior area within the glenoid fossa
How can we encore the patent to get into the retruded position
Ask the pt to curl their tongue to the back of their mouth
