Ideal Occlusion Flashcards
What occlusal scheme is ideal in complete dentures?
Balanced occlusion
What is gnathological function?
Trying to get teeth function in excursion simultaneously
Principles of ideal occlusion?
Distribution of load in favourable way
Mutual protection from unfavourable loads
What does RCP=ICP mean?
When closed posterior teeth contact w/ light contact anterior teeth - occlusal load through axis molar
Condyles positioned distribute load w/ minimal musculature involvement
What does ICP require?
Musculature activity to position condyle/disc
Is RCP=ICP common?
No 90% RCP doesn’t equal ICP
What to be aware of in bruxism?
Function on RCP contacts = damage restorations/ facets on sound teeth
Increased musculature activity in ICP
How distribute force favourably?
Occlusal load down long axis of tooth
What happens if occlusal contact results in horizontal forces?
Wear facet
Tooth movement
Bone loss
Fractures
Why is posterior disocclusion beneficial?
Anterior teeth disocclude posterior teeth preventing lateral forces on posterior teeth
Example of when see posterior disocclusion?
Lateral and protrusive movements - anterior teeth guide
When might see posterior contacts during lateral/protrusive movements?
Working side = group function
Unfavourable
Non-working side interference
Protrusive interference
What is anterior guidance?
Palatal surface of upper incisor dictate mandibular movement in protrusion
Why is canine so useful in occlusion?
Morphology
Good crown: root
Distance from hinge
Highly innervation = proprioception
What is mutual protection?
In ICP posterior teeth protect anterior teeth
In excursions anterior teeth protect posterior
What is group function?
When have multiple contacts on working side
Disocclusion non-working side
What is anterior guidance based o?
Incisor relationship
What expect to see in class I incisor relationship?
Lower incisor occludes at/below cingulum plateau of upper incision w/ minimal overbite/jet
What expect to see in protrusive excursion in class I?
Expect see posterior disocclsuion
What expect to see in class I div I incisor relationship?
Lower incisor occluded behind upper cingulum w/ upper incisor being normal or proclinced
What expect to see in protrusive excursion in class II div I?
Posterior teeth guide mandibular movement in protrusion due increased space between lower incisor and palatal surface of upper
What expect to see in class II div II incisor relationship?
Lower incisor occludes behind cingulum plateau upper incisor - upper incisor retroclined
What expect to see in protrusive excursion in class II div II?
Vertical competent of mandible before protrusion w/ exaggerated posterior disocclusion
What expect to see in class III incisor relationship?
Lower incisor occlude in front of cingulum plateau
What expect to see in protrusive excursion in class III?
Guidance posterior teeth
What see AOB?
No contact anterior teeth
What expect to see in protrusive excursion in AOB?
Excursions all posterior teeth
How deal w/ occlusion in practice?
Know existing occlusion
Know RCP pre and post-operative
Difference between conforming and reorganising occlusion?
Conforming - work to occlusion, don’t create unfavourable contact
Reorganise - aim for ideal occlusion
What is condylar movement dictated by?
Position condyle in fossa
Condylar pathway on articular eminence
Teeth interfere w/ border movement
Advantage of centric relation?
Repeatable
When is CR used?
Complete denture
Check RCP
Reorganisation
Making hard splints
How find CR?
Hard - neuromusculature system programmed close in ICP
Use:
- Bilateral manual manipulation - Dawson Technique
- Anterior jigs
- Gothic arch tracing
How record CR?
Manual manipulation into wax/silicone
Anterior jig w/ silicone
