Week 10 Occlusal Considerations for Operative Dentistry Flashcards
what is the baseline for evaluating patients occlusion
teeth
tmj
musculature
what are the goals of occlusion for direct restorations
-minimize trauma to supporting structures and teeth
-preserve/maintain remaining structures including the existing occlusal scheme
- promote longevity of the restoration
-restore mastication to a reasonable level
what are occlusal contacts on direct restorations created to be in harmony with
the patients existing occlusion
what is the definition of occlusion
the static relationship between the incising and masticating surfaces of the maxillary and mandibular teeth or tooth analogues
what is the definition of articulation
the static and dynamic contact relationship between occlusal surfaces of teeth during function
describe the most desirable contacts of posterior teeth in stationary position
multiple, even, bilateral and simultaneous occlusal contacts with the mandible in CR
how are posterior teeth loaded
axially
how are teeth and their periodontal ligaments best designed to absorb forces
along the long axes
what can failure to achieve axial loading cause
- forces could eventually cause cracks, fractures, and wear on teeth
- trauma to supporting structure: periodontal ligament and surrounding bone
- possible trauma to TMJ
what are ideal contacts of anterior teeth in stationary position
- anterior teeth should have lighter occlusal contacts when the posterior teeth are in occlusion
why cant anterior teeth withstand high loads
because they are not loaded axially
in excursive movements, optimal occlusal relationships are:
canine guidance and anterior guidance
in right lateral movement what is happening on the laterotrusive side
the canine on this side guide the movement
in right lateral movement what is happening on the mediotrusive side
no teeth should contact on this side
when are occlusal interferences present
if in excursive movements, canine guidance and anterior guidance are not present
what is occlusal interference
an unwanted or premature interocclusal contact
what are the two philosophies for interocclusal contacts
-cusp fossa contacts
- cusp marginal ridge contacts
describe the cusp fossa relationships
each functional cusp occludes in a fossa of the opposing tooth
- tooth to tooth arrangement
- used when restoring both opposing quadrants of teeth
describe cusp marginal ridge relationships
- each functional cusp contacts the marginal ridges of opposing pair of teeth or fossae of opposing teeth
- a one tooth to two teeth arrangement
- the majority of natural dentitions have this type
- commonly used for single restorations
what does the cusp marginal ridge occlusal relationship allow for
cusps to occlude onto marginal ridges and some other to occlude into fossae
what does the cusp fossa relationship allow for
only each cusp to occlude into one fossa
what are the 4 inclines present on all cusps
facial, lingual,mesial, and distal
what are MI options when teeth are not ideally positioned
create a plateau halfway up a cuspal incline, that is perpendicular to the long axis of the tooth to serve as a cusp seat
how do you make occlusal adjustments
-small football shaped carbide in a high speed handpiece
-lightly running the rotating bur over the tooth
-remove only the center of the mark
describe anterior teeth protrusion
-mandible moves forward
- anterior teeth guide the movement
