Occlusion for the Partially Edentulous Patient Flashcards
what is mutually protected occlusion also known as
optimal functional occlusion
what is mutually protectde occlusion
- multiple, even, bilateral, simultaneous contacts of the posterior teeth in MIP with the mandible in CR position
- MIP and CR are coincident
the anterior teeth exhibit _____ occlusal contacts as compared to posterior teeth in MIP
lighter
posterior teeth are axially loaded in _____
MIP
in excursive movements there is_____ guidance and _____ guidance
canine and anterior
anterior teeth protect ____ and vice versa
posterior teeth
the _____ teeth withstand the majority of the load in MIP, protecting anterior teeth from high loads
posterior
the anterior teeth disclude the posterior teeth in _________ movements, thereby protecting the posterior teeth from off axis loading
excursive movements
what are the occlusal schemes during excursive movements
- canine guidance- anterior guidance
- group function (unilateral balance)
- balanced occlusion ( bilateral balance)
where do you begin?
- evaluate the current condition of teeth, supporting structures, intra-oral and peri-oral tissues
- and occlusion
what do you use to evaluate occlusion
intraorally and on articulated diagnostic casts
what is canine guidance
the canines on the working side guide the movement when the mandible moves laterally causing all other teeth to disclude
what is anterior guidance
the anterior teeth disclude the posterior teeth when the mandible moves in protrusion
what discludes the posterior teeth when the mandible moves in protrusion
the canines, central and lateral incisors
contacts between the posterior teeth during excursive movements are considered _____ that can create damaging effects on teeth and periodontium
interferences
mandible is a class ____ lever
III
the more anterior the resistance occurs, the ____ the impact
lesser
more anterior is ____ from the fulcrum
further
which tooth has the longest root and best bone support
canine
what are the anterior controlling factors
- anterior teeth
- anterior guidance
what determines how the anterior portion of the mandible moves
anterior teeth
what is anterior guidance controlled by
position and contours of anterior teeth
what is anterior guidance altered by
- restorations
- orthodontics
- extractions
- caries
- habits
- tooth wear
anterior guidance is a ____ factor rather than a fixed factor
variable
what is the anterior guidance angle
the angle formed by the intersection of the horizontal plane and the disclusive pathway of the anterior teeth
what is anterior guidance angle influenced by
- vertical overlap (VO)
- horizontal overlap (HO)
what does increased VO angle do to anterior guidance angle
increases it
what does increased HO overlap do to anterior guidance angle
decreases it
increased anterior guidance angle:
-allows steeper cusps on posterior teeth
- decreases the likelihood for occlusal interferences
what is group function
when the mandible moves laterally, the outer inclines of the mandibular buccal cusps, on the working side slide along the inner inclines of the bcucal cusps of the maxillary posterior teeth guiding the movement
what is balanced occlusion
simultaneous contacts on both sides ( working and non working) during lateral excursive movements (working side contacts and balancing side contacts)
- contacts between the posterior and anterior teeth during protrusive movement
what patients is balanced occlusion not acceptable for and why
- for dentate patients
- promotes tooth wear on natural teeth
- non working side contacts are extremely destructive and must be avoided
when is balanced occlusion an acceptable form of occlusion
for removable prostheses
describe malocclusion
- lack of posterior occlusion
- significant wear of maxillary and mandibular anterior teeth
- mandibular anterior teeth are aupraerupted
- posterior teeth are supraerupted
what is the plane of occlusion
an imaginary surface that touches the incisal edges of the incisors and cusp tips of the occlusing surfaces of the posterior teeth
the plane of occlusion curves to fit the _____ and _____ of all the teeth
occlusal surfaces and incisal edges
is the plane of occlusion flat
no
plane of occlusion is ____ on the mandible
concave
plane of occlusion is ______ on the maxilla
convex
what is an interference
any unwanted or premature interocclusal contact
what are the types of occlusal interferences
- centric interferences
- working side interferences
- non working side interferences
- protrusive interferences
why do we need to eliminate occlusal interferences
- potentially destructive
- interfere with the patients ability to incise properly
-involve mesial inclines of mandibular posterior teeth and distal inclines of maxillary posterior teeth - disruption of normal muscle function
where are working interferences located
- posterior teeth
- same side as the direction that the mandible moves (working)
- disclude anterior teeth = an interference
- involves maxillary buccal cusps and mandibular buccal cusps and/or maxillary lingual cusps and mandibular lingual cusps
describe non working interferences
- opposite to direction of movement
- particularly destructive in nature
- involves maxillary lingual cusps and mandibular buccal cusps
the potential for damage in non working side interferences is attributed to:
- changes in the mandibular leverage
- forces outside the long axes of the teeth
- disruption of normal muscle function
what are the RPD treatments in predoctoral clinic at UMKC
- completed axium record
- diagnostic casts
- survey of casts and proposed design
- articulation of casts and occlusal analysis of exisiting conditions and propposed treatment
for most situations you should maintain the existing _____ dimension
occlusal vertical
ensure adequate _______ space with a suitable occlusal plane
interarch/interocclusal space
