Occlusion for the Partially Edentulous patient Flashcards
MUTUALLY PROTECTED OCCLUSION
also known as OPTIMAL FUNCTIONAL OCCLUSION
*Multiple, even, bilateral, simultaneous occlusal contacts of the posterior
teeth in MIP with the mandible is CR position i.e. MIP and CR are coincident.
The — teeth exhibit lighter occlusal contacts as compared to — teeth in MIP
anterior
posterior
— teeth are axially loaded in MIP
Posterior
In excursive movements there is — guidance
canine guidance and anterior
MUTUALLY PROTECTED OCCLUSION
Anterior teeth protect Posterior teeth and vice versa
*The posterior teeth withstand the majority of the load in MIP, protecting
the anterior teeth from high loads.
*The anterior teeth disclude the posterior teeth in excursive movements,
thereby protecting the posterior teeth from off-axis loading.
Occlusal Schemes during excursive movements
(3)
1) Canine guidance - Anterior guidance
2) Group function (unilateral balance)
3) Balanced occlusion (bilateral balance)
Evaluate the current (2)
condition (teeth, supporting structure, intra-oral
and peri-oral tissues)
and
Occlusion
How to evaluate Occlusion
(2)
*Intraorally and on Articulated Diagnostic casts
Canine guidance:
the canines on
the working side guide the
movement when the mandible
moves laterally causing all other
teeth to disclude
Anterior Guidance:
the anterior teeth disclude the posterior
teeth when the mandible moves in protrusion
Contacts between the posterior teeth during excursive movements are considered — that can create damaging effects on teeth and periodontium.
interferences
Why is Canine Guidance/Anterior
Guidance the optimal occlusal scheme?
*Mandible - Class III lever
(2)
*The more anterior (away from the fulcrum), the resistance (load) occurs, the
lesser the impact (magnitude)
*The canine(s) has the longest root, and best bone support (canine eminence)
ANTERIOR CONTROLLING FACTORS
(3)
*ANTERIOR TEETH
*ANTERIOR GUIDANCE
ANTERIOR TEETH: they determine how
the anterior portion of the mandible
moves
ANTERIOR GUIDANCE
Controlled by (2)
position and contours of anterior teeth
ANTERIOR GUIDANCE
Controlled by position and contours of anterior teeth
ALTERED BY
(6)
- RESTORATIONS
- ORTHODONTICS
- EXTRACTIONS
- CARIES
- HABITS
- TOOTH WEAR
Anterior Guidance is a — rather than a — FACTOR
VARIABLE
FIXED
ANTERIOR GUIDANCE ANGLE
*THE ANGLE FORMED BY THE INTERSECTION OF THE HORIZONTAL
PLANE AND THE DISCLUSIVE PATHWAY OF THE ANTERIOR TEETH
ANTERIOR GUIDANCE ANGLE
Influenced by
(2)
- vertical overlap (VO)
- horizontal overlap (HO)
- VO overlap — : ANTERIOR GUIDANCE ANGLE —-
increase
increase
HO overlap — : ANTERIOR GUIDANCE ANGLE —
increase
decrease
INCREASED ANTERIOR GUIDANCE ANGLE:
(2)
- Allows steeper cusps on posterior teeth
- decrease likelihood for Occlusal Interferences
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
buccal cusps of the maxillary posterior teeth, guiding the movement.
Balanced Occlusion
(2)
*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
Balanced Occlusion
*not acceptable for
*promotes
*— contacts are extremely destructive and must be avoided
dentate pts
tooth wear on natural teeth
non-working side
