Occlusion for Removable Complete Prosthodontics Flashcards
Centric Relation
The position of the mandible in which the condyles are in the most superior and anterior position in the articular fossae, resting
against the posterior slopes of the articular eminences with the
articular discs interposed.
Centric Relation for edentulous patients (3)
- Used as the reference position on which the casts are articulated
- It is used because it can be verified and it is repeatable
- It is a jaw position and it is independent of teeth position
Master Casts are articulated after using — — records
Centric Relation
Physiologic Rest Position
other terms: Rest Vertical Dimension, Postural position
The postural position of the mandible when an individual is resting comfortably in an upright position and the associated muscles are in a state of minimal contractual activity.
Interocclusal Space/Distance (approximately – mm)
2-4
Occlusal Vertical Dimension (OVD) (2)
•Older term Vertical Dimension of Occlusion (VDO)
•“The distance between 2 selected anatomic or marked
points when in maximal intercuspal position.”
Interocclusal Space (free-way space)
The distance between the Rest Vertical Dimension and the Occlusal Vertical
Dimension.
Plane of occlusion
“The average plane established by the incisal and occlusal surfaces of
the teeth.”
Facebow: orients the
maxilla to the rotational axis in three planes
Using a face-bow will result in the
path of opening (arc/path of opening)
on the articulator being the same as the mandible has with the TMJ
Changes to the OVD can be made on the articulator if
a face-bow record was used (and the casts have been articulated in CR)
Occlusion (definition)
The static relationship between the incising and masticating
surfaces of the maxillary and mandibular teeth or tooth analogues.
Articulation (definition)
The static and dynamic contact relationship between occlusal surfaces
of teeth during function.
Occlusion for Removable Complete Prosthodontics
Goals (5)
- Minimize trauma to supporting structures
- Preserve/maintain remaining structures
- Promote stability of the dentures
- Improve speech and esthetics
- Restore mastication to a reasonable level
Types of Occlusions for Removable Complete
Prosthodontics (3)
- Monoplane/Neutrocentric (including the variation lingualized non-balanced)
- Lingualized (balanced)
- Balanced
NOT suitable occlusal scheme for Complete Dentures:
Canine Guidance
Monoplane Occlusion (Neutrocentric) (including the variation lingualized non-balanced)
Definition: an occlusal arrangement where the posterior teeth have
masticatory surfaces that lack any cuspal height
•Posterior teeth do NOT have cusps
•Teeth are arranged on a flat plane
Other parameters of Monoplane Occlusion (4)
•Occlusal plane is parallel to the mandibular ridges and not related to the
TMJ anatomy
•Occlusal plane is completely flat; there is no curve of Spee or Wilson
•No vertical overlap of anterior teeth
•Patients will have to conform to a vertical pattern of mastication
Monoplane Occlusion
Advantages and Philosophy (3)
•Occlusal forces are centralized over the ridges and lack of cuspal inclines results
in a more forgiving occlusal scheme
•Provides the patient more freedom in mandibular movements
•Simpler technique in arranging prosthetic teeth and making occlusal adjustments
Monoplane Occlusion
Indications (2)
- Severely resorbed ridges
* Skeletal class II, III jaw relations and crossbites
Monoplane Occlusion
Disadvantages (3)
- Least esthetic scheme and limiting on the arrangement of anterior teeth
- Difficulty in food penetration (cuspless teeth)???
- Instability of prostheses in excursive movements and possibly in CR???
Monoplane Occlusion (non-balanced) •In excursive movements: (2)
posterior teeth on the working side are contacting
posterior teeth on the non-working (balancing side) are not contacting
Lingualized, non-balanced Occlusion (3)
•Cuspless mandibular posterior teeth arranged on a flat plane
•Only maxillary lingual cusps are in occlusion with central fossae areas of
mand posterior teeth
•All the advantages of the monoplane occlusion and improved esthetics
UMKC predoctoral clinic
The majority of the removable treatments (especially CDs) are done using the
Lingualized, non-balanced occlusal scheme
•We utilize cuspless mand posterior teeth arranged on a flat plane
Lingualized, non-balanced Occlusion
•Lingual cusps of maxillary posterior teeth are occluding with central
fossae areas of mandibular posterior teeth (bilaterally)
Balanced Occlusion
Bilateral simultaneous occlusal contacts of the anterior
and posterior teeth in excursive movements.
Balanced Occlusion
Bilateral simultaneous occlusal contacts of the anterior
and posterior teeth in excursive movements.
Balanced Occlusionusing anatomic posterior teeth:
Arranging denture teeth with
cusps
anatomic teeth
ways to establish a balanced occlusal scheme (2)
comopensating curve
angulation of occlusal plane
compensating curve
the AP and ML curvature of occluding surfaces and incsial edges of artificial teeth used to develop balanced occlusion
Ways to establish a Balanced Occlusal Scheme
Arrangement of Anterior Teeth
VO overlap:
HO overlap:
ANTERIOR GUIDANCE ANGLE
ANTERIOR GUIDANCE ANGLE
Decreasing the ANTERIOR GUIDANCE ANGLE:
•will facilitate establishing Balanced Occlusion
Is “Balance” Necessary?
•Numerous studies and reports on this subject in the
dental literature
•Consensus of the studies: (3)
•No patient preference
•No study could prove that Balanced Occlusion is superior
to other Occlusal Schemes
•Balanced Occlusion appears slightly more efficient in
mastication
Anterior teeth (2)
- Are arranged to satisfy esthetic and phonetic requirements
- Occlusal contacts are made on anterior teeth only in Excursive Movements in the attempt to minimize stress/forces applied to anterior ridges
