2/12: Occlusion for CRP Flashcards
What is occlusal vertical dimensions?
Distance between 2 selected anatomic or marked points when in maximal intercuspal position
What is physiological rest 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
What should the mm be of interocclusal space/distance?
Approx. 2-4mm
What is the interocclusal space (freeway space)?
The distance between the Rest Vertical Dimension and the Occlusal Vertical Dimension.
What does the facebow orient?
The maxilla to the rotational axis in three planes
What does using a facebow result in?
Path of opening (arc/path of opening) on the articulator being the same as the mandible has with the TMJ
What is 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
What is centric relation for edentulous patients used as?
The reference position on which the casts are articulated
- used because it can be verified and it is repeatable
- jaw position and it is independent of teeth position
When are master casts articulated?
After using centric relation records
What is the plane of occlusion?
The average plane established by the incisal and occlusal surfaces of the teeth
What is the definition of occlusion?
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
What are the goals of occlusion for CRP?
- Minimize trauma to supporting structures
- Preserve/maintain remaining structures
- Promote stability of the dentures
- Improve speech and esthetics
- Restore mastication to a reasonable level
What are the types of occlusions for CRP?
- Monoplane/Neutrocentric (including the variation lingualized non-balanced)
- Lingualized
- Balanced
What is monoplane occlusion (neutrocentric)?
An occlusal arrangement where the posterior teeth have masticatory surfaces that lack any cuspal height
- posteiror teeth do NOT have cusps
- teeth are arranged on a flat occlusal plane
In monoplane occlusion, what is the occlusal plane parallel to?
Mandibular ridges and NOT related to the TMJ anatomy
What are other parameters of monoplane occlusion?
- 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
What does the centralization of occlusal forces result in?
More forgiving occlusal scheme
What are monoplane occlusion advantages?
- 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
What are monoplane occlusion indiciations?
Severly resorbed ridges
Skeletal class II, III jaw relations and crossbites
What are monoplane occlusion disadvantages?
- 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???
What are excursive movements of non-balanced monoplane occlusion?
- posterior teeth on the working side are contacting
- posterior teeth on the non-working (balancing side) are not contacting
What is lingualized, non balanced occlusion?
- 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
The majority of UMKC prosthodontic treatment use what?
Lingualized, non-balanced occlusal scheme
- cuspless mand posterior teeth arranged on a flat occlusal plane
What is lingualized, non balanced occlusion?
Lingual cusps of maxillary posterior teeth are occluding with central fossae areas of mandibular posterior teeth (bilaterally)
What is biateral occlusion?
Bilateral simultaneous occlusal contacts of the anterior and posterior teeth in excursive movements
What are types of occlusion for removable complete prosthodontics?
- Monoplane/Neutrocentric
- Lingualized (type of balanced occlusion where only the L cusps of
the max teeth occlude with the mand teeth in CR/MIP and
excursive movements) - Balanced
When arranging anterior teeth, what are ways to establish a balanced occlusal scheme?
INCREASE VO overlap -> INCREASE anterior guidance angle
INCREASE HO overlap -> DECREASE anterior guidance angle
What does decreasing the anterior guidance angle facilitate?
Establishing balanced occlusion
What are 5 factors that affect balanced occlusion?
- Condylar Inclination
- Incisal Guidance
- Occlusal Plane Inclination
- Compensating Curve
- Cuspal Inclination
Is “balance” necessary?
- Numerous studies and reports on this subject in the dental
literature - Consensus of the studies:
No patient preference
No study could prove that Balanced Occlusion is superior to other
Occlusal Schemes
Balanced Occlusion appears slightly more efficient in mastication
What are anterior teeth arranged to satisfy?
Esthetic and phonetic requirements
Occlusal contacts made on anterior teeth only in excursive movements in the attempt to do what?
Minimize stress/forces applied to anterior ridges
