Occlusion Flashcards
What is the occlusal vertical dimension (OVD)?
The distance between 2 selected anatomic or marked points when in maximal intercuspal position
What is the physiologic 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 is the interocclusal space (free-way space)?
The distance between the Rest Vertical Dimension and the Occlusal Vertical Dimension
What is the purpose of a facebow?
- Orients the maxilla to the rotational axis in three planes
- Using a face-bow will result in the 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.
Why do you use centric relation for edentulous patients?
- can be verified and is repeatable
- jaw position is independent of teeth position
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?
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.
What are the five goals of occlusion for removable complete prosthodontics?
- 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 three types of occlusion for removable complete prosthodontics?
- monoplane/neutrocentric
- lingualized
- balanced
What is monoplane occlusion?
an occlusal arrangement where the posterior teeth have masticatory surfaces that lack any cuspal height
What are the characteristics of monoplane occlusion?
- posterior teeth do NOT have cusps
- teeth are arranged on a flat occlusal plane
- occlusal plane is parallel to the mandibular ridges
- no vertical overlap of anterior teeth
What are the advantages of monoplane occlusion?
- Occlusal forces are centralized over the ridges and lack of cuspal inclines results in a more forgiving occlusal scheme
- more freedom in mandibular movements
- Simpler technique in arranging prosthetic teeth and making occlusal adjustments
What are the disadvantages of monoplane occlusion?
- Severely resorbed ridges
- Skeletal class II, III jaw relations and crossbites
- Least esthetic scheme and limiting on the arrangement of anterior teeth
- Difficulty in food penetration
- Instability of prostheses in excursive movements
