1/24: Interocclusal Recoeds Flashcards
What are two types of interocclusal records?
- Centric relation
- Maximum intercuspation
Centric relation
There is a 10mm posterior to anterior slide
What is a hinge axis?
A hypothetical line through the two mandibular condyles around which the mandible may rotate
What does criteria for optimum functional occlusion refer to?
The relationship of the max and mandibular teeth when they are in functional contact during activity of the mandible
What does unilateral eccentric contact suggest?
Laterotrusive contacts (working contact) as well as protrusive contacts should occur only on the anterior teeth
If the structures of the masticatory system are functioning efficiently and without pathology, the occlusal configuration is considered to be _____ and _______ regardless of specific tooth contacts
Physiologic; acceptable
When the elevator muscles (masseter, media pterygoid, and temproalis) function, their contraction raises the mandible such that contact is made and force is applied to the skull in three areas:
The two temporomandibular joints (TMJs) and the teeth
What does centric occlusion refer to?
- The maximal intercuspation of the teeth
- The relationship of the mandible to the maxilla when the teeth are in maximum occlusal contact, irrespective of the position or alignment of the condyle-disk assembles
What is centric relation considered to designate?
The position of the mandible when the condyles are in an orthopedically stable position
The most orthopedically stable joint position is when the condyles are located in the
Most superoanterior position in the articular fossae, fully seated and resting against the posterior slopes of the articular eminences
What is centric relation?
Maxillomandibular relationship in which the condyles articulate with the thinnest avascular portion of their respective disks with the complex in the anteriosuperior position against the shapes of the articular eminences
Centric relation is independent of _________
Tooth contact
Centric relation is considered a _________ and _________ reference position
Reliable; reproducible
What is centric relation and retruded contact position used for?
Restorative procedures all the teeth must be restored or reshaped
What is centric relation good for?
Diagnostic casts to evaluate occlusal relationships
Why are retrodiscal tissues not anatomically structured to accept force?
They are highly vascularized and well supplied with sensory nerve fibers
When force is applied to this area, there is great potential for eliciting pain and/or causing breakdown
What is the articular disc composed of?
Dense fibrous connective tissue devoid of nerves and blood vessels
What is the purpose of the articular disc?
Separate, protect, and stabilize the condyle in the mandibular fossa during functional movements
What are the muscles that stabilize the TMJs?
Elevators
What is referred to as the length of the face?
Vertical dimension
- The distance between two selected points, one on the fixed member (nose tip) and one on the movable member (chin point)
What is vertical dimension maintained by?
The occlusion of the teeth or the balanced tonic contraction of the opening and closing muscles of mandibular movements
What is the definition of vertical dimension of rest?
Vertical separation of the jaws when the opening and closing muscles of the mandible are at rest in tonic contraction
What is tactile sense?
Where patient feels most comfortable
What are phonetics?
Repeat the letter “mmm” and releax
