Terms Flashcards
Maximal Intercuspal Position
The complete intercuspation of the opposing teeth, independent of condylar position.
Best fit of teeth exclusive of condylar position
Maximal intercuspal position
Maximal Intercuspation is AKA
Maximal intercuspal position
Centric occlusion
The occlusion of the opposing teeth when the mandible is in centric relation.
T/F: Centric occlusion may not agree with MIP.
TRUE
Centric relation is
the maxillomandibular relationship in which the condyles articulate with the thinnest avascular portion of their respective disks with the complex in the anterior-superior position against the shapes of the articular eminences. This position is independent of tooth contact. This position is clinically discernible when the mandible is directed superior and anteriorly. It is restricted to a purely rotary movement about the transverse horizontal axis.
T/F: centric relation depends on tooth contact.
FALSE.
Describe position of mandible is directed to clinically discern centric relation?
Superior and anteriorly.
Centric position is
the position of the mandible when the jaws are in centric relation.
Retruded contact position
Guided occlusal relationship occurring at most retruded position of the condyle in the joint cavities. A position that may be more retruded then the centric relation.
Postural position
Any mandibular relationship occurring during minimal muscle contraction.
Occlusal vertical dimension
Distance measured between two points when the occluding members are in contact.
Rest vertical dimension
Distance between two selected points (one on middle of face or nose and other on lower face or chin) measured when the mandible is in physiologic rest position.
Physiologic rest position
The mandibular position assumed when the head is in an upright position and the involved muscles, particularly the elevator and depressor groups, are in equilibrium in tonic contraction and the condyles are in a neutral, unstrained position.
Interocclusal distance
distance between occluding surfaces of the maxillary and mandibular teeth when the mandible is in a specified position.
Interocclusal rest space
Difference between the vertical dimension of rest and the vertical dimension when in occlusion.
Transverse horizontal axis is AKA
hinge axis
Transverse horizontal axis is
an imaginary line around which the mandible may rotate in the sagittal plane.
Hinge movement is AKA
rotation.
Hinge movement is
the movement in space characterized by two divergent points moving around a central axis of rotation
Translatory Movements
Movement in space characterized by linear motion with no axis of rotation
Border movements
Most extreme positions to which the mandible is able to move - generally considered to be relatively stable and reproducible except under certain pathological conditions. These movements have been described from the sagittal, frontal and horizontal planes. Border movements are not affected by head or body posture. It is important to be abel to visualize border movements from these three perspectives and understand the structures that limit jaw movement.
T/F: border movements are affected by head or body posture.
FALSE.
Posselt Diagram of Border Movements
Described in three planes - sagittal, horizontal and frontal - when combined describe a 3D envelope of motion that represents the maximum range of movement of the mandible. Varies individual to individual. Remember: is a tracing of movements of the mandibular incisal point movements.
Working side
the side toward which the mandible moves in a lateral excursion
Nonworking side
The side of the mandible that moves toward the median line in a lateral excursion. The condyle on that side is referred to as the nonworking side condyle
Balanced articulation/occlusion
The bilateral, simultaneous, anterior and posterior occlusal contact of teeth in centric and eccentric positions.
Mutually protected articulation/occlusion
Occlusal scheme in which the posterior teeth prevent excessive contact of the anterior teeth in maximum intercuspation and the anterior teeth disengage the posterior teeth in all mandibular excursive movements
Anterior guidance
The influence of the contacting surfaces of anterior teeth on tooth limiting mandibular movements
Group function
Multiple contact relations between the maxillary and mandibular teeth in lateral movements on the working side whereby simultaneous contact of several teeth acts a group to distribute occlusal forces.
Protrusion
A position of the mandible anterior to centric relation.
Protrusive movement
mandibular movement anterior to centric relation.
Lateral excursion
Sideward movement of the mandible characterized by: left lateral excursion (rotation of left/working side condyle. Forward, inward and downward translation of non-working condyle.)
Right lateral excursion: rotation of the right/working side condyle. Forward, inward and downward translation of the non-working condyle
Left lateral excursion
Rotation of left or working side condyle. Forward, inward and downward translation of nonworking condyle
Right lateral excursion
Rotation of right or working side condyle. Forward, inward and downward translation of non-working condyle.
Laterotrusion
Movement of the condyle on the working side in the horizontal plane. This term may be used in combination with terms describing condylar movement in other planes.
Mediotrusion
Movement of the condyle medially.
Bennett Movement
Bodily shift of the mandible toward the working side during lateral excursion. Movement caused by restraining influence of TM ligaments and medial wall of glenoid fossa on the non-working side. Average lateral movement is 0.75mm.
Average lateral movement in mm?
0.75mm
What causes Bennett movement?
Restraining influence of TM ligaments and medial wall of glenoid fossa on the non-working side.
