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49 Cards in this Set
- Front
- Back
Pure rotation of the mandible involves which two planes of movement?
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Frontal & Sagittal
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What is the plane in which the mand. moves up and down?
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Frontal
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What is the plane in which the mand. moves side to side?
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Horizontal
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What is the plane in which the mand. moves Forwards and backwards?
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Sagittal
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What are the five factors of mandibular movement?
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1. Initiating position (centric relation)
2. Types of motion 3. Direction of motion 4. Degree of movement 5. Clinical significance of movements |
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What is the most stable and most easily reproduced position?
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Centric relation
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What are the types of motion in mandibular movement?
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Rotation and translation
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What is another name for Centric occlusion
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Intercuspal position
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What is another name for Centric relation?
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Terminal hinge axis
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What is another name for rest position?
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Postural position
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What is the order of height generally for:
Centric Relation Resting position and Centric Occlusion |
Centric Occlusion
Centric Relation Resting Position |
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What is another name for the terminal hinge movement of the mandible?
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Rotation
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What movements primarily allow for food mastication?
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Lateral contacting movements
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Posselt's envelope of motion is viewed in what plane?
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Mid-sagittal
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Border movements of the mandible are recorded in what plane?
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Horizontal
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What is the contact of teeth during the resting or postural position?
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Not present
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What is the term used to describe the absence of contact during postural position?
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Freeway space or interocclusal distance
(2-6 mm avg.) |
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Which jaw position is a muscle guided position?
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Rest or postural position
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What is defined as maximum intercuspation of the teeth and a tooth guided position?
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Centric occlusion (Intercuspal Position)
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What is the usual reflex cited as the basis for the postural position of the mandible?
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Tonic Stretch reflex of the levators
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What determines Centric relation?
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Condyles are positioned in the uppermost part of the mandibular fossa and related anteriorly to the distal slope of the articular eminence
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Guided movements of the jaw in opening and closing that do not have translation are referred to as what?
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Hinge axis movements
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What is considered to be a ligament guided position?
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Centric Relation
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When a mandibular movement to the right is performed, which condyle moves forward, downward, and medially?
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Non-working condyle (left)
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Lateral movement of the Mand. is known as what?
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Transtrusion
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The lateral movement of the working or rotating condyle
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Laterotrusion
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The medial movement of the balancing or nonworking condyle
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Mediotrusion
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In a lateral movement what is the motion of the balancing non-working condyle?
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Downward, forward, and medially
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What is the motion during a lateral movement for the working condyle?
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lateral (rotation around a vertical axis and translating laterally)
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Due to the mand. being solid bone, the amount that the non-working condyle moves medially determines how far the working condyle moves laterally. What is this known as?
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Bennett Movement
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The side that moves away from the midline and toward the lateral excursion is known as what?
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Working side (laterotrusive)
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The side that moves toward the midline during a laterotrusive movement is what?
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Non-working side (mediotrusive0
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Occurs frequently throughout the day and is an important function that rids the mouth of saliva and helps moisten the oral structures.
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Empty Mouth Swallowing
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Which muscles contract during normal swallowing?
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Masseter muscles
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Tooth contacts are of _____ _____ in swallowing than in chewing, but there is wide variation in frequency and duration from one person to another.
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Longer Duration
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During a working side movement of the mand. the oblique ridge of a max. first molar passes through which sulcus of a permanent mandibular first molar?
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Distobuccal sulcus
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In intercuspal position, the _____ _____ _____ of the max. first molar opposes the _____ _____ of the mand. first molar.
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mesiobuccal triangular ridge
mesiobuccal groove |
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In a working side movement, the _____ _____ of the max. first molar passes through the _____ _____ of the mand. first molar.
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mesiolingual cusp
lingual groove |
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In a working side movement, the _____ _____ of the max. secpnd molar passes through the _____ _____ of the mand. second molar.
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mesiobuccal cusp
facial groove |
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What movement is accomplished when the mand. is moved straight forward until the max. and mand. incisors contact edge to edge?
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Protrusive Movement
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What is typical of the protrusive movement symmetry?
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Bilaterally symmetrical
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What teeth are most likely to fracture during protrusive movements?
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Incisors (esp. restorations on those teeth)
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What is the movement of the condyles during a protrusive movement?
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Downward and forward
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What occurs as the mand. moves from a pure protrusive movement from maximum intercuspal position to a maximum protruded position?
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Translation
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What is the movement of the condyles in a retrusive movement?
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Backward and Up
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If arrows indicating movements are straight and pointing buccally they are ...
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Right working
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If arrows indicating movements are straight and pointing lingually they are ...
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Left Working
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The side to which the mand. moves is known as the _____ _____.
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Working Side
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The side from which the Mand. is moving from is known as the _____ _____.
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Non-working side
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