Flashcards in Occlusion Test 1 Deck (72):
In the temporomandibular ligament:
What limits normal rotational opening movement?
Outer Oblique Portion
In the temporomandibular ligament:
What limits posterior movement of the Condyle and Disc?
Inner Horizontal Portion
In Centric Relation, the condylar position does NOT need any tooth contact to be obtained
Where is the Condyle positioned in proper Centric Relation?
Where is the disc?
(between what 2 things is the disc?)
Superior and Anterior
Properly interposed between Condyle and Temporal Bone
What does the Centric Relation of the mandibular position describe?
Most stable position
What is the position of the mandible that displays minimal tonus?
The Centric Relation exhibits articulation on the thickest portion of the articular disc
In Maximum Intercuspation in Clinical conditions, what determines the occlusal position?
If centric relation and maximum intercuspation do not coincide, the patient will...
Have a "slide"
In Maximum Intercuspation in Clinical Conditions, the occlusal forces will concentrate down the long axis of posterior teeth
It will also be dynamic and change throughout a patient's life.
What are 3 normal functional activities of the Temporalis?
Positions mandible to obtain centric relation
The temporalis causes clenching when muscle is overused and produces lateral movements of the mandible
What establishes the mid-most position of the mandible at the Centric Relation?
It is the relationship of the medial pole of the condyle and the...
Medial Pterygoid on One Side
What makes the normal curve of occlusion possible?
Medial Pole of Condyle prevents Posterior Teeth from moving TOWARD the midline by STEEP medial wall of fossa.
Superior Head of the Lateral Pterygoid
2 Normal functions:
Sustains Consistent position Articular Disc
Progressively active during closing
Spasms due to occlusal dysfunction
The Superior Head of the Lateral Pterygoid works with action/inactivity of the....
Inferior head lateral pterygoid
The clinician can palpate some portion of the Superior Head of the Lateral Pterygoid even through it is deep in placement and mostly covered by the Medial Pterygoid.
The Superior Head of the Lateral Pterygoid is progressively active during opening movement of the mandible and is deep in placement and is mostly covered by the masseter, so the clinician cannot palpate some portion of the muscle
*progressively active during Closing
**covered by the Medial Pterygoid
The mylohyoid muscle will slightly close the mandible
*slightly depress (open)
Name 3 actions of the Mylohyoid muscle
Slightly depress (open) mandible
Elevate hyoid, tongue, floor oral cavity
What occurs during normal jaw opening movement, during the latter stages of mandibular opening?
The inferior head of the lateral pterygoid is at maximum point of contracture
In late normal jaw opening, the condyle has moved anteriorly as far as possible, the articular disc is posterior, and the superior retrodiscal tissues are at maximum tautness
Which of muscle of mastication exhibits a superior and slightly medial force vector in the frontal plane?
*superior and slightly medial = Mediotrusive
The temporomandibular joint is innervated by one nerve that provides motor innervation and a different nerve that provides sensory innervation to individual muscles
The same nerve provides motor and sensory innervation to the temporomandibular joint
What provides most of the innervation to the Temproromandibular joint?
Additional innervation provided by what 2 nerves branching from V3?
Deep temporal n.
What provides the primary vascularization to the temporomandibular joint?
Superficial Temporal branch External Carotid Artery
From where does the mandibular condyle receive its vascular supply?
Through marrow spaces from
Inferior Alveolar a.
Why does the Maxillary arch dominate/influence the Mandibular arch?
Larger (starting distal 3rd Molar)
Which arch has more to do with esthetics?
Esthetics are embedded more in the mandibular arch than in the maxillary arch, because the smile line is extremely evident with mandibular anterior teeth
The maxillary arch is smaller than in the mandible, from the distal of a third molar on one side through the middle of each tooth to the third molar on the other side
The maxillary arch is more narrow, or less in measurement from right to left sides
Regarding the intra-arch alignment of teeth, the maxillary teeth having only one namesake in the opposing arch are the?
What tooth on the maxillary arch only contacts one occlusal tooth?
Maxillary 3rd Molars
The ideal plane of occlusion is NOT flat as it allows too many contacts on posterior teeth
The proper plane of occlusion will permit what?
Simultaneous functional contacts in Controlled areas
What permits maximum use of tooth contacts during function?
How are teeth positioned in the arches to coordinate varied degrees of inclination?
The ideal plane of occlusionit is flat, is a curved plane that allows for too many contacts on most posterior teeth on both sides of the mouth, is a flat plane that permits maximum use of tooth contacts during function
When examining the distance between the condyle and the first premolars on one side of the oral cavity, the occlusal forces exerted on the First Premolars are approximately ___ per cent less than those forces exerted on the Third Molars
Where do occlusal contacts ideally occur?
ideally: Between cusp tip and depth of fossa
or: cusp tip and flat surface
*flat surface is More Stable
Where should contacts not occur?
Define Class 2 Malocclusion:
(2 main things)
Distal 1st Molar and Canines
Excessive Anterior horizontal overlap
When a patient is in static or stationary occlusion, occlusal contacts should occur between a cusp tip and?
The depth of an opposing fossa
The mesiolingual cusp of the maxillary first molar = mesial fossa of the mandibular first molar
Match the following:
Lingual cusp of the Max 1PM
Lingual cusp of the Max 2PM
Mesiolingual cusp Max 1M
Distolingual cusp Max 1M
Mesiolingual cusp Max 2M
Distolingual cusp Max 2M
Distal marginal ridge/distal fossa Mb 1PM
Distal marginal ridge/distal fossa Mb 2PM
Central fossa Mb 1M
Distal marginal ridge/distal fossa Mb 1M
Central fossa Mb 2M
Distal marginal ridge/distal fossa Mb 2M
The condition in which maximum intercuspation is on occlusal inclines, leading to excessive wear, fractures, etc is called?
During a right lateral movement of the mandible, the left side of the mandible is termed the?
The pathway of the maxillary cusps positioned over the mandibular teeth which is parallel to the mandibular molar lingual groove and travels toward the tongue is termed?
The Working Pathway of Maxillary Cusps positioned over the Mandibular teeth travels in what direction?
Parallel to Lingual Groove
Travels Toward the Tongue
Regarding maxillary cusp positioning over Mandibular teeth, the nonfunctional area is ____ than the functional area.
The functional pathway is all the area the mandible can _____
The non-functional pathway is the area the mandilbe ________.
Move in to
Cannot move into
The non-functional pathway is the area that the mandible cannot normally move into
What direction will the Mesiofacial Cusp on a Left Mb 1M travel during a Non-working movement?
(direction and through which embrasure)
Max 1M mesial marginal ridge Diagonally through Lingual embrasure between Max 2PM and Max 1M
Diagram Max 1M, arrow pointing outward. What Mb movement indicated?
Diagram Max 1M, arrow pointing inward (diagonally and posteriorly over distolingual cusp toward lingual). What Mb movement indicated?
When viewing a pantographic tracing of mandibular border movements from a sagittal view at the level of the mandibular central incisors, which position exhibits tooth contact?
When viewing a pantographic tracing of mandibular border movements from a horizontal view at the level of the mandibular central incisors, which position is the most anterior?
When viewing a pantographic tracing of mandibular movement at the condylar level on the left side, the long sloping arc that travels mediotrusively and anteriorly is called the?
Non-working condyle pathway
What happens during the first part of the lateral movement of the mandible?
The movement is measured as the distance between what 2 things?
Medial pole Non-working condyle moves
(down articular eminence against medial wall of fossa)
Mesial wall glenoid fossa
If condylar guidance was the only vertical determinant of occlusion, what would the Cusp Angles need to be in order to avoid collision in eccentric movements?
Less than angle of Articular Eminence
If a patient has a loose temporomandibular ligament on their working side and a sizable distance between the medial wall of the fossa and medial pole of the condyle on the non-working side, this would cause?
The cusp heights on the non-working side to be shorter
Anterior guidance is a function of the relationship between the maxillary and mandibular ANTERIOR teeth.
Anterior guidance consists of the vertical and horizontal overlaps as measured at the Anterior teeth
What happens to the Anterior Guidance angle when Vertical overlap increases?
(when horizontal overlap remains unchanged)
Anterior Guidance Angle Increases
In a patient exhibiting both anterior and posterior controlling factors of 45 degrees each, what would be the angle of the mandibular first premolar as it moves away from the horizontal reference plane when the mandible is opened?
As the plane of occlusion becomes ______ parallel to the angle of the articular eminence, the posterior cusps will need to be _____ in order to avoid collisions with each other.
The less parallel the horizontal reference plane is to the Condylar Guidance Angle, the ______ the cusps _____ be
Regarding the timing of mandibular lateral translation, the cusps on the non-working side must be shorter if?
The immediate sideshift has a noticeable measurement
The Direction and Location of _____ and _____ on occlusal surfaces are influenced by Horizontal Determinants
Horizontal Determinants influence _____ of cusps during eccentric movements (cusps pass between ridges and over grooves)
When examining mandibular movement on the Non-working side, the closer the tooth is to the midline, the _______ the angle between the laterotrusive and mediotrusive pathways.
When contemplating the effect of anterolateral and posterolateral translation of the Working condyle, the more posterolateral the movement of the working condyle, the _______ is the angle formedby the mediotrusive and laterotrusive pathways.