Occlusion - Quiz 1 Flashcards
What is the entire cranial-mandibular complex that encompasses the articulation of the teeth and the surrounding structures that produce and limit movement?
Craniomandibular Apparatus
What 2 fossae does the Temporal Bone create?
What about these fossae limit movement?
Glenoid
Mandibular
Shape
What is the portion of the mandible that Articulates in the mandibular fossa?
Condyle
The mandible is the only bone in the human body that possesses ______ axes of rotation
Two
Ligaments supporting the TMJ have what two functions?
Limit mandibular movement Protect musculature (esp. during extreme movement)
Ligaments supporting the TMJ are NOT…
3 things
Elastic
Contractile
Innervated
What does the Stylomandibular ligament limit?
Excessive Protrusion
The Sphenomandibular ligament limits ____ movement and _____ movements.
Protrusive Lateral Mandibular (lt and rt)
The position of the Temporomandibular Ligament is designed to limit the _____ rotational movement of the mandible.
Pure Hinge Axis
At what measurement is the Temporomandibular Ligament at full length?
Measured where?
15-20 mm
Incisal Edges (Max to Mb)
The Temporomandibular Disc consists of hyaline connective tissue.
False
T/F
The Temporomandibular Disc possesses innervation and has significant vascularization
False
T/F
The temporomandibular Disc interfaces between the mandible and the temporal bone
True
T/F
The temporomandibular Disc is pliable and bi-concave.
True
The collateral ligaments of the Temporomandibular Disc attach to where?
Condyle in medial and lateral position
What type of connective tissue makes up the Temporomandibular Disc?
Fibrous
What is another term for Maximum Intercuspation?
What is a “common” term?
Centric Occlusion
Habitual Occlusion
achieved by habit
Maximum intercuspation describes what aspect of tooth position?
Occlusal
T/F
In Maximum Intercuspation the teeth are in the most comfortable position
True
In terms of achievability and reproducability, describe Maximum Intercuspation.
Easily Achievable
Not always Reproducible
Only _____% of the population have no centric relation to maximum intercuspation discrepancy or slide.
> the centric relation position is anterior, superior and slightly lateral to the maximum intercuspation position
15%
At what point will maxillary and mandibular teeth come together most completely?
Maximum Intercuspation
When the teeth come fully together what is happening to the condyles?
What direction would that be?
Must move out of ideal position
Anterior, Superior, and Slightly lateral to Maximum Intercuspation position
T/F
For patients with a slide, after the first occlusal contact in centric relation is obtained the patient continues to close and slide on inclines of anterior teeth
False
*Posterior Teeth
T/F
The first tooth contact is usually on two or more anterior teeth
False
*Posterior teeth
What is implied by the term Canine Protected Articulation?
Only canines touch during complete extent of Lateral Movement
What type of Occlusal Scheme is Group Function Occlusion?
Secondary
most practical approach
What type of occlusal scheme is ideal?
What type do older patients usually exhibit?
Canine Protected Articulation
Group Function
What occurs simultaneously in Ideal Occlusion?
Centric relation and maximum intercuspation
In Ideal Occlusion, how many teeth contact simultaneously?
All of them
What occurs in Posterior Teeth in Ideal Occlusion?
2 things
Long axis occlusal forces
Posterior tooth contacts dominant
In Ideal Occlusion, what guides eccentric movements?
Anterior teeth
T/F
In Ideal Occlusion, Crossover Contacts are seen in Posterior teeth.
False
*no crossover contacts
The proper alignment of the articular disc is _____ and the thinnest, and most articulated portion is in the _____ section
Slightly Anterior
Middle
Name 4 actions of the Masseter
Elevation
Clenching
Protrusion
Lateral movement
*NOT primary protrusive/lateral movement muscle
T/F
The Masseter is the primary muscle for Protrusion and Lateral Movement
False
3 major/1 minor function of the Medial Pterygoid normal not-primary primary parafunctional
Elevation
Protrusion (not primary)
Mediotrusive (primary)
Clenching (parafunctional)
What is the primary muscle of mastication involved with Protrusive and Lateral movements?
Inferior Head - Lateral Pterygoid
T/F
The Inferior Head of the Lateral Pterygoid can be palpated
False
The inferior Head of the Lateral Pterygoid is active during ____ movement of the mandible
Opening
What is the most frequent muscle of mastication to exhibit spasm due to occlusal dysfunction?
Inferior Head Lateral Pterygoid
The accessory muscles of mastication (geiohyoid, mylohyoid, digastric, stylohyoid) have what 5 collective functions?
Elevate hyoid Elevate base of tongue Depress mandible when hyoid fixed Assist in cranium stabilization (during Mb mvmt) Speaking/Swallowing control
Describe 4 aspects of Normal Early Jaw Opening
Inferior head Lat. Pterygoid contracts
(controlled, slow, consistent)
Condyle moves anteriorly
(beginning posterior border art. eminence travels downward)
Articular Disc Moves With Condyle
(sup. lat. Pterygoid minimally contracts)
Superior Retrodiscal Tissues Slight Tautness
Match the following Muscles to vectors: Anterior Temporalis Posterior Temporalis Masseter Posterior Digastric Inferior heat Lateral Pterygoid
Superior and slightly anterior Posterior and slightly superior Superior and slightly anterior Superior and Posterior Anterior
Which of the following positions during the eight stage sequence of normal condyle-disc movement occurs or is obtained first?
Centric Relation
Regarding the Functional Elevators for the muscles of mastication, Unilateral contraction of which muscle will produce mediotrusive movement?
Medial Pterygoid
The bilamminar region of the Retrodiscal Tissue is loose vascular tissue which serves as what attachment for the articular disc?
(also fills with fluid)
Posterior
The retrodiscal area splits between the inferior and superior retrodiscal ligaments _____ to the articular disc.
Posterior
When will orthopedic stability be achieved in occlusion?
Intercuspal position is in Harmony with Musculoskeletal position of Condyles in fossa
What will the elevator muscles do when the teeth are apart?
Maintain condyles in Muculoskeletally stable positions
