Occlusion Quiz 1: SLIDES 10-20 Flashcards
SLIDE 10: Terms for Describing Eccentric Movements of the Mandible (any kind of movement away form the centric movement)
Lateral movements of the mandible:
During a left lateral mandibular movement, the _________ side is considered to be on the “____________ side” or classified as the “______________ (working or non-working) side.
During a left lateral mandibular movement, the right side is considered to be on the “balancing side” or classified as the “non-working” side.
– left side is considered the working side …
If it’s right lateral mandibular movement, then it’s vice versa.
SLIDE 11: Summary of characteristics of an ideal occlusion:
- Centric relation and maximum intercuspation occur ______________ (simultaneously or nonsimultaneously)
- Which teeth contact simultaneously
- All occlusal forces on posterior teeth are directed down where?
- __________ tooth contacts dominate over __________ tooth contacts
- All eccentric movements are guided by which teeth?
- – Should there be any crossover contacts on posterior teeth seen?
- Centric relation and mximum intercuspation occur simultaenously
- All teeth contact simultaneously
- All occlusal forces on posterior teeth are directed down the LONG AXIS OF THE TEETH
- Posterior tooth contacts dominate over anterior tooth contacts
- All eccentric movements are guided by the anterior teeth
- NO crossover contacts on posterior teeth should be seen.
SLIDE 12: MUSCLES OF MASTICATION: Orgins, Insertions and Actions:
The emphasis of this lecture is primarily on the _________ (origin, insertion, or action) of the muscles of mastication, as an eventual precursor to our understanding of _________________ ________________ dysfunction. Actions of the muscles will either be described as ____________ vs. ________________ (_________________) activities.
The emphasis of this lecture is primarily on the action of the muscles of mastication, as an eventual precursor to our understanding of temporomandibular occlusal dysfunction. Actions of the muscles will either be described as normal vs. parafunctional (abnormal) activities.
** SLIDE 13: MASSETER
- -What two portions does the masseter muscle display?
- What kind of muscle (strength-wise) is the masseter.
- IT has some potential for ____________.
- -Origin of Masseter?
- Insertion of masseter?
- The masseter muscle displays SUPERFICIAL and DEEP portions
- The messeter is a very powerful muscle
- It has some potential for OVERUSE.
- -Origin of masseter: Zygomatic arc
- Insertion: at the angle and inferior border of mandible
SLIDE 13: MASSETER.
ACTIONS of the masseter:
- Elevate the mandible in a ___________ direction to eventually _________ the maxillary teeth.
- Causes _________ (opening or clenching) of the teeth
- Aids on _______________ (protrusive or retrusive) movement
- Minimally aids in _____________ (lateral or vertical) movement.
1) Elevate the mandible in a SUPERIOR direction to eventually contact the maxillary teeth (This is considered normal functional activity)
2) Causes CLENCHING of the teeth. (This is considered parafunctional activity)
3) Aids in PROTRUSIVE movement (The masseter is not the primary muscle to produce protrusive movement)
4) Minimally aids in LATERAL movement. (The masseter is a very minor player to produce lateral movement.
SLIDE 14: Medial Pole of Condyle and Medial Pterygoid Muscle (non working side of condyle)
– The relationship of the _________ ___________ of the condyle on the ________ _________ muscle on one side establishes the ________ (upper, lower or mid-most) position of the mandible at CENTRIC RELATION.
– The relationship of the medial pole of the condyle on the medial pterygoid muscle on one side establishes the mid-most position of the mandible at ____________ relation.
SLIDE 14: Medial Pole of Condyle and Medial Pterygoid Muscle (non working side of condyle)
The ____________ curve of occlusion is possible because the interaction of the ____________ pole of the condyle with the _________ __________ (medial or distal) wall of the fossa prevents the mandibular ______________ (posterior or anterior) teeth from moving straight ____________ (vertically or horizontally) toward the midline
The NORMAL curve of occlusion is possible because the interaction of the medial pole of the condyle with the steep mesial wall of the fossa prevents the mandibular posterior teeth from moving straight horizontally toward the midline.
SLIDE 14: Medial Pole of Condyle and Medial Pterygoid Muscle (non working side of condyle)
As a result in ideal patients, ____________ (maxillary or mandibular) ___________(lateral or vertical) translation (or direct ___________ (lateral or vertical movement of the mandible toward the ___________ left, right or midline)) is ____________ (possible or impossible) from the fully seated positions of the condyle in the fossa.
As a result in ideal patients, MANDIBULAR LATERAL TRANSLATION ( or DIRECT LATERAL MOVEMENT of the mandible toward the midline) is impossible from the fully seated positions of the condyle in the fossa.
SLIDE 15: Muscles involved in seating condyles in the fossa (T/F) question.
List the three muscle that contribute to NORMAL SEATING of the condyles in the fossa.
– Of the three, the ________________ muscle contributes most to this condylar seating. As a result, the _________ muscle is most often associated with obtaining the ____________ (centric or non-centric) relation position of the condyles in the fossa.
- TEMPORALIS, MASSETER, and MEDIAL PTERYGOID all contribute to NORMAL seating of the condyles in the fossa.
- Of the three, the TEMPORALIS contributes most to this condylar seating.
- As a result, the TEMPORALIS muscle is most often associated with obtaining the CENTRIC relation position of the condyles in the fossa.
Note: The LATERAL PTERYGOID is NOT involved in seating of the condyles in the fossa.
SLIDE 16: Lateral Pterygoid – SUPERIOR HEAD
The superior head of the lateral pterygoid in comprised of very ___________ (slow or fast) ACTING MUSCLE FIBERS, implying that the motion is designed to be expressed in an extremely __________ ( SHORT OR LONG) and very __________ (Controlled or noncontrolled) movements.
The superior head of the lateral pterygoid in comprised of very SLOW ACTING MUSCLE FIBERS, implying that the motion is designed to be expressed in an extremely SHORT and very CONTROLLED movements.
SLIDE 16: Lateral Pterygoid – SUPERIOR HEAD
The SUPERIOR head of the lateral pterygoid is ____________ (smaller or larger) than the INFERIOR head.
SMALLER
SLIDE 16: Lateral Pterygoid – SUPERIOR HEAD
The insertion of the superior head of the lateral pterygoid is located at the ___________ (head or neck) or the condyle and the ____________ (anterior/medial or posterior/distal) surface of the articular disc.
The insertion of the superior head of the lateral pterygoid is located at the neck or the condyle and the anterior/medial surface of the articular disc.
SLIDE 16: Lateral Pterygoid – SUPERIOR HEAD
ACTIONS:
- It maintains a ____________ and ___________ position of the ARTICULAR disc.
- It is progressively ACTIVE during _____________ (closing or opening) movement of the mandible
- It frequently displays a ____________ (spasm or tonicity) as a result of some types of occlusal dysfunction.
- This muscle works in concert with the action and inactivity of the _______________ (superior or inferior) head of the lateral pterygoid.
- This muscle of mastication is _____________ (superficial or deep) in placement and is mostly covered by the _________ (medial or lateral pterygoid), but the clinician can ___________ some portion of the muscle.
ACTIONS:
- It maintains a sustainable and consistent position of the ARTICULAR disc.
- It is progressively ACTIVE during closing movement of the mandible
- It frequently displays a spasm as a result of some types of occlusal dysfunction.
- This muscle works in concert with the action and inactivity of the inferior head of the lateral pterygoid.
- This muscle of mastication is deep in placement and is mostly covered by the medial pterygoid, but the clinician can palpate some portion of the muscle.
SLIDE 17: Digastric Muscle Complex:
– The ___________ (anterior or posterior) head ASSISTS in producing mandibular ___________ (protrusion or retrusion) ( although not anywhere near the degree seen in the temporalis)
the POSTERIOR head ASSISTS in producing mandibular RETRUSION.
SLIDE 17: Digastric Muscle Complex:
The anterior head is _____________ (minimally or mainly) INVOLVED in producing mandibular retrusion
The anterior head is MINIMALLY involved in producing mandibular retrusion (less so than the posterior digastric)
SLIDE 17: Digastric Muscle Complex:
Both heads of the digastric muscle complex will ____________ (depress or elevate) the hyoid bone (when the teeth are together) during ____________ (relaxation or swallowing)
Both heads of the digastric msucle complex will ELEVATE the HYOID bone during SWALLOWING.
SLIDE 17: Digastric Muscle Complex:
Muscle spasms are seen more commonly in the _____________ (anterior or posterior digastric muscle than the other.
Muscle spasms are seen more commonly in the POSTERIOR DIGASTRIC MUSCLE than the ANTERIOR digastric muscle
SLIDE 18: MYLOHYOID MUSCLE
ACTIONS OF THE MYLOHYOID MUSCLE:
– The MYLOHYOID MUSCLE will _____________ (largely or slightly) depress the mandbile
The MYLOHYOID muscle will SLIGHTLY depress the mandible
SLIDE 18: MYLOHYOID MUSCLE
ACTION:
The mylohyoid muscle will ________ (elevate or depress) the hyoid, the _________( roof or floor) of the oral cavity, and the TONGUE.
The mylohyoid muscle will ELEVATE the hyoid, the FLOOR of the oral cavity, and the TONGUE
SLIDE 18:
Which muscle is very important during speaking and swallowing?
MYLOHYOID MUSCLE
SLIDE 19: NORMAL JAW OPENING MOVEMENT
– Early mandibular ________ (opening or closing) movement occurs in a close proximity to the _________ relation position.
Early mandibular opening movement occurs in a close proximity to the CENTRIC relation position.
SLIDE 19: NORMAL JAW OPENING MOVEMENT
- The following actions occur during early mandibular opening movement:
- the ___________ (inferior or superior) head of the lateral pterygoid CONTRACTS
- In what kind of manner: _______ (controlled or noncontrolled), ______ (fast or slow) and _______ (consistent or inconsistent) manner.
The INFERIOR head of the lateral pterygoid contracts.
This is in a controlled, slow and consistent manner.
SLIDE 19: NORMAL JAW OPENING MOVEMENT
– The following actions occur during early mandibular opening movement:
The condyle will move ____________ (posteriorly or anteriorly)?
– It actually progresses down the slope of the articular eminence at the __________ (beginning or later) of the __________(anterior or posterior) border of the eminence.
The condyle will move ANTERIORLY.
- It actually progresses down the slope of the articular eminence at the BEGINNING of the POSTERIOR border of the eminence.
SLIDE 19: NORMAL JAW OPENING MOVEMENT
– The following actions occur during early mandibular opening movement:
The articular disc will move with the ____________?
– This is as a result of the __________ (superior or inferior) head of the lateral pterygoid muscle _________ (minimally or maximally) contracting.
The articular disc will move with the CONDYLE
— This is as a result of the SUPERIOR head of the lateral pterygoid muscle MINIMALLY contracting.
SLIDE 19: NORMAL JAW OPENING MOVEMENT
– The following actions occur during early mandibular opening movement:
The __________ ____________ tissues undergo a slight tautness.
The SUPERIOR RETRODISCAL TISSUES undergo a slight tautness.
SLIDE 20: Muscle VECTORS in SAGITTAL PLANE
Each of the muscles that drive the craniomandibular apparatus has a force direction dependent upon:
Which directions:
– ANTERIOR TEMPORALIS FORCE VECTOR:
SUPERIOR and SLIGHTLY ANTERIOR
SLIDE 20: Muscle VECTORS in SAGITTAL PLANE
Each of the muscles that drive the craniomandibular apparatus has a force direction dependent upon:
Which directions:
– MIDDLE TEMPORALIS FORCE VECTOR:
SUPERIOR and SLIGHTLY POSTERIOR
SLIDE 20: Muscle VECTORS in SAGITTAL PLANE
Each of the muscles that drive the craniomandibular apparatus has a force direction dependent upon:
Which directions:
– POSTERIOR TEMPORALIS FORCE VECTOR:
POSTERIOR AND SLIGHTLY SUPERIOR
SLIDE 20: Muscle VECTORS in SAGITTAL PLANE
Each of the muscles that drive the craniomandibular apparatus has a force direction dependent upon:
Which directions:
MASSETER FORCE VECTOR:
SUPERIOR and SLIGHTLY anterior.
SLIDE 20: Muscle VECTORS in SAGITTAL PLANE
Each of the muscles that drive the craniomandibular apparatus has a force direction dependent upon:
Which directions:
ANTERIOR DIGASTRIC MUSCLE FORCE VECTOR:
POSTERIOR
SLIDE 20: Muscle VECTORS in SAGITTAL PLANE
Each of the muscles that drive the craniomandibular apparatus has a force direction dependent upon:
Which directions:
POSTERIOR DIGASTRIC MUSCLE FORCE VECTOR:
SUPERIOR and POSTERIOR
SLIDE 20: Muscle VECTORS in SAGITTAL PLANE
Each of the muscles that drive the craniomandibular apparatus has a force direction dependent upon:
Which directions:
INFERIOR HEAD OF THE LATERAL PTERYGOID MUSCLE FORCE VECTOR:
ANTERIOR
SLIDE 20: Muscle VECTORS in SAGITTAL PLANE
Each of the muscles that drive the craniomandibular apparatus has a force direction dependent upon:
Which directions:
Which force vector is the most important?
INFERIOR HEAD OF THE LATERAL PTERYGOID MUSCLE FORCE VECTOR:
— REMEMBER THAT THIS IS ALL AT SAGITTAL PLANE. At FRONTAL VIEW, IT’S ALL DIFFERENT
**
- Which muscle is the MAIN muscle associated with depressing the mandible
- Which muscle MINIMALLY depresses the mandible?
- INFERIOR LATERAL PTERYGOID: MAIN
- - MYLOHYOID: MINIMALLY.
