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Occlusion > Quiz 1 > Flashcards

Quiz 1 Flashcards

1
Q

The temporomandibular joint movement is characterized by position of what?

And it’s best seen in what view of the patient?

A

The condyle in the glendoid fossa

Sagittal View

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2
Q

What are the functions & purposes of the Ligaments supporting the TMJ and mandible?

A
  • Limit mandibular movement
  • Protect the musculature, especially during extreme movement
  • Non-elastic
  • Non-contractile
  • No innervation
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3
Q

How is the articular disc attached in both the posterior and anterior aspects?

A
  • Anterior portion: attached to musculature
  • Posterior portion: attached to retrodiscal tissues
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4
Q

What does the Outer Oblique Portion and the Inner Horizontal Portion of the TMJ ligament limit?

A
  • OOP - limits normal rotational opening movement
  • IHP - limits posterior movement of condyle & disc
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5
Q

What part of the condyle has the greater surface area? And what part will be where most of the articulation between the condyle and the articular disc and the temporal bone occur?

A

Posterior aspect - more surface area

Anterior aspect - more articulation

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6
Q
  1. What is maximum intercuspation also known as?
  2. What is maximum intercuspation commonly referred to as?
  3. What does Maximum intercuspation describe?
  4. How are the teeth in contact in regards to the patient?
  5. Is Maximus intercuspation easily achievable?
A
  1. Centric Occlusion (obsolete term)
  2. Habitual Occlusion or Habitual Centric (because it’s achieved by “habit”)
  3. An occlusal relationship or tooth position
  4. In a position the patient finds most comfortable
  5. Yes - Easily achievable but not always reproducible
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7
Q

Describe a Cenrtic Relation (5 things).

A
  1. A condylar position (does not need teeth)
  2. Establishes the position os the condyle in a superior and anterior location with the disc interposed
  3. Articulation on the thinnest portion of the articular disc
  4. Described as the most stable position of the condyle
  5. A position of the mandible where the musculature displays minimal tonus
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8
Q
  1. What determines occlusal positon?
  2. What happens if centric relation and maximum intercuspation do not coincide?
  3. How many patients have a “slide”?
A
  1. Teeth
  2. The patient will have a “slide”
  3. Most patients (about 1-2mm) from CR to MI
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9
Q
  1. What is Maximum Intercuspation?
  2. Where should all occlusal forces be concentrated?
  3. Describe the maximum intercuspation position.
A
  1. Simultaneous contact of all the teeth and is the “endpoint” of the slide
  2. Down the long axis of posterior teeth
  3. Dynamic in nature and will change throughout a patient’s life
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10
Q

When the mandibular teeth close against the maxillary teeth… (4 Things)

A
  • Ideal way for teeth to contact each other
  • Ideal location for condyle and articular disc
  • Minimal musculature tonus
  • Uniform and simultaneous occlusal contact
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11
Q

What is the right side called during a left lateral mandibular movement?

A

The “Balancing Side” or “Non-working Side”

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12
Q

During an Ideal Occlusion:

  1. How should Centric Relation and Maximum Intercuspation occur?
  2. How do all teeth contact?
  3. All occlusal forces on posterior teeth are directed how?
  4. Posterior tooth contacts are ______ compared to anterior teeth?
  5. All eccentric movements are guided by what?
  6. What should never be seen on posterior teeth?
A
  1. Simultaneously
  2. Simultaneously
  3. Down the long axis of the teeth
  4. Stronger (dominate over)
  5. Anterior teeth
  6. Crossover
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13
Q
  1. What is the emphasis on, of the muscles of mastication?
  2. What does studying the muscles of mastication lead to better understanding of?
  3. How can the actions of muscles be described?
A
  1. Actions
  2. Temporomandibular and Occlusal Dysfunction
  3. Normal vs Paranormal
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14
Q

What are the actions of the Masseter?

A
  • Elevate the mandible (functional)
  • Causes clenching (parafunctional)
  • Aids in protrusive movement
  • Aids in lateral movement (minimally)
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15
Q
  1. What does the relationship of the medial pole of the condyle and the medial pterygoid muscle on one side establish?
  2. How is the normal curve of occlusion possible?
  3. From the fully seated positions of the condyle in the fossa, is it possible for mandibular lateral translation?
A
  1. The mid-most position of the mandible at Centric Relation
  2. The interaction of the medial pole of the condyle with the steep medial wall of the fossa prevents mandibular posterior teeth from moving straight horizontally toward the midline
  3. No - not in ideal patients
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16
Q

What muscles are involved in seating the condyles of the fossa?

What muscle contributes most to the condylar seating?

A
  • Temporalis, masseter, medial pterygoid (no lateral pterygoid)
  • Temporalis contributes most
17
Q

Describe the Superior Head of the Lateral Pterygoid.

A
  • Slow acting muscle fibers
  • Short and controlled movements
  • Maintains a sustainable and consistent position of the articular disc
  • Progessively active during closing movement of the mandible
  • Displays a spasm as a result of some types of occlusal dysfunction
  • Works in concert with the action and inactivity of the inferior head of the lateral pterygoid
  • Deep, can’t really palpate
18
Q

What are the important characteristics of the Digastric Muscle Complex?

A
  • Posterior head assists in producing mandibular retrusion
  • Anterior head is minimally involved in producing mandibular retrusion
  • Both heads will elevate hyoid bone
  • Muscle spasms are seen more commonly in posterior digastric than in anterior
  • Both heads slightly depress mandible, posterior head more so than anterior
19
Q

What are the actions of the Mylohyoid Muscle?

A
  • Slightly depress the mandible
  • Elevates the hyoid, floor of oral cavity and the tongue
  • Important during speaking and swallowing
20
Q

Describe the normal jaw opening movement (early phase).

A
  • Inferior head of the lateral pterygoid contracts (controlled, slow, consistent)
  • Condyle moves anteriorly
  • Articular disc will move with condyle (the condyle will interact with the thinnest part of the disc - midsection)
  • Superior retrodiscal tissues undergo a slight tautness - counter balance to the superior head of the lateral pterygoid
21
Q

Describe the muscle vectors in the Anterior, Middle and Posterior Temporalis, Masseter, Anterior & Posterior Digastric, Inferior Head of the Lateral Pterygoid.

A
  • Anterior Temporalis - Sup & Slightly Ant
  • Middle Temporalis - Sup & Slightly Post
  • Posterior Temporalis - Post & Slightly Sup
  • Masseter - Sup & Slightly Ant
  • Anterior Digastric - Posterior
  • Posterior Digastric - Superior & Posterior
  • Inferior Head of the Lateral Pterygoig - Anterior

Occlusion (4 decks)

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