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Questions and Answers
What type of movement occurs at the condylar head of the mandible?
What type of movement occurs at the condylar head of the mandible?
- Translational movement
- Sliding movement
- Rotational movement (correct)
- Pivotal movement
In how many axes can rotational movement occur at the condylar head of the mandible?
In how many axes can rotational movement occur at the condylar head of the mandible?
- One axis
- Three axes
- Two axes
- Several axes (correct)
Where does the condylar head of the mandible rotate?
Where does the condylar head of the mandible rotate?
- On the under surface of the disc (correct)
- In the mandible's socket
- On the upper surface of the disc
- Around the temporal bone
Which of the following movements is least associated with the condylar head of the mandible?
Which of the following movements is least associated with the condylar head of the mandible?
Which characteristic is true of the rotational movement of the condylar head of the mandible?
Which characteristic is true of the rotational movement of the condylar head of the mandible?
What is the purpose of a pantographic tracing?
What is the purpose of a pantographic tracing?
Which position describes the relationship of the mandible being slightly retruded?
Which position describes the relationship of the mandible being slightly retruded?
What does a pantograph specifically utilize for making tracings?
What does a pantograph specifically utilize for making tracings?
Which movement is NOT typically recorded by a pantographic tracing?
Which movement is NOT typically recorded by a pantographic tracing?
What is the role of ligaments in the context of the temporomandibular joint?
What is the role of ligaments in the context of the temporomandibular joint?
Which statements correctly describe the temporomandibular joint?
Which statements correctly describe the temporomandibular joint?
Which position indicates the mandible positioned away from the maximum intercuspation?
Which position indicates the mandible positioned away from the maximum intercuspation?
What factors influence mandibular movements?
What factors influence mandibular movements?
Which statement about opposing tooth contacts is accurate?
Which statement about opposing tooth contacts is accurate?
What is a critical aspect of musculature in mandibular movements?
What is a critical aspect of musculature in mandibular movements?
How does Overjet (H) relate to the Incisal angle?
How does Overjet (H) relate to the Incisal angle?
What is the primary purpose of checking for 3mm clearance in a protrusive excursion?
What is the primary purpose of checking for 3mm clearance in a protrusive excursion?
What is the relationship between Overbite (V) and the Incisal angle?
What is the relationship between Overbite (V) and the Incisal angle?
If the Incisal angle increases, what would likely happen to the Overbite (V)?
If the Incisal angle increases, what would likely happen to the Overbite (V)?
How does the protrusive relationship influence other dental considerations?
How does the protrusive relationship influence other dental considerations?
Why is the angle of the horizontal condylar path significant in dental practice?
Why is the angle of the horizontal condylar path significant in dental practice?
If Overjet (H) is observed to increase, what effect will it have on the Incisal angle?
If Overjet (H) is observed to increase, what effect will it have on the Incisal angle?
What does the term 'occlusion rims' refer to in dental practice?
What does the term 'occlusion rims' refer to in dental practice?
Which statement accurately describes the relationship between Overbite (V) and Overjet (H) concerning the Incisal angle?
Which statement accurately describes the relationship between Overbite (V) and Overjet (H) concerning the Incisal angle?
In the context of dental occlusion, what does a protrusive excursion refer to?
In the context of dental occlusion, what does a protrusive excursion refer to?
What is the primary axis of rotation for the condyle during laterotrusion?
What is the primary axis of rotation for the condyle during laterotrusion?
Which term describes the lateral bodily shift that occurs at the end of condylar movement?
Which term describes the lateral bodily shift that occurs at the end of condylar movement?
In the context of working condyle movement, which statement best describes the role of Bennett's movement?
In the context of working condyle movement, which statement best describes the role of Bennett's movement?
What occurs during working condyle movement aside from rotation around the vertical axis?
What occurs during working condyle movement aside from rotation around the vertical axis?
Which movement is associated with the balancing condyle during lateral excursions?
Which movement is associated with the balancing condyle during lateral excursions?
What describes the direction of movement for the balancing condyle during mediotrusive movement?
What describes the direction of movement for the balancing condyle during mediotrusive movement?
Which term best describes the movement of the working condyle?
Which term best describes the movement of the working condyle?
Which aspect of the Bennett movement is primarily focused on during lateral excursions?
Which aspect of the Bennett movement is primarily focused on during lateral excursions?
How does the Christensen Phenomenon relate to the movements of the mandible?
How does the Christensen Phenomenon relate to the movements of the mandible?
What would best define the envelope of motion in relation to mandibular movements?
What would best define the envelope of motion in relation to mandibular movements?
Which axis allows for the descent of the balancing condyle?
Which axis allows for the descent of the balancing condyle?
What type of movement is associated with the working condyle during lateral excursions?
What type of movement is associated with the working condyle during lateral excursions?
In the context of Bennett movement, which axis primarily governs the horizontal rotation of the condylar head?
In the context of Bennett movement, which axis primarily governs the horizontal rotation of the condylar head?
Which movement is best associated with the concept of the envelope of motion of the mandible?
Which movement is best associated with the concept of the envelope of motion of the mandible?
What primarily characterizes the Christensen Phenomenon in dental occlusion?
What primarily characterizes the Christensen Phenomenon in dental occlusion?
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Study Notes
Temporomandibular Joint Anatomy
- The temporomandibular joint connects the mandible (lower jaw) to the cranium (skull).
- The condylar head of the mandible rotates on the underside of the disc within the joint.
- This rotation can occur on multiple axes.
Occlusion Rims and Protrusive Excursion
- The occlusion rims establish the proper bite and should have a 3mm clearance during protrusive excursion (moving the jaw forward).
- The protrusive relationship determines the angle of the horizontal condylar path.
Incisal Angle and Overjet/Overbite
- Overjet (horizontal distance between upper and lower incisors) is inversely proportional to the incisal angle.
- Overbite (vertical overlap of upper incisors over lower incisors) is directly proportional to the incisal angle.
Mandibular Movements (Positions)
- Retrudedcentric Position: This is the fully retracted position of the mandible.
- Right Lateral Position: This is the position when the mandible is shifted to the right.
- Left Lateral Position: This is the position when the mandible is shifted to the left.
- Protrusive Position: This is the position when the mandible is moved forward.
Pantographic Tracings
- Pantographic tracings record lateral and protrusive mandibular movements.
- A pantograph (a fully adjustable articulator) is used to create these tracings.
Working Condyle Movement (Laterotrusion)
- The working condyle rotates around a vertical axis during laterotrusion.
- At the end of laterotrusion, a lateral bodily shift occurs, known as Body Side Shift or Bennett's Movement.
Balancing Condyle Movement (Mediotrusive)
- The balancing condyle moves forward, downward, and inward (medially) during mediotrusive movement.
- The balancing condyle movement involves three axes:
- Horizontal-sagittal (transverse or retruded condyle axis)
- Horizontal-coronal axis (sagittal axis)
- Vertical axis with horizontal rotation
- The movement of the balancing condyle facilitates the descent of the balancing condyle.
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