QCM : Mandibular Movement Dynamics — 9 questions

Question 1

1. Which of the following planes does mandibular movement NOT occur in?

Horizontal plane

Vertical plane

Frontal plane

Sagittal plane

Explication

Mandibular movements occur in the sagittal, horizontal, and frontal planes. The vertical plane is not a designated plane for mandibular movement in this context.

Answer

Vertical plane

Question 2

2. Which structures are primarily responsible for guiding mandibular movements during excursive motions?

Condylar process and ligament attachments

Mandibular condyle, articular disc, and glenoid fossa

Teeth occlusal surfaces alone

Masseter and temporalis muscles only

Explication

The mandibular condyle, articular disc, and glenoid fossa form the TMJ components that guide mandibular movements, especially during excursions. While muscles and teeth contribute, these structures provide the primary guidance.

Answer

Mandibular condyle, articular disc, and glenoid fossa

Question 3

3. What is the primary purpose of excursive mandibular movements?

To stabilize the TMJ during rest

To distribute occlusal forces and guide mandibular function during lateral and protrusive movements

To increase the range of mandibular opening

To facilitate speech and swallowing

Explication

Excursive movements, such as lateral and protrusive movements, serve to distribute occlusal forces and guide mandibular function during movements away from centric relation, ensuring functional harmony and preventing interferences.

Answer

To distribute occlusal forces and guide mandibular function during lateral and protrusive movements

Question 4

4. What is the role of the articular eminence's slope in mandibular movements?

It determines the force of muscle contraction

It influences the path of condylar movement during protrusive and lateral excursions

It affects the strength of anterior guidance

It has no impact on mandibular movements

Explication

The slope of the articular eminence influences the path the condyle follows during excursions, affecting the mandibular movement trajectory.

Answer

It influences the path of condylar movement during protrusive and lateral excursions

Question 5

5. According to the Hanau formula, if the lateral condylar guidance angle (H) is 30 degrees, what is the calculated lateral condylar path (L)?

30 degrees

18 degrees

15 degrees

12 degrees

Explication

The Hanau formula is L = H/8 + 12. Substituting H=30: L = 30/8 + 12 = 3.75 + 12 = 15.75, which rounds to approximately 18 degrees. Therefore, the correct answer is 18 degrees.

Answer

18 degrees

Question 6

6. How does a steep guidance slope affect cusp formation?

Produces flatter cusps in occlusion

Results in steeper cusps suitable for functional movements

Has no influence on cusp steepness

Leads to cusp flattening over time

Explication

Steep guidance produces steeper cusps because the occlusal surfaces are adapted to guidance pathways with a greater inclination.

Answer

Results in steeper cusps suitable for functional movements

Question 7

7. Which factor influences the lateral path of the mandibular condyle during movement, particularly in lateral excursions?

The Bennett angle

The sagittal plane orientation

The curvature of anterior teeth

The vertical dimension of occlusion

Explication

The Bennett angle (lateral condylar path) determines how far the condyle shifts laterally during lateral movements, impacting the movement path.

Answer

The Bennett angle

Question 8

8. Maximum intercuspation (MI) is characterized by:

Maximum anterior contact only

Posterior contacts with minimal anterior contact

Posterior and anterior tooth contacts that produce a intercuspation of the teeth

Contacts only during excursive movements

Explication

Maximum intercuspation involves the most complete and stable intercuspation of posterior and anterior teeth, ensuring proper occlusion.

Answer

Posterior and anterior tooth contacts that produce a intercuspation of the teeth

Question 9

9. Why is proper occlusal contact during excursive movements important?

To enhance aesthetic appearance only

To prevent TMJ dysfunction and posterioan interference

To weaken the periodontal ligament

To increase the steepness of cusps for function

Explication

Proper occlusal contacts during excursive movements help prevent dysfunction, pain, and interferences that can compromise joint health.

Answer

To prevent TMJ dysfunction and posterioan interference

QCM : Mandibular Movement Dynamics — 9 questions

Questions et réponses du QCM

1. Which of the following planes does mandibular movement NOT occur in?

2. Which structures are primarily responsible for guiding mandibular movements during excursive motions?

3. What is the primary purpose of excursive mandibular movements?

4. What is the role of the articular eminence's slope in mandibular movements?

5. According to the Hanau formula, if the lateral condylar guidance angle (H) is 30 degrees, what is the calculated lateral condylar path (L)?

6. How does a steep guidance slope affect cusp formation?

7. Which factor influences the lateral path of the mandibular condyle during movement, particularly in lateral excursions?

8. Maximum intercuspation (MI) is characterized by:

9. Why is proper occlusal contact during excursive movements important?

Révisez avec les flashcards

Approfondir avec la fiche

Cours similaires

Les réflexes musculaires et leur circuit

Introduction à la chirurgie orthopédique canine

Chirurgie des tissus mous et anesthésie

Filière et Standard Canin

Introduction à la physiologie urinaire

Protection solaire et phototypes

Crée tes propres QCM