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Reference: Mandibular Movement Lecture Slides.

1. T or F: The mandible is capable of many different types of subtle movements.

ANSWER = True

2. How many basic mandibular movements are there?

a. 2

b. 4

c. 5

d. cannot be determined

e. none of the above

ANSWER = E (there are 3 basic mandibular movements)

3. The “basic” movements of the mandible are:

a. Hinge, chewing, and yawning

b. Translatory movements relative to centric relation

c. Lateral, Dimension, excursion

d. Hinge, lateral, and translatory movements

e. none of the above

ANSWER = D

4. A mandibular movement which is “either opening or closing motions of the mandible

around a horizontal axis that is common to both condyles” would be best classified as a

__________ movement.

a. hinge

b. translatory excursion

c. centric relation

d. lateral

ANSWER = A

5. “Protrusive or Retrusive” movements can also be called _____________ movements;

a. translatory or vertical

b. translatory or shifting

c. translatory or sliding

d. sliding crossbite excursions

e. none of the above.

ANSWER = C

6. Which of the following statements indicate a mandibular “Translatory” movement is

taking place;

a. both condyles leave their fossae and move forward along the articular eminances

b. an opening or closing motion around a horizontal axis common to both condyles

c. both condyles leave the eminences and move back into their respective fossae

d. both “a” and “b”

e. both “a” and “c”

ANSWER = E

7. “Posselt’s Envelope” was is named after:

a. Dr. Elf Posselt

b. Dr. Ulf Posselt

c. Professor Posselt D’enveloppe

d. Dr. Peter K. Thomas

ANSWER = B

8. T or F: The full envelope of Hinge and translatory movements as viewed in the

midsaggital reference plane appears as a special “envelope-like” figure known as “Posselt’s

Envelope”:

ANSWER = TRUE

9. Circle the correct words to make the following statement true;

Posselt’s envelope represents the mandible’s range of (vertical / horizontal) and also

(anteroposterior / lateral) movement.

ANSWER = vertical; anteroposterior

10. Label the following image as being either a “hinge”, “translatory” jaw movements.

Manbibular __________ movement.

ANSWER = hinge

11. T or F: Physiologic rest is a position of vertical dimension which can be recorded with

Posselt’s envelope.

ANSWER = TRUE

12. List at least 3 predictable positions of the mandible:

1._______________

2._______________

3._______________

ANSWER = (centric relation; Centric Occlusion or MIP; Edge to Edge incisor

contact; Negative Horizontal and Vertical Overlaps at incisors; Maximum

Mandibular Protrusion)

13. In which of the following mandibular positions are the teeth in contact?

a. Centric Relation and Centric Occlusion

b. Edge to Edge Incisor Contact

c. Maximum Mandibular Protrusion

d. Negative, Horizontal and vertical overlaps at incisors

e. All of the above

f. a and b only

ANSWER = E

14. Label the following diagram of Posselt’s envelope with the correct jaw position.

1. ___________________ 2.____________________ 3.______________________

4.____________________ 5.____________________

a.____________________ b.____________________ c.______________________

ANSWER =

1. Centric Relation 2. Centric Occlusion or MIP 3. Edge to edge incisor contact

4. Neg. horizontal and vertical overlap. 5. Maximum mandibular protrusion.

a. Physiologic rest position b. Maximum opening of mandible (yawn)

c. border between condylar pure hinge and translatory movement.

**Using the diagram in question 14, answer questions 15 through 19:**

15. Which path demonstrates the most RETRUDED path the mandible is capable of taking

a. From 1 to C

b. “Between C and B”

c. Path 5b

d. Path 1cb

e. Path 2ab

ANSWER = D

16. Path 2ab represents the path of:

a. Maximum Vertical Dimension

b. Pure Hinge movement

c. Path of habitual opening/closing

d. Physiologic rest to VDO

ANSWER = C

17. Locate the point at which the mandible continues to open, but is also TRANSLATED

FORWARD (condyles move out of fossae and onto eminences.)

a. Between c and b

b. Path 5b

c. From 1 to C

d. Path 2ab

e. none of the above

ANSWER = A

18. T or F: “From 1 to C”, the jaw is making a “pure hinge” movement.

ANSWER = TRUE

19. T or F: “Path 5b” is the most Retruded position the mandible is capable of making.

ANSWER = FALSE (Path 5b represents the most PROTRUDED path)

20. A jaw which is moving in a “left or right” motion would be called what type of

movement:

a. lateral pure hinge

b. lateral protrusion

c. lateral

d. horizontally protrusive

e. none of the above

ANSWER = C

21. Circle one answer: The side to which the mandible is moving is called the (working side /

balancing side).

ANSWER = working side

22. T or F: The side that is opposite the working side is called the balancing side.

ANSWER = TRUE

23. The condyle on the working side is called the working condyle, which is also known as

the:

a. orbiting condyle

b. balancing condyle

c. rotating condyle

d. translatory condyle

ANSWER = C

24. T or F: the Balancing condyle is also called the translatory condyle:

ANSWER = FALSE (The balancing condyle is also called the Orbitting condyle)

25. Label the following image as either “pure hinge”, “translatory movement”, or “lateral”.

ANSWER = Translatory movement”