Occlusion I - Mandibular Movement Study Terms & Definitions

What are the components of centric relation?

- independent of tooth contact

- condyle is in the most superior and anterior position

- disc is in the thinnest/avascular portion

True/False: centric relation is defined as the condyle being in the most inferior and posterior position

False

What are the two types of movement that the TMJ can do?

rotation and translation

True rotation of the TMJ only occurs in the first ____ mm

A) 15-20

B) 20-25

C) 25-30

D) 30-25

B) 20-25

True/False: pure rotation about the frontal axis occurs naturally

False

The movement described by the horizontal axis is

A) opening and closing

B) gliding

C) translation

D) rotatin

A) opening and closing

What are the 3 axes considered in the TMJ?

horizontal, frontal (vertical), and sagittal

What are border movements?

reproducible describable limits of movement

What are limiter(s) of border movements?

A) ligaments

B) TMJ morphology

C) occlusal morphology

D) tooth alignment

E) all of the above

F) none of the above

E) all of the above

In the sagittal plane, stage 1 posterior border is

A) rotation about terminal hinge axis

B) limited by temporomandibular ligaments

C) limited by stylomandibular ligaments

D) determined by tooth contacts

A) rotation about terminal hinge axis

In the sagittal plane, stage 2 posterior border is

A) rotation about terminal hinge axis

B) limited by temporomandibular ligaments

C) limited by stylomandibular ligaments

D) determined by tooth contacts

B) limited by temporomandibular ligaments

Capsular ligament limit stage 2, posterior border movement to

A) 20-25 mm

B) 30-40 mm

C) 30-60 mm

D) 60-80 mm

C) 30-60 mm

The anterior border in the sagittal plane is

A) rotation about terminal hinge axis

B) limited by temporomandibular ligaments

C) limited by stylomandibular ligaments

D) determined by tooth contacts

C) limited by stylomandibular ligaments

Superior border in the sagittal plane is

A) rotation about terminal hinge axis

B) limited by temporomandibular ligaments

C) limited by stylomandibular ligaments

D) determined by tooth contacts

D) determined by tooth contacts

The CR to MI slide is on average

A) 1.00 mm

B) 1.25 mm

C) 1.50 mm

D) 1.75 mm

B) 1.25 mm

Postural position is when the teeth are apart by

A) 1-2 mm

B) 2-4 mm

C) 4-6 mm

D) 6-8 mm

B) 2-4 mm

The chewing stroke is shaped like a

A) triangle

B) elliptical arch

C) square

D) circle

B) elliptical arch

In the alert feeding position, the mandible is

A) shifted anteriorly

B) shifted posteriorly

C) shifted laterally

A) shifted anteriorly

In the head extended position, the mandible is

A) shifted anteriorly

B) shifted posteriorly

C) shifted laterally

B) shifted posteriorly

In the envelope of motion in the horizontal plane is shaped like a

A) circle

B) oval

C) rhombus

D) triangle

C) rhombus

True/False: the chewing pattern is determined by occlusion

True

In the frontal plane, the envelope of motion is shaped like a

A) star

B) shield

C) rhombus

D) triangle

B) shield

True/False: in the horizontal plane, the chewing pattern increases in size as it moves closer to ICP

False