# Lecture 6/7/8 Flashcards

1
Q

A

Step 1: Locate and place cusp cones
Step 2: Place cusp ridges and marginal ridges
Steps 3,4: Develop buccal and lingual cusp ridges and surfaces
Step 5: Place triangular ridges
Steps 6,7: Refine occlusion, finish and polish

2
Q

Kinematic Hinge Axis

A

True axis = kinematic hinge axis. Not easy to find without

pantograph.

3
Q

Arbitrary axis

A

This is arbitrary axis = close enough to kinematic without all of the time and money.

13 mm anterior to tragus on tragus-canthus line

4
Q

Be within

A

6 mm radius from true axis. If you do this,

error is almost negligible.

5
Q

Accuracy jumped up over time as this was modified

A

the bump at the condyle portion helped tremendously) - earbows with modifications.

6
Q

Working condyle

moves anywhere in

A

bennett’s angle.

7
Q

Non-working condyle moves in

A

3 directions - this is the reason for

the medial articulator wall.

8
Q

Angle between protrussive and W =

A

Bennett’s angle. On horizontal plane.

N = nonworking direction.

9
Q

The Frankfort Horizontal Plane

A

Forion, orbital (lowest part of orbital rim). FH plane.

10
Q

Occlusal plane is not parallel to

A

FH plane.

11
Q

Articulator mounting

A

First melt wax on. In the front,

those prongs help with this.

12
Q

Hanau’s Formula for the “lateral” angle (Bennett’s Angle)

A

L = H/8 + 12

Where, L= Lateral angle and H= Horizontal angle

13
Q

Significance of Ear Bow Transfer

A
• Relates maxillary cast to the Terminal Hinge Axis (manibular condyles)
• Orients the maxillary cast correctly in space using a third point of reference (occlusal plane)

-Is aligned parallel to the interpupillary line
(reference)

• Permits mounting of the maxillary cast on a semi-adjustable articulator
• The mandibular cast is mounted using a centric relation (CR) record
14
Q

Centric Relation (CR)

A

The maxillomandibular relationship in which the condyles articulate with the thinnest avascular portion of their respective disks with the complex in the anterior-superior position against the shapes of the articular eminencies. This position is independent of tooth contact.

15
Q

CR Each point on curve is an

equal amount of

A

opening.
Any point is CR (any level
of opening, you are in CR), including last point/phalange (still on arc of rotation).

16
Q

90% have .

A

COMI slide

17
Q

Initial point of contact =

A

CO centric occlusion.
CR is still CO, but CO is a descriptor for a specific CR. MI is not CR.
COMI slide or CRMI slide describe this.

18
Q

Methods of Recording CR

A

Bilateral manipulation
Chin point guidance
Anterior deprogrammer

19
Q

Bilateral manipulation

A

Using two hands to move the jaw.

20
Q

Anterior deprogrammer

A

A bit of acrylic When patient bites down, they bite on acrylic, and eventually deprogram themselves. This removes any abnormal biting so that a patient can move as they naturally do.

**Upward push, not backward.

21
Q

Centric Relation (CR) Record

A

Along the arc of rotation of the mandible No teeth touching
Thin
Soft
Fast setting Dimensionally stable Easily verifiable

22
Q

Casts mounting in CR 3Rs

A

Repeatable, reliable, reproduceable - 3Rs for this.

You will never see this with hand examination.

23
Q

Influence of articular guidance

A

The more you go to the front, you have more incisal guidance.

24
Q

Bow - mark 3rd point of reference

A

Marks 43 mm from occlusal plane. Same distance as orbit distance.