Lecture 7 - Art & History of Articulators & Teeth

Question 0

2 types of suspension elements?

Answer 0

1. noncondylar axis

2. postional

Question 1

Type of condylar elements?

Answer 1

1. mobile

2. adjustable

Question 2

type of semi-adjustable condylar elements?

Answer 2

1. arcon - anatomically correct

2. non-arcon - oppos of arcon

Question 3

What are the factors of Hanau’s quint?

Answer 3

condylar guidance, incisal guidance, plane of occlusion, compensating curve, cuspal inclination

Question 4

Thiedleman’s formula?

Answer 4

(condylar guidance x incisal guidance)/ (plane of occlusion x compensating curve x cuspal inclination)

Question 5

What are the modern articulator classifications?

Answer 5

1. simple hinged
2. fixed condyle
3. semi-adjustable
4. fossa-molded
5. fully adjustable

Question 6

First articulator was made in 1804 by…? What particular element did it utilize?

Answer 6

Gariot’s. (Plane line) First articulator had hinged elements. It used one thumb screw to determine the U/L dimension of the device and to measure the vertical dimension of the patient.

Question 7

What are articulator(s) that use the mobile condylar element?

Answer 7

Bonwill’s articulator, so it did hinge movt AND some translation w/ springs.

Question 8

Bonwill triangle was how many inches per side?

Answer 8

4 inches on each side of equilateral triangle.

Question 9

Bonwill determined what about teeth occlusion?

Answer 9

He determined that the overbite/underbite in proportion (occlusion) determined the length of the cusps. (teeth will erupt until they contact opposing teeth)

Question 10

T/F When you have a balanced occlusion and chew from side to side, posterior teeth will be out of contact.

Answer 10

False, they will still be in contact in a balanced occlusion.

Question 11

What is articulator(s) that use the adjustable condylar element?

Answer 11

Luce’s “OGEE” curvature

Walker’s articulator - had to use facial clinometer (that crazy ass Saw-movie like torture device..)

Question 12

Who decided that the facial clinometer was irrational?

Answer 12

Christensen made a “rational” articulator, which used a protrusive record to change the condylar angle.

Question 13

Who subscribed to the theory that condyles had no effect on suspension of the mandible and instead had a spherical theory?

Answer 13

Monson. Monson’s sphere is still used today to establish occlusal plane if you have no other intraoral reference to make prosthodontics/dentures.

Question 14

Who subscribed to the theory that condyles had no effect on suspension of the mandible and instead had a conical theory?

Answer 14

Hall (Hall’s conical theory). He believed that it was in line from occipital to frontal bone.

Question 15

Who used the positional type of suspension element?

Answer 15

Gysi’s Simplex Articulator
Gysi’s Adjustable Articulator
Stansbery’s Tripod

Question 16

What did Gysi’s arrow point tracing to?

Answer 16

Helped define the border movts of mandible (like Posselt’s diagram)

Question 17

Tell me about Stansbery’s tripod?

Answer 17

Each leg had a universal joint that can be moved around independently. Had to match up to R/L lateral protrusion.

Question 18

What where the early tooth replacement locations/time frames that Monsieur Wicks gave us?

Answer 18

Ancient Egypt
Middle Ages Europe
Colonial America

Question 19

Tell me about Gysi’s Simplex Articulator?

Answer 19

• early arcon articulator
• condyles on the lower member
• condylar guidance set at 30 degrees
• incisal guidance set at 60 degrees

Question 20

Tell me about Gysi’s Shark Tooth Occlusal Pathways?

Answer 20

1. articulator condyles set to 20, 30, 40 degrees
2. metal shark’s teeth mounted against plaster block
3. tooth surfaces cut out by masticatory movts

• still used today
• first made an anatomicporcelain tooth 33 degrees designed to function harmoniously w/ incisal and condylar guidance

Question 21

Tell me about Gysi’s Adjustable Articulator?

Answer 21

• 1st to use side shift adjustment and incisal guide table

- arcon instrument

Question 22

Tell me about semi-adjustable articulators?

Answer 22

early articulators were capable of accepting a facebow transfer, centric & eccentric records
- examples: Hanua Model H & GysiTrubyte

Question 23

What is the most widely used and manufactured articulator?

Answer 23

Hanau’s model

Question 24

What does arcon and non-arcon mean?

Answer 24

Arcon means anatomically correct (condyle attached to lower member and fossa to the upper member of articulator).Non-arcon is the opposite.

Question 25

Are our WhipMix articulators an arcon articulator?

Answer 25

YUUSSSSSSS EET IZ

Question 26

Christensen phenomena?

Answer 26

When you protrude the jaw, you get separation of posterior teeth, and thus get occlusion, you will have to have teeth on a curve (Curve of Spee)

Question 27

What 5 elements need to align in order to have bilateral balance and teeth to remain touching?

Answer 27

1 condylar guidance
2 incisal guidance
3 plane of occlusion
4 compensating curve
5 cuspal guidance

-In Hanau Quint, it shows condylar & incisal guidance on one side of a see-saw like diagram. The rest of the factors on the other side.

Question 28

If you increase incisal guidance,then what must increase?

Answer 28

plane of occlusion, compensating curve, or cuspal inclination

Question 29

T/F You can change condylar guidance, but can’t change incisal guidance.

Answer 29

FALSE! Can change incisal guidance, but not condylar guidance (unless you do invasive surgery).

Question 30

What are example(s) of simple hinge (plane line) articulators?

Answer 30

Kerr’s Verticulator

Gariot’s articulator (remember, it was 1st articulator made)

Question 31

What are example(s) of fixed condyle (arbitrary) articulators?

Answer 31

Gysi’s Simplex Articulator

Question 32

What are example(s) of semi-adjustable articulators?

Answer 32

• Hanau’s H series (used facebow, condyles et by intraoral protrusive records)
• Whipmix articulator

Question 33

What are example(s) of fossa-molded articulators?

Answer 33

Wifp’s TMJ articulator (used intraoral molded records transferred to instrument to have fossa shapes formed into acrylic)

Question 34

What are example(s) of fully adjustable articulators?

Answer 34

Granger’s Gnatholator

• developed to capture mandibular movt in specific manner
• provides any specific side shift
• provides timing from one jaw to another
• uses pantograph