1/10: Intro. Articulators and Facebows

Question 1

What are types of restorative materials for teeth?

Answer 1

Dental amalgam
Composite materials
Gold restorations (gold foil)
Gold castings (inlays, onlays, crowns)
Ceramics (crowns, bridges (fxed partial dentures), veneers

Question 2

What are two important concerns about dental amalgam as restorative material?

Answer 2

Biocompatible - not generally considered problem for patients
wastewater - pollution with mercury

Question 3

What are advantages to dental composite?

Answer 3

Aesthetics
Bonding to the tooth structure
Can be more conservative
Less expensive
Reduced mercury

Question 4

What are disadvantages to dental composite?

Answer 4

Shrinkage
Durability
Chipping
More skill required
Need to keep area dry
Time and expense

Question 5

What does bonding allow for?

Answer 5

The dentist to use dental composites on teeth to change shape, color or contours

Question 6

What is the oldest type of filling material available?

Answer 6

Gold foil or direct gold

Question 7

What type of material can last the lifetime of a patient?

Answer 7

Gold foil or direct gold

Question 8

What kind of material can be placed in one visit in small cavities and will last longer than any other restorative material?

Answer 8

Pure gold

Question 9

What are types of crowns?

Answer 9

Cast gold
Porcelain fused to metal
High strength ceramics

Question 10

How long will PFM crowns last?

Answer 10

95% success rate between 5-10 years in cross-sectional study
97.5% success rate at 7 years
95.5% at 7 years assessed in private practices

Question 11

What are types of tooth replacements?

Answer 11

Complete dentures (with implants)
Partial dentures (with implants)
Fixed bridges and single teeth (with implants)

Question 12

What are some positives of high strength ceramics?

Answer 12

Broad range of indications
Excellent clinical performance
Accepted metal alternative
Less tooth reduction required
Thinner coping thickness
Shaded coping options offer improved esthetics

Question 13

What is a mechanical device that simulates mandibular movements of condyles in their fossae?

Answer 13

Articulators

Question 14

What are the four uses of an articulator?

Answer 14

Diagnosis
Treatment planning
Communicate with patients/patient education
Fabrication of prostheses/restorations

Question 15

Label the components of an articulator

Answer 15

Question 16

What kind of movements do non adjustable or “hinge” articulators allow for?

Answer 16

Only opening and closing movements

Question 17

What are non adjustable or hinge articulators used for?

Answer 17

Single posterior restorations

Question 18

What can a non adjustable or hinge articulators use create?

Answer 18

A change in the closure angle, and by doing so the final restoration will present premature contacts

Question 19

What kind of articulators are used the most?

Answer 19

Semi-adjustable articulators

Question 20

What do semi-adjustable articulators allow for?

Answer 20

Opening and closing
Movements as well as excursive
Lateral and protrusive movements

Question 21

What are the two types of semi-adjustable articulators?

Answer 21

Arcon
Non arcon

Question 22

What are arcon articulators?

Answer 22

Condyles in lower member
Condylar inclination in the upper member

Question 23

What are non arcon articulators?

Answer 23

Condyles on upper member
Condylar inclination on the lower member

Question 24

What type of articulator is our articulator?

Answer 24

Arcon articulator

Question 25

What is the purpose of a face-bow?

Answer 25

Orient the maxillary cast to the rotational axis in three planes

Question 26

What does using a face-bow result in?

Answer 26

Reproducible articulation of subsequent maxillary casts

Question 27

What does the face-bow orient?

Answer 27

The dental cast in the same relationship to the opening axis of the articulator

Question 28

What are the anatomic references of the facebow?

Answer 28

Mandibular condyles
Transverse horizontal axis
One other selected anterior point

Question 29

What do kinematics locate?

Answer 29

The true transverse horizontal axis of rotation

Question 30

What do arbitrary locate?

Answer 30

The axis by using anatomical landmarks

Question 31

What does arbitrary utilize to locate?

Answer 31

Average measurements to approximately locate the axis of rotation

Question 32

What is the transverse horizontal axis or terminal hinge axis?

Answer 32

Imaginary axis which passes through each of the mandibular condyles

Question 33

What is the transverse horizontal axis around?

Answer 33

This axis that pure rotational movement of the mandible occurs

Question 34

Where is the transverse horizontal axis located?

Answer 34

About 8mm under the soft tissues in front of the tragus (on each side of the face)

Question 35

What is the bergstrom point?

Answer 35

A point 10mm anterior to the center of a spherical insert in the external auditory meatus and 7mm below the frankfort horizontal plane

Question 36

Where does the ear-bow index to?

Answer 36

External auditory meatus

Question 37

What does the ear bow register?

Answer 37

The relation of the max arch to these and a horizontal reference plane

Question 38

What does the facebow orient the maxillary cast to?

Answer 38

A reference plane

Question 39

What does the reference plane require?

Answer 39

3 points (2 on each side of the face and one on the anterior face)

Question 40

What should the anteiror reference (aka 3rd point of reference) be?

Answer 40

Repeatable and reproducible

Question 41

What is the orbitale of the 3rd point of reference?

Answer 41

The lowest point on the infra-orbital rim (spring bow)

Question 42

When should you use a face-bow?

Answer 42

• Cusp teeth are present
• Interocclusal records are made at an increased occlusal vertical dimension
• The occlusal vertical dimension is subject to change and alteration in occlusal surfaces are necessary