Fixed Exam 1 and 2 - Fixed Prosth Concepts

Question 1

Better or worse resistance form?

Taller and narrower prep

Answer 1

Better resistance form

Question 1

Better or worse resistance form?

Shorter and wider prep

Answer 1

Worse resistance form

Question 2

Which crown is more like to become decemented: anterior or posterior?

Answer 2

Posterior

Question 3

Structure that directly receives thrust or pressure; an anchorage

Answer 3

Abutment

Question 4

Tooth, portion of a tooth, or portion of a dental implant that serves to support and/or retain a prosthesis

Answer 4

Abutment

Question 5

Part of a FDP that unites the abutments to the remainder of the restoration

Answer 5

FDP retainer

Question 6

Artificial tooth on a FDP that replaces a missing natural tooth, restores its function, and fills the space previously occupied by the clinical crown

Answer 6

Pontic

Question 7

Portion of FDP that unites the retainers and pontic

Answer 7

Connector

Question 8

The weaker the material, the ___________ the connectors

Answer 8

bigger

Question 9

Specific direction in which a prosthesis is placed on the abutment teeth

Answer 9

Path of insertion/placement

Question 10

Path of placement FDP abutments must be ______________ to each other

Answer 10

parallel

Question 11

How do you view the path of placement?

Answer 11

Close one eye and look at center of occlusal surface of prep

Question 12

Ensures prep is neither undercut or overtapered

Answer 12

Visual survey

Question 13

What should you use if direct vision of the prep is not possible when determining the path of placement?

Answer 13

Mirror (indirect vision)

Question 14

When using indirect vision to view the path of placement of a FDP, use a firm ___________ ________, maneuver the ___________ until the first prep is centered, and then move mirror without changing _____________ until the next abutment is centered

Answer 14

finger rest; mirror; angulation

Question 15

What can be a useful tool to evaluate an FDP path of placement?

Answer 15

Diagnostic cast of the preps

Question 16

The path of placement for posterior teeth is _____________ to the occlusal plane to avoid getting “locked out”

Answer 16

perpendicular

Question 17

The path of placement for anterior teeth is usually _____________ to the __________, following the long axis of the tooth. For an FDP, find a mid-point between the tooth’s long axis to prevent _______________ the tooth

Answer 17

flared; facial; over-preparing

Question 18

Very thin layer of material applied to the die to harden it

Answer 18

Die hardener

Question 19

Reduces risk of abrading/braking the stone (like the finish line)

Answer 19

Die hardener

Question 20

How thin is the die hardener?

Answer 20

3-5 um

Question 21

When is the die hardener applied?

Answer 21

Before the die spacer

Question 22

Thin layer of material that is applied to the die to create a space for the cement when cementing the crown

Answer 22

Die spacer

Question 23

This should be placed on the prep, stopping 1 mm away from the finish line

Answer 23

Die spacer

Question 24

When is the die spacer applied?

Answer 24

After the die hardener

Question 25

T/F: There are different brands of die spacers with different thicknesses

Answer 25

True

Question 26

How thin is the die spacer?

Answer 26

25-50 um

Question 27

By stopping the die spacer within 1 mm of the margin, what are you making sure of? (3)

Answer 27

1. Guarantees space for the cement 2. Orients the crown on the occlusal-apical axis, mesio-distal axis, and bucco-lingual axis 3. Tight marginal seal

Question 28

Aerosol spray for disclosing high spots and contact points

Answer 28

Occlude

Question 29

Very useful when seating crowns if the crown is not seating properly

Answer 29

Occlude

Question 30

Dries instantaneously; adheres to dry or moist surfaces

Answer 30

Occlude

Question 31

Most gingival point of curvature along the free gingival margin of a tooth

Answer 31

Gingival zenith/trigone

Question 32

Why should you evaluate the contralateral tooth's gingival zenith?

Answer 32

Want new restoration to match it for better esthetics

Question 33

Where is the gingival zenith?

Answer 33

Distal to the center of the tooth (exception: lateral incisor is in the midline)

Question 34

Which biotype? Narrower band of keratinized tissue, which may end in a wavy mucogingival junction

Answer 34

Thin biotype

Question 35

Which biotype? Periodontal probe is possible to be seen through the gingiva while probing

Answer 35

Thin biotype

Question 36

Which biotype? Wide band of keratinized tissue

Answer 36

Thick biotype

Question 37

Which biotype? Short papilla

Answer 37

Thick biotype

Question 38

Which biotype? Squarish teeth

Answer 38

Thick biotype

Question 39

Which biotype? From occlusal view, the alveolar housing of the teeth is broad

Answer 39

Thick biotype

Question 40

Which biotype? Thinner buccal plate

Answer 40

Thin biotype

Question 41

Which biotype? Thicker buccal plate

Answer 41

Thick biotype

Question 42

Combined width of CT + JE attachment formed adjacent to a tooth and superior to the crestal bone

Answer 42

Biologic width

Question 43

What is the average dimension of biologic width?

Answer 43

2.04 mm

Question 44

What is the new term for biologic width?

Answer 44

Supracrestal attached tissue

Question 45

Finish line should always be on ?

Answer 45

Sound dental structure

Question 46

What happens if the restoration is not on sound dental structure?

Answer 46

Higher risk of failure Multiple margins

Question 47

When a multi-rooted tooth has had bone loss/super-erupted needs to be evaluated for it’s periodontal prognosis, especially on it’s ____________

Answer 47

furcation

Question 48

If a crown is indicated on a perio tooth, the crown anatomy needs to be modified to allow cleansability. A _______ needs to be incorporated on the crown’s surface coronal to the furcation

Answer 48

slot

Question 49

Usually a feather-edge or a light chamfer margin is recommended to conserve as much dental structure as possible

Answer 49

Crown fluting

Question 50

__________ all internal line angles! No sharp edges

Answer 50

Round

Question 51

Rounding internal line angles reduces _________ on the remaining tooth structure

Answer 51

stress

Question 52

Rounding internal line angles ensure less chance of the edge to brake or wear down during the fabrication of the master cast/crown. If there are sharp edges, it might not let the crown _________ completely due to an interference

Answer 52

seat

Question 53

Measures the thickness of a crown on a particular area

Answer 53

Crown gauge/caliper

Question 54

Very useful when adjusting a crown/framework were limited space is available

Answer 54

Crown gauge/caliper

Question 55

What is the absolute minimum thickness for PFM metal coping?

Answer 55

≥ 0.3mm (0.5mm ideal)

Question 56

What is the absolute minimum thickness for occlusal surface of full metal crown?

Answer 56

≥ 1 mm

Question 57

What is the absolute minimum thickness for PFM coping + porcelain?

Answer 57

≥ 1.5 mm

Question 58

No more than ________ of a layer of porcelain should be applied on a FDP

Answer 58

2 mm

Question 59

You can ask the lab to create the interproximal contacts in ________ to assure good porcelain support

Answer 59

metal

Question 60

What should you do if you are worried about unsupported porcelain?

Answer 60

Extend the design of the framework (prevents fracture)

Question 61

______________ on the porcelain will increase the risk of fracture

Answer 61

Porosities

Question 62

Band or ring used to encompass the root of a crown

Answer 62

Ferrule

Question 63

Provides a bracing or casing effect to protect the integrity of the root

Answer 63

Ferrule

Question 64

How is ferrule height measured?

Answer 64

Build-up core to crown margin

Question 65

What is ideal ferrule height to minimize fracture?

Answer 65

1.5 - 2 mm

Question 66

T/F: A post is NOT contraindicated if the ferrule height of 1.5-2mm is not met, but it compromises its prognosis

Answer 66

True

Question 67

We’re looking to create a ________ effect to obtain occlusal stability while mounting casts for crown fabrication

Answer 67

tripod

Question 68

T/F: Use registration material only on the teeth you’re restoring, you already have contact on the other “two legs of the stool”

Answer 68

True

Question 69

FDP luted to tooth structures, primarily enamel, which has been etched to provide mechanical retention for the resin cement

Answer 69

Resin-bonded prosthesis (Maryland bridge)

Question 70

What is the MOST common complication for a resin-bonded prosthesis (Maryland bridge)?

Answer 70

Debonding

Question 71

What are 4 other common complications for a resin-bonded prosthesis (Maryland bridge)?

Answer 71

Material complications Caries Recurrent perio Poor esthetics

Question 72

Complete intercuspation of opposing teeth independent of condylar position

Answer 72

MIP

Question 73

Referred to as the best fit of the teeth regardless of condylar position

Answer 73

MIP

Question 74

Occlusion of opposing teeth when the mandible is in centric relation

Answer 74

Centric occlusion

Question 75

May or may not coincide with MIP

Answer 75

Centric occlusion

Question 76

Maxillomandibular relationship in which the condyles articulate w/ the thinnest avascular portion of their respective disks with the complex in the anterior-superior position against the shapes of the articular eminencies

Answer 76

Centric relation

Question 77

Independent of tooth contact

Answer 77

Centric relation

Question 78

Clinically detectable when the mandible is directed superior and anteriorly

Answer 78

Centric relation

Question 79

Restricted to a purely rotary movement about the transverse horizontal axis

Answer 79

Centric relation

Question 80

Not TMJ related

Answer 80

MIP