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2 - Fixed Prosthodontics Concepts Flashcards

(69 cards)

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1
Q

What has better resistance form, a taller and narrower prep or a shorter and wider prep

A

Taller and narrower preparation has better resistance form

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2
Q

It is more likely and common for a __ crown to come decemented rather than an __

A

posterior
anterior

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3
Q

A fixed prosthodontics restoration that is fabricated outside the patients mouth and its meant to be cemented

A

Indirect restoration

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4
Q

With an indirect restoration, the tooth is prepared for the restoration and then a

A

final impression is made (To make a master cast to send to the lab)

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5
Q

What are 5 common indirect restorations

A

Inlays
Onlays
Crowns
Bridges
veneers

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6
Q

Any dental prosthesis that is luted, screwed or mechanically attached or otherwise securely retained to natural teeth, tooth roots and or dental implant abutments that furnish the primary support for the dental prosthesis

A

Fixed dental prosthesis (FDP)

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7
Q

Structure that directly receives thrust or pressure; an anchorage

A

Abutment

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8
Q

The part of a fixed dental prosthesis that unites the abutment to the remainder of the restoration

A

Retainer

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9
Q

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

A

Pontic

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10
Q

In FDPs, the portion of a FDP that unites the retainer and pontics

A

connector

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11
Q

The weaker the material for an FDP the larger the

A

connectors

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12
Q

The skeletal portion of prosthesis around which and to which are attached the remaining portions of the prosthesis to produce a finished restoration

A

Framework

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13
Q

The specific direction in which a prosthesis is placed on the abutment teeth

A

Path of placement / path of insertion / path of withdrawal

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14
Q

Path of placement of FDP abutments must be __

A

parallel to each other

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15
Q

A visual survey of the path of placement is done how

A

center of occlusal/incisal surface of prep is viewed with one eye (the other one closed)

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16
Q

Doing a visual survey ensures that the prep is neither

A

undercut or overtapered

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17
Q

Indirect vision for FDPs (3 things)

A

Firm finger rest
Maneuver mirror until one prep is centered
Move mirror without changing angulation until the next abutment is centered

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18
Q

What is a useful tool for evaluating an FDP path of insertion

A

making a diagnostic cast

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19
Q

Path of placement for posterior teeth

A

It is usually perpendicular to the occlusal plane to avoid getting “locked out”

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20
Q

Path of placement for anterior teeth

A

Usually flared to the facial, following the long axis of the tooth

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21
Q

What is the die hardener

A

Very thin layer (3-5 um) of material that is applied to the die to harden it. It reduces the risk of abrading/braking the stone (like the finish line)

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22
Q

The die hardener is applied before the

A

die spacer

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23
Q

What is the Die spacer

A

Thin layer (25-50 um) of material that is applied to the die to create a space for the cement when cementing the crown
(there are different brands with different thicknesses)

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24
Q

Die spacer should be placed on the prep, stopping __ away from the finish line

A

1 mm

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25
Die spacer is applied after the __
die hardener
26
By not applying the die spacer 1 mm within the margin will allow the following 3 things
1. Utilize this area as a stop when cementing the crown, guarantee space for the cement 2. Orient the crown not only on the occluso-apical axis but on the mesio-distal and bucco-lingual axis 3. Nice tight marginal seal, since there was never a spacer intended to be there
27
This is very useful when seating crowns if the crown is not seating appropriately
Occlude
28
What is occlude
an aerosol spray for disclosing high spots and contact points (Dries instantaneously; adheres to dry or moist surfaces)
29
The most gingival point of curvature along the free gingival margin of a tooth
Gingival zenith (gingival trigone)
30
Why is gingival zenith important
You want your restoration to have a gingival zenith that matches the contralateral tooth's so achieve better esthetics
31
Where is the gingival zenith usually ? With the exception of?
Usually lies distal to the center of the tooth, with the exception of the lateral incisor which is in the midline
32
Thin gingival biotype
Thin: Narrower bad of keratinized tissue which may end in a wavy mucogingival junction periodontal probe is possible to be seen through the gingival while probing
33
Thick gingival biotype
Thick: Wide band of keratinized tissue Thick gingiva Short papilla Squarish teeth From the occlusal view, the alveolar housing of the teeth is broad
34
Which gingival biotype has a thinner and thicker buccal plate
Thinner buccal plate = thin biotype Thicker buccal plate = thick biotype
35
The combined width of connective tissue and junctional epithelial attachment formed adjacent to a tooth and superior to the crestal bone
Biologic width
36
What is the preferred biologic width
2.04 mm
37
Finish lines are always found on
dental structure
38
When preparing a tooth for ANY kind of restoration its important to place the finish line on
sound dental structure
39
If you don't place the finish line on sound dental structure the restoration has a
higher risk of failure (basically it would have multiple margins, so theres multiple places where the restoration can fail)
40
When should you consider crown fluting
When a multi-rooted tooth has had bone loss/super-erupted needs to be evaluated for its periodontal prognosis, specifically on its furcation
41
What is crown fluting
When doing a crown, the crown anatomy needs to be modified to allow cleans-ability. A slot needs to be incorporated on the crowns surface coronal to the furcation
42
What type of margin is recommended when doing crown fluting
feather-edge or a light chamfer margin (to conserve as much dental structure as possible)
43
All internal line angles should be
rounded
44
What are 2 reasons we round internal line angles
1. reduce stress on the remaining tooth structure (prep) 2. Less chance of that edge to brake or wear down during the fabrication of the master cast/crown. This might not let the crown seat completely due to an interference
45
Crown gauge / caliper
used to measure the thickness of a crown on a particular area (very useful when adjusting a crown/framework were limited space is available)
46
Absolute minimum thickness of a PFM - metal coping
>/= 0.3mm (0.5mm ideal)
47
Absolute minimum thickness of occlusal surface of a FMC
>/= 1 mm
48
Absolute minimum thickness of PFM - coping and porcelain
>/= 1.5 mm
49
No more than __ of a layer of porcelain should be applied on a FDP
2 mm
50
You can ask the lab to create the interproximal contacts __ to assure good porcelain support
in metal
51
You want to extend the design of the framework so it
supports the porcelain in a better way to prevent fracture
52
__ of the porcelain will increase the risk of fracture
Porosity
53
A band or ring used to encompass the root or crown of a tooth
Ferrule effect
54
Provides a bracing or casing effect to protect the integrity of the root
The ferrule
55
Ferrule height is measured from the __ to the __
build up core crown margin
56
Ideally, a ferrule effect of __ is wanted to minimize the risk of fracture.
1.5-2 mm
57
If the height of a ferrule effect is not met can we put a post in
A post is NOT contraindicated if that height is not met but compromises it prognosis
58
We are looking to create a __ to obtain occlusal stability while mounting casts for crown fabrication
tripod effect
59
Use registration material where
ONLY on the teeth you are restoring (already have the other "legs" to your stool)
60
A fixed dental prosthesis that is luted to tooth structures, primarily enamel, which has been etched to provide mechanical retention for the resin cement.
Resin bonded prosthesis (maryland bridge)
61
What are 5 indications for a resin-bonded prosthesis
1. Where abutment teeth are minimally or unrestored, with sufficient enamel present for adhesion 2. Patients unwilling or unsuitable for surgical treatment including implants, bone augmentation 3. Fixed retention after orthodontic treatment 4. Splinting periodontally compromised teeth to improve comfort 5. Needle-phobic patients
62
What are 5 contraindications for a resin-bonded prosthesis
1. heavily restored abutment teeth with reduced enamel for adhesion 2. Small abutment teeth 3. Mal-aligned abutment teeth 4. Significant differential mobility of abutment teeth where more than one abutment is incorporated in the design, as this frequently leads to de-bond 5. Allergy to base metal alloys (nickel)
63
What is the most common complication with a resin bonded prosthesis
De-bonding (loss or retention)
64
What are 4 other common complications with a resin-bonded prosthesis
Material complications: framework and veneer fractures dental caries recurrent peridontitis poor esthetics
65
The complete intercuspation of the opposing teeth independent of condylar position
Maximal intercuspal position
66
THe occlusion of opposing teeth when the mandible in in centric relation
Centric occlusion (may or may not coincide with MIP)
67
The relationship in which the condyles articulate in the most anterior-superior position
Centric relation
68
Centric relation is independent of
tooth contact
69
CR positon = Not TMJ related =
CO MIP

FP (12 decks)

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