Final winter Flashcards by Aidan Tro

Benefits of crown lengthening

Increases ferrule size for resistance and retention

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Five advantages of a partial veneer crown over a complete veneer crown

Less hydraulic pressure when seating
Leaves tooth structure in case future pulp testing is needed
Conserves tooth structure
Easier to access margins
Less margin near the gingiva

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Benefit of a bone graft

Increases support for future restorations

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Benefits of a soft tissue graft

Increases esthetics

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Two requirements of solder

Lower melting temp than parent metal

Good wettability

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What does soldering flux do?

Reduces contaminants from oxidation

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The most esthetic Pontic in the maxilla

Ovate

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Four requirements of a Pontic

Restore function of the tooth it replaces
Cleans ability
Esthetics and comfort
Must not injure tissue

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What is a nonrigid Pontic connector used for?

When abutment teeth have different POI

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Which Pontic design may require tissue modification to look good?

Ovate

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Two parts of a nonrigid connector

Matrix and patrix

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Two factors necessary to the success of a pontic

Biocompatibility and mechanical strength

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What is the role of a post when used to restore a root canal treated tooth?

To support the core, which supports the crown

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3 disadvantages of cementing a post into a RCT tooth that doesn’t need a core or crown

Removal of tooth structure
Complicates future RCT
Increases chances of root breakage

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What kind of post do you need for a tooth with an ovoid or irregular root canal?

Custom

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What is meant by an active post?

It is threaded like a screw

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2 advantages of using a longer post vs a shorter one

Longer = more retention

Less likely that the root will crack

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Two things the ferrule does for your restored tooth

Increases resistance

Increases fracture resistance

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Two potential problems associated with using a parapost twist drill to remove gutty percha.

May dig into dentin and undermine it

May perforate the root

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3 advantages of using the indirect method to make provisionals

Less exposure to heat
Less exposure to potential antigens
Easier to get good margins

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What should be overcontoured in a provisional multi unit FPD?

The connectors

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Which reinforcement for provisional FPD had the highest stiffness?

V shaped wire

Which tooth in the hazleton experiment lost cement seal first?

The premolar

Which material withstood the highest number of load cycles in the hazleton study?

Luxatemp hybrid composite

Four types of pins

Cast, cemented, friction grip, threaded

How deep to set pins?

2-3 mm

How far above the surface should the pins go?

2mm

What tool carries impression material into the canal for a custom post?

Lentulo spiral

3 important properties for a post to have

Stiffness Strength Corrosion resistance

Which post is not recommended for patients with bruxism?

Zirconia- too stiff, can crack the root

Disadvantages of zirconia post system(3)

Hard to remove Hard to etch Very stiff

When to use composite core material

Under CCC

When to use cast alloy for a core

When little tooth structure remains, or the tooth will be under heavy occlusal loads

When to use a ceramic core

When esthetics is an issue

What kind of core should not be used with zirconia posts?

Composite- poor bonding

What two core materials can be heat pressed onto a zirconia post?

Zirconia and ceramic

What is a zirconia post's one weakness?

Never grind grooves into it

Why would you want to use a parapost/para core system?

For esthetic purposes

Indications for a partial veneer crown (2)

The tooth has an intact buccal surface and needs a cast restoration As a retainer for a short bridge

Contraindications for a partial veneer crown (3)

Maximum retention required No metal display desired Restoration already on buccal surface

Occlusal clearance needed on a partial veneer crown

1.5mm

Location of the functional cusp bevel on a mandibular partial veneer crown

1.5mm south of the centric contact

Shoulder width on a partial veneer crown

.7mm

Width of the facial shoulder in a mandibular partial veneer crown

.7mm

What disaster do the grooves on a partial veneer crown prevent ?

The crown slipping off lingually

Exit angle for the proximal flare on a partial veneer crown

110*

What is involved with the treatment planning phase (3)

Establish diagnosis Set objectives Establish treatment sequence

Which ASA classification may require medical consult?

ASA 2

During which phase of treatment planning do you measure edentulous spaces?

Treatment planning stage

Describe the pre-prosthetic phase of treatment planning

Stop active disease Move teeth Rebuild gingival architecture

Which way do the dislodging forces work on a fixed partial denture?

Mesio-distally

Which direction do dislodging forces work on a single restoration?

Bucco-lingually

Where can you use a cantilever bridge?

Lateral maxillary incisor with no function | First premolar where both 2nd premolar and 1st molar are abutments

Minimum ferrule length

2mm