Fixed Exam 1 - Pontics Flashcards by A G

Q

Biology, mechanics, or esthetics?

Cleansable tissue surface

A

Biology

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Q

Biology, mechanics, or esthetics?

Access to abutment teeth

A

Biology

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Q

Biology, mechanics, or esthetics?

No excessive pressure on ridge

A

Biology

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Q

Biology, mechanics, or esthetics?

Rigid (resist deformation)

A

Mechanics

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Q

Biology, mechanics, or esthetics?

Strong connectors to prevent fracture

A

Mechanics

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Q

Biology, mechanics, or esthetics?

Anatomy of tooth being replaced

A

Esthetics

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Q

Biology, mechanics, or esthetics?

Appears to “grow” out of edentulous site

A

Esthetics

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Q

Biology, mechanics, or esthetics?

Sufficient clearance for porcelain

A

Esthetics

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Q

Which Siebert classification of edentulous ridges?

Minimal width and height deficiency

A

Class N

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Q

Which Siebert classification of edentulous ridges?

9% of edentulous sites

A

Class N

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Q

Which Siebert classification of edentulous ridges?

Faciolingual loss of tissue width
Normal ridge height

A

Class I

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Q

Which Siebert classification of edentulous ridges?

32% of edentulous sites

A

Class I

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Q

Which Siebert classification of edentulous ridges?

Normal ridge width
Loss of ridge height

A

Class II

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Q

Which Siebert classification of edentulous ridges?

3% of edentulous ridges

A

Class II

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Q

Which Siebert classification of edentulous ridges?

Faciolingual loss of tissue width
Loss of ridge height

A

Class III

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Q

Which Siebert classification of edentulous ridges?

56% of edentulous sites

A

Class III

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Q

What type of pontic?

Zero tissue contact

A

Hygienic

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Q

What type of pontic?

All metal/zirconia has 2mm clearance from gingiva

A

Hygienic

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Q

What type of pontic?

Highly unaesthetic, used only for posterior

A

Hygienic

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Q

What type of pontic?

Concave gingival surface that overlaps ridge buccally and lingually

A

Ridge lap (saddle)

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Q

What type of pontic?

Not recommended since it is not hygienic

A

Ridge lap (saddle)

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Q

What type of pontic?

Combines best features of Hygienic and Ridge lap (saddle) pontics for great cleansability and esthetics

A

Modified ridge lap

Q

What type of pontic?

Slight tissue contact on facial aspect of ridge, giving a natural appearance of a tooth emerging from the gingiva

A

Modified ridge lap

Q

What type of pontic?

All surfaces should be convex to allow hygiene

A

Modified ridge lap

What type of pontic? Most common

Modified ridge lap

What type of pontic? Egg-shaped, bullet-shaped, heart-shaped

Conical

What type of pontic? Not esthetic or hygienic, indicated for posterior extraction sites w/ narrow alveolar ridge

Conical

What type of pontic? Most esthetic

Ovate

What type of pontic? Depression/hollow in residual ridge, makes it look like it's emerging from the gingiva

Ovate

What type of pontic? Used in highly esthetic cases (ex: high smile line)

Ovate

What should be used to avoid ridge collapse?

Socket preservation

What can be done to an old ext site to create more ridge volume?

Soft tissue graft

What type of pontic? Retained and supported only on one end by one or more abutments

Cantilever

What type of pontic? Very high risk of failure, should never be part of the ideal tx plan due to unfavorable biomechanics

Cantilever

When is the only appropriate time to consider using a cantilever pontic?

Replacing a maxillary lateral incisor

When replacing a maxillary lateral incisor with a cantilever pontic, the pontic should have very ________ occlusal contact in CO, MIP, and every eccentric movement

light

What are the 2 potential complications of a cantilever pontic?

Torque abutment teeth Retainer decementation

A pontic should have no contact or slight contact with tissue. Avoid too much _________ (soft tissue blanching)

pressure

What is the main cause of tissue irritation from a pontic?

Plaque btwn pontic and ridge

What 3 things can be used to clean under a pontic?

Superfloss Proxy brush Floss threader

Since FDPs are exposed to increased amounts of load due to the fact that are long restorations, they should be reinforced with a ________ framework

strong

Porcelain is too brittle, it will break under __________

flexure

Which pontic material? Most common, 99% of pontics are made of this

Metal/ceramic

Which pontic material? High abrasion resistance (needs to be polished) Stable and strong

Metal/ceramic

Which pontic material? Not common

Resin veneered

Which pontic material? Low abrasion resistance Dimensional change from water absorption Mechanical retention

Resin veneered

Which pontic material? Very weak Substructure matrix of glass or polymer fiber provides structural strength

Fiber-reinforced composite resin

Reducing the buccolingual width of the pontic by as much as ______% has been suggested to reduce the occlusal load on the retainers and to follow a narrow residual ridge

30%

What is the greatest challenge to replicate after extraction?

Gingival changes

What are the options to replicate gingival changes after extraction?

Bone graft Soft tissue graft Pink porcelain

After extraction, the buccal plate is at high risk of __________. A bone graft is recommended to conserve as much bone as possible

resorption

How thick is the buccal plate?

0.5-1mm

The correct _____________ height/length is critical to esthetic pontic design

inciso-gingival

What are the 2 ways to achieve a correct mesiodistal width for the pontic?

Ortho Visual perception (match location of line angles and adjust interproximal areas)