Fixed Exam 1 - Pontics Flashcards
Biology, mechanics, or esthetics?
Cleansable tissue surface
Biology
Biology, mechanics, or esthetics?
Access to abutment teeth
Biology
Biology, mechanics, or esthetics?
No excessive pressure on ridge
Biology
Biology, mechanics, or esthetics?
Rigid (resist deformation)
Mechanics
Biology, mechanics, or esthetics?
Strong connectors to prevent fracture
Mechanics
Biology, mechanics, or esthetics?
Anatomy of tooth being replaced
Esthetics
Biology, mechanics, or esthetics?
Appears to “grow” out of edentulous site
Esthetics
Biology, mechanics, or esthetics?
Sufficient clearance for porcelain
Esthetics
Which Siebert classification of edentulous ridges?
Minimal width and height deficiency
Class N
Which Siebert classification of edentulous ridges?
9% of edentulous sites
Class N
Which Siebert classification of edentulous ridges?
Faciolingual loss of tissue width
Normal ridge height
Class I
Which Siebert classification of edentulous ridges?
32% of edentulous sites
Class I
Which Siebert classification of edentulous ridges?
Normal ridge width
Loss of ridge height
Class II
Which Siebert classification of edentulous ridges?
3% of edentulous ridges
Class II
Which Siebert classification of edentulous ridges?
Faciolingual loss of tissue width
Loss of ridge height
Class III
Which Siebert classification of edentulous ridges?
56% of edentulous sites
Class III
What type of pontic?
Zero tissue contact
Hygienic
What type of pontic?
All metal/zirconia has 2mm clearance from gingiva
Hygienic
What type of pontic?
Highly unaesthetic, used only for posterior
Hygienic
What type of pontic?
Concave gingival surface that overlaps ridge buccally and lingually
Ridge lap (saddle)
What type of pontic?
Not recommended since it is not hygienic
Ridge lap (saddle)
What type of pontic?
Combines best features of Hygienic and Ridge lap (saddle) pontics for great cleansability and esthetics
Modified ridge lap
What type of pontic?
Slight tissue contact on facial aspect of ridge, giving a natural appearance of a tooth emerging from the gingiva
Modified ridge lap
What type of pontic?
All surfaces should be convex to allow hygiene
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)
