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FP > Pontics > Flashcards

Pontics Flashcards

1
Q

Pontic Design Biology (3)

A
  • Cleansable tissue surface
  • Access to abutment teeth
  • No excessive pressure on ridge
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2
Q

Pontic Design Mechanics (2)

A
  • Rigid (resist deformation)
  • Strong connectors (prevent fracture)
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3
Q

Pontic Design Esthetics (3)

A
  • Anatomy of tooth being replaced
  • Appears to “grow” out of edentulous site
  • Sufficient clearance for porcelain
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4
Q

Siebert Classification of edentulous ridges:
Class N

A

Minimal width and height deficiency
9% of edentulous sites

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5
Q

Siebert Classification of edentulous ridges:
Class I

A

Facio-lingual loss of tissue width
Normal ridge height
32% of edentulous sites

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6
Q

Siebert Classification of edentulous ridges:
Class II

A

Normal ridge width
Loss of ridge height
3% of edentulous sites

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7
Q

Siebert Classification of edentulous ridges:
Class III

A

Facio-lingual loss of tissue width
Loss of ridge height
56% of edentulous sites

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8
Q

These pontics have zero tissue contact

A

Hygienic Pontic

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9
Q

All metal/Zr - 2 mm of clearance from gingiva

A

Hygienic Pontic

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10
Q

Hygienic Pontic provide
Good access for __
But are highly __

A

hygiene
unaesthetic

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11
Q

Hygienic Pontic are used only for

A

posterior FDPs

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12
Q

A pontic with a concave gingival surface that overlaps the ridge buccally and lingually

A

Ridge Lap Pontic (Saddle)

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13
Q

These pontics are not recommended and not hygienic

A

Ridge Lap Pontic (Saddle)

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14
Q

Combines the best features of the hygienic and saddle pontics (cleansability and esthetics)

A

Modified Ridge Lap Pontic

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15
Q

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

A

Modified Ridge Lap Pontic

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16
Q

All surface should be convex to allow hygiene

A

Modified Ridge Lap Pontic

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17
Q

Most common used pontic design

A

Modified Ridge Lap Pontic

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18
Q

Not esthetic
Indicated for posterior extraction sites with narrow alveolar ridge
Poor oral hygiene

A

Conical Pontic (egg-shaped, Bullet-shaped, Heart-shaped)

19
Q

Most aesthetic pontic design

A

Ovate Pontic

20
Q

Depression or hollow in the residual ridge, makes it look like it’s literally emerging from the gingiva

A

Ovate Pontic

21
Q

Used in cases where high esthetics is required (high smile line)

A

Ovate Pontic

22
Q

What are 3 different treatment approaches for an Ovate Pontic

A
  • Socket preservation techniques should be used to avoid the ridge collapse
  • Soft tissue graft can be made to an old extraction site to create more ridge volume
  • When there is adequate ridge volume , socket depression can be sculpted with electrosurgery or surgical diamonds
23
Q

A fixed dental prosthesis in which the pontic is cantilevered i.e. is retained and supported only on one end by one or more abutments

A

Cantilever pontic

24
Q

Why should a cantilever pontic never be an ideal TX plan

A

Unfavorable biomechanics
VERY high risk of failure

25
Q

What is the only case to consider a cantilever pontic

A

Replacing a maxillary lateral incisor
- pt should have very good posterior teeth support
- Pontic should have very light occlusal contact in all excentric movement positions

26
Q

What are the potential complications of the cantilever pontic

A
  • Torquing of abutment teeth
  • High risk of retainer decementation
27
Q

Biological Considerations with a pontic:
Tissue contact (2)

A
  • No contact or slight contact
  • Avoid too much pressure (soft tissue blanching)
28
Q

Biological Considerations with a pontic:
Oral hygiene considerations (2)

A
  • Main cause of tissue irritation is the accumulation of plaque between pontic and residual ridge
  • Patients need to be taught how to clean these surfaces (Superfloss, proxy brush, floss threader)
29
Q

Mechanical Considerations with a pontic:
Pontic material (2)

A
  • They should be reinforced with a strong framework (becuase they are exposed to increased amounts of load b/c they are long restorations)
  • Porcelain is too brittle - will break under flexure
30
Q

Mechanical Considerations with a pontic:
Available Pontic Materials (3)

A

Metal/ceramic (99% of pontics)
Resin veneered (not common)
Fiber-reinforced composite resin (very weak)

31
Q

High abrasion resistance (needs to be polished)
Good material stability and strengh

A

Metal/ceramic (99% of pontics)

32
Q

Low abrasion resistance
Dimensional change from water absorption
Mechanical retention (not chemical)

A

Resin veneered (not common)

33
Q

Substructure matrix of impregnated glass or polymer fiber provides structural strength

A

Fiber-reinforced composite resin (very weak)

34
Q

Mechanical Considerations with a pontic:
Occlusal Forces (2)

A
  • reducing the buccolingual width of the pontic by as much as 30% has been suggested to reduce the occlusal load on the retainers or/and to follow a narrow residual ridge
  • although watch out for : cheek or tongue biting, harmony of opposing occlusal relationship, bruxism
35
Q

Esthetic Considerations with a pontic:
Gingival interface (2)

A
  • The greatest challenge is to replicate for the gingival anatomic changes that occur after extraction
  • In most of the cases duplicating the facial contour of the crown is not enough to accomplish a nice esthetic outcome
36
Q

What are 3 options for the gingival interface of a pontic

A

Ridge augmentation (bone graft)
Connective tissue graft (soft tissue)
Pink porcelain

37
Q

The buccal plate is usually __ thick

A

0.5-1 mm

38
Q

After extraction, the __ is at high risk of resorption

A

buccal plate

39
Q

Buccal plate: What is recommended to conserve as much bone as possible

A

A socket preservation (bone graft)

40
Q

Esthetic Considerations with a pontic:
Correct __ is critical to esthetic pontic design

A

incisogingival height/ length

41
Q

A pontic should be interpreted as __

A

growing out of the gingival tissue

42
Q

Esthetic Considerations with a pontic:
Mesiodistal width

A

Tooth movement - frequently the available space for the pontic will be bigger or smaller of the contralateral tooth

43
Q

How to achieve proper mesiodistal width for a pontic

A

Orthodontics (1st option)
Visual perception pontic design

44
Q

Mesio-distal width
When replacing a posterior tooth it is possible to replicate the anatomy of the __ as the original tooth and then modifying the __ to accommodate the overall pontic shape

A

visible surfaces (mesial)
Non-visible surfaces (distal)

FP (3 decks)

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