Pontic

Question 1

What’s the ideal residual bridge characteristics?

Answer 1

1. An ideally shaped ridge has a smooth, regular surface of attached gingiva, which facilitates maintenance of a plaque-free environment
2. Its height and width should allow placement of a pontic that appears to emerge from the ridge and mimics the appearance of the neighboring teeth
3. Facially, it must be free of frenum attachment and be of adequate facial height to sustain the appearance of interdental papillae

Question 2

Loss of residual ridge contour complications?

Answer 2

unesthetic open gingival embrasures, food impaction and percolation of saliva during speech

Question 3

What’s Class I defects of residual ridge ?

Answer 3

facio-lingual ( buccolingual ) loss of tissue width with normal ridge height

Question 4

What’s Class II defects of residual ridge ?

Answer 4

loss of ridge height ( apical-coronal ) with normal ridge width

Question 5

What’s Class III defects of residual ridge ?

Answer 5

a combination of loss in both dimensions
Buccolingual + apicocoronal

Question 6

Class 2 and 3. Consideration before prosthodontics?

Answer 6

preprosthetic surgery to augment such residual ridges should be carefully considered

Few soft tissue surgical techniques can increase the height of a residual ridge with predictability

Question 7

Which class Surgical augmentation of ridge width is uncommon.

Answer 7

Class 1

Question 8

Resorption occurs primarily at which surface ?

Answer 8

buccal plate, resulting in a horizontal defect

Question 9

How much bone loss after 6 months and 1 year ?

Answer 9

Bone loss averages 3 to 5 mm at 6 months after extraction

50% of the width of the alveolar ridge is lost at 12 months

Question 10

Which methods aims in Gingival Architecture Preservation ?


Answer 10

1.The alveolar process can be preserved through ( immediate restorative and periodontal intervention )

2. Conditioning the extraction site and providing a matrix for healing -preserving the preextraction gingival architecture
3. An interim FDP can be fabricated indirectly, ready for immediate insertion

Question 11

What’s the advantages of Gingival Architecture Preservation ?


Answer 11

1. Aim of preserving the facial plate of bone
2. The scalloped architecture of interproximal bone is essential for proper papilla form
3. An interim FDP can be fabricated indirectly, ready for immediate insertion
4. Immediately after preparation of the extraction site, a carefully shaped interim FDP is placed

Question 12

When to prepare the abutment if want to do Gingival Architecture Preservation?


Answer 12

Before extraction

Question 13

What’s sanitary / hygienic abutment disadvantages ?

Answer 13

1. entrapment of food particles, which may lead to tongue habits
2. Is the least toothlike design and is reserved for teeth seldom displayed during function
3. is shaped like an archway between the retainers

Question 14

What’s the modification of the prosthetic when we use hygienic Pontic ?

Answer 14

Increased connector size and a decrease in the stress concentrated in the pontic and connectors

Question 15

What’s the saddle ridge lap ?

Answer 15

1. Has a concave fitting surface that overlaps the residual ridge buccolingually, simulating the contours and emergence profile of the missing tooth on both sides of the residual ridge
2. Should be avoided because the concave gingival surface of the pontic is not accessible to cleaning with dental floss

Question 16

In which situation not preferable to use conical Pontic and what instead ?

Answer 16

1. May be unsuitable for broad residual ridges because the emergence profile associated with the small tissue contact point may create areas of food entrapment
   The sanitary or hygienic pontic is the design of choice in these clinical situations
2. Esthetic regions

Question 17

What’s the modified ridge lap and its characteristics ?

Answer 17

1. Combines the best features of the hygienic and saddle pontic designs, combining esthetics with easy cleaning
2. Overlaps the residual ridge on the facial side but remains clear of the ridge on the lingual side

Question 18

What’s the characteristics that the modified ridge lap most have ?

Answer 18

1. To enable optimal plaque control, the gingival surface must have no depression or hollow
2. It should be as convex as possible from mesial to distal aspects
3. Facial ridge adaptation is essential for a natural appearance.

Question 19

What’s the super esthetic Pontic ?

Answer 19

Ovate then comes the modified ridge lap

Question 20

What’s the design of ovate Pontic ?

Answer 20

Its convex tissue surface resides in a soft tissue depression or hollow in the residual ridge, which makes it appear that a tooth is literally emerging from the gingiva

Question 21

What does ovate Pontic require to set ?

Answer 21

1. Socket-preservation techniques should be performed at the time of extraction
2. For a preexisting residual ridge, surgical augmentation of the soft tissue is typically required
3. When an adequate volume of ridge tissue is established, a socket depression is sculpted into the ridge

Question 22

In what argumention serve when we use ovate Pontic ?

Answer 22

With ridge augmentation, its emergence from the ridge appears identical to that of a natural tooth

Question 23

What’s advantages of ovate ?

Answer 23

1. Its recessed form is not susceptible to food impaction
2. It is accessible to dental floss
3. Super esthetic

Meticulous oral hygiene is necessary to prevent tissue inflammation resulting from the large area of tissue contact

Question 24

What’s happen if support of the interim ovate pontic depression doesn’t done ?

Answer 24

The socket depression, with its pseudopapillae, will collapse when the interim restoration is removed before an impression is made

Question 25

To compensate for this three-dimensional change in the socket that occurs during the impression making what should we do ?

Answer 25

it is necessary to scrape the cast in this area to ensure positive contact and support of the pseudopapillae with the definitive pontic

Question 26

How does modified ovate Pontic site and its advantages ?

Answer 26

Apex positioned more facially on the residual ridge, rather than at the crest of the ridge

Cleansing of this pontic is also purported to be easiest of all pontic types

Question 27

In which cases we use modified ovate Pontic ?

Answer 27

It’s alteration allows the use of the pontic in clinical scenarios in which

horizontal ridge width is not sufficient for a conventional ovate pontic

Question 28

How does biological considerations of Pontic should be ?

Answer 28

1. Pressure-free contact prevents ulceration and inflammation of the soft tissues
2. Passive contact should occur exclusively on keratinized attached tissue
3. Ovate pontics maintain positive tissue contact to support the pseudopapillae
4. Healthy mucosa can be maintained if the contact to the mucosa is tight but noncompressive and the gingival portion of the pontic is regularly cleaned
5. If any blanching of the soft tissues is observed, the pontic should be recontoured until tissue contact is entirely passive

Question 29

Why biological considerations are important ?

Answer 29

1. The biologic principles of pontic design pertain to the maintenance and preservation of the residual ridge, abutment and opposing teeth, and supporting tissues

2.Factors of specific influence are pontic-ridge contact, amenability to oral hygiene, and the direction of occlusal forces

Question 30

How to maintain oral hygiene ?

Answer 30

1. Gingival embrasures around the pontic should be wide enough to allow oral hygiene aids
   To prevent food entrapment, they should not be opened excessively
2. To enable passage of floss over the entire tissue surface, tissue contact between the residual ridge and pontic must be passive
3. If the pontic has a depression or concavity in its gingival surface, plaque accumulates and tissue irritation follows , This is usually reversible
4. Accurate description of pontic design and correcting if necessary before cementation

Prevention is the best solution for controlling tissue irritation

Question 31

Which material the easiest to keep clean ?

Answer 31

Highly glazed porcelain

For easier plaque removal and biocompatibility, the tissue surface of the pontic should be made in glazed porcelain

Question 32

Why ceramic contraindicated in edentouloys patient ?

Answer 32

In areas where there is minimal distance between the residual ridge and the occlusal surface

Question 33

What considerations if we use metal ?

Answer 33

If metal is placed in tissue contact, it should be highly polished

Question 34

Why we should carefully use good material ?

Answer 34

To prevent tissue inflammation and polished surfaces easy to clean

Question 35

Which prodesposing factors for mechanical failure ?

Answer 35

improper choice of materials, poor framework design, poor tooth preparation, or poor occlusion

These factors can lead to fracture of the prosthesis or displacement of the retainers

Question 36

Why Long-span posterior FDPs are particularly susceptible to mechanical problems ?

Answer 36

Inevitably, significant flexing occurs as a result of high occlusal forces and because the displacement effects increase with the cube of the span length

Question 37

When appearance is of utmost concern, what can we do ?

Answer 37

the ovate pontic, used in conjunction with alveolar preservation or soft tissue ridge augmentation,
can provide an appearance at the gingival interface that is virtually indistinguishable from that of a natural tooth

Question 38

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