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Prostho > FPD > Flashcards

FPD Flashcards

1
Q

ABSOLUTE contraindication for bruxism

A

(Full ceramic, FPD’s )
Porcelain
Zirconia

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2
Q

Largest tooth in the whole mouth

A

Maxillary first molar

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3
Q

Smallest tooth in the whole mouth

A

Mandibular central incisor

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4
Q

In an FPD, the limitation of a Pontiac

A

We can replace only up to 3 missing teeth

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5
Q

Moderately compromised edentulous area

A

Even if one canine missing in the arch

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6
Q

Totally healthy tooth with perfect pulpal system do we need to do an RCT when capping the tooth

A

No, it is not recommended in Canada

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7
Q

The height of the proximal plate

A

it will be starting actually UNDERNEATH the MARGINAL RIDGE of the abutment and then extend completely the proximal surface of the tooth .
Initial 1.5-2 mm has contact and then under the minor connector or base of RPD we have relief.

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8
Q

Decreased horizontal labial angle

A

When patient loses all the teeth, the lips will collapse, and the label angle decreases

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9
Q

Columella philtrum angle or nasolabial angle in a CD pt.

A

This angle will be INCREASED as the patient has lost all teeth and the lip collapses

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10
Q

Consequence of losing all teeth

A

Nasolabial angle will increase

Horizontal lip angle will decrease

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11
Q

Optimal crown root ratio

A

2:3

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12
Q

Ideal crown root ratio

A

1:1

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13
Q

Edentulous Ridge classification

A

1 ideally or minimally compromised edentulous area
. Single arch
.Anterior maxillary span, not exceeding 2 missing incisors
. Anterior mandibular span not exceeding 4 missing incisors
. Any posterior maxillary or mandibular spend not exceeding 2 premolars or 1 premolar, and 1 molar.

  1. Moderately compromised area.
    . The above conditions in both arches.
    . If Max or mandibular, canine is missing.
    Canine is very important
  2. Substantially compromised edentulous area.
    Any posterior maxillary, or mandibular span greater than 3 missing teeth or two molars
    Any edentulous span including anterior or posterior area of three or more missing teeth
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14
Q

The absolute maximum number of posterior teeth, which can be safely replaced with a fixed bridge

A

3
(only under ideal conditions)

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15
Q

When should we give a removable partial denture?

6

A
  1. an edentulous, space with NO distal abutment.
  2. A severe loss of tissue in the edentulous ridge
    3 an insufficient number of abutments longer span or missing teeth is greater than three
  3. Periodontally weakened primary abutment…. As cross art stabilization will help support little better distribution of RPD forces.
  4. An E dentulous fees involving four adjacent teeth, other than the four incisors
  5. If more than one Edentulous , space exists in the same arch.
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16
Q

Contraindications for fixed bridge work
7

A
  1. Poor oral hygiene.
  2. Hi cries rate
  3. Multiple spaces in the arch or teeth likely to be lost soon.
  4. Unacceptable occlusion.
  5. Severe BRUXISM, especially for full ceramic FPD’s
  6. If the clinical skill and technical skill of the dentist do not match the demands of the case
  7. Severe residue ridge resorption in anterior area, especially in patients with GUMMY smile.
17
Q

RCT treated tooth

A

If the tooth is properly, treated, endodontically,it can well serve as an abutment with a post and core foundation for retention and strength

18
Q

In an FPD a discrepancy between CO nd CR

A

It should be evaluated. Also, the forces of mastication and aesthetic considerations should be reviewed.

19
Q

occlusion records for treatment planning for an FPD bridge should be matched at
CR or CO?

A

CR

20
Q

Cantilevers

A

FPD’s’s in which only one side of the Pontic is attached to a retainer
Once it has abutment on the other side is free
Example lateral incisor

Important : cantilever is usually considered for 1 TOOTH

21
Q

Prerequisites of a lateral incisor cantilever

A

Canines should be healthy

Periodontal support should be good

Occlusion should be favourable

No, bone loss at all

22
Q

Disadvantages of a cantilever

A

Induces lateral forces on the supporting tissue, which may cause tipping rotation, or drifting of the abutments

One abutment is not enough

So we use multiple abutment teeth with sound periodontal support

23
Q

Important points for a cantilever

A

Forces are best tolerated by the periodontal supporting structures, when directed along the LONG AXIS of the tooth

Cantilever FPD’s should replace only 1 tooth and have at least 2 abutments

When replacing a maxillary literal incisor, the canine used as an abutment should have a long root and a good bone support

There should be a REST on the MESIAL of the pontic against the restoration in an inlay or other metallic restorations to prevent rotation of the pontic and abutment

24
Q

To give cantilever in a posterior too

A

We need to have 2 ABUTMENTS as we chew from posterior tooth. All the tooth may become mobile.

25
Q

To give cantilever for missing first molar

A

We need to consider, if size of Pontiac, is same as the size of the replaced tooth, then too much force on the middle abutment the middle abutment will be acting like a fulcrum
Therefore, the considerations are:

Change the size of the pontic to a premolar and not a molar

In maximum Intercuspation, we should have light occlusion contact

No contact between teeth on excursion

26
Q

connecter-important point

A

Should occupy the normal interproximally contact area.It should be large enough for STRENGTH but not so large as to IMPEDE PLAQUE CONTROL

27
Q

Important point

A

An anterior fixed bridge is contra indicated when there is a considerable resorption of the residual ridge

example in trauma cases

28
Q

If a tooth is properly treated endodontically

A

It can serve well as an abutment with a POST AND CORE foundation for retention and strength

29
Q

The rest on pontic

A

Should be on the mesial of the Pontic against a rest preparation in an inlay or other metallic restoration

Should be on the distal of central incisor to prevent rotation of the Pontic and abutment

30
Q

Cantilever anterior teeth

A

No contact

on CO as well as lateral excursions

31
Q

For cantilever to replace the first premolar

A

Full veneer retainers are used on the second premolar and first molar abutments

32
Q

Available materials for FPD

A

1.Cast metal:
Intracoronal restorations (inlays)
Extra coronal restorations (crowns )

  1. Metal ceramic material PFM.
  2. Fibre reinforced resin.
  3. Complete ceramic.
33
Q

Intracoronal restorations ( inlays)

A

They rely on the strength of the remaining tooth structure for support and retention

Greater tooth bulk is needed to resist any vegging affect on the preparation walls

Contraindication -significantly weakened tooth

34
Q

Extracoronal restorations Crowns

A

Encircle, all or part of the remaining tooth structure and the occlusal surface

The Crown strengthen and protects the teeth weekend by caries or trauma

35
Q

Onlay

A

And only is an inly, which covers the cusps..but does not go all the way to the gingiva

They provide BETTER PROTECTION than inlay, but often LACK RETENTION

36
Q

Metal ceramic, PFM

A

It’s amongst the least, conservative treatment especially Buccally

is used when a complete crown is needed to restore appearance and function

37
Q

Fibre reinforced resin

A

Excellent marginal, adaptation, and aesthetics

Disadvantage : do not withstand functional load well overtime

Example INTEGRITY

Use: long-term interim restorations

38
Q

Complete ceramics

A

Most aesthetic and least conservative

These days the current focus is to improve the strength of aesthetic restoration on either veneering, a high strength, alumina, zirconia, spinel, or lithium disilicate core..with the more translucent porcelain are using a leucite reinforced translucent materials..

39
Q

Monolithic aesthetic, restorations

A

the strongest, ceramic restorations

colored monolith zirconium crowns, have very acceptable aesthetics for posterior teeth

Prostho (4 decks)

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