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Peds II > Preformed crowns > Flashcards

Preformed crowns Flashcards

1
Q

What crowns are not used in the anterior sector now?

A

Metallic

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2
Q

Options for anterior teeth reconstruction? (4)

A
  • Reconstruction with composite
  • Polycarbonate crowns
  • Composite reconstruction with Cellulose-Acetate
    crowns
  • Metallic crowns with esthetic front
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3
Q

Manual composite reconstruction for anterior teeth destructions?

A

It is not the chosen technique for great destruction

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4
Q

Great destructions in anterior

teeth reconstruction with cellulose acetate crowns ?

A
  1. Anesthesia and rubber dam isolation
  2. Removal of the caries
  3. Reduce the incisal height 2 mm
  4. Interproximal, labial and lingual reduction
  5. Pulp protection with GI
  6. Select the crown size depending on the mesio-distal
    diameter
  7. Cut the crown to give the proper anatomy and cut the two incisal
    angles
  8. Acid etching and clean
  9. Apply the adhesive and light-cure it for 2o seconds
  10. Fill the crown with the chosen composite (correct color)
    11.Place the crown in place with a soft and uniform pressure
  11. Light-cure all the surfaces
  12. Remove the crown
  13. Finishing and polishing
    Check occlusion!!
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5
Q

Great destructions in anterior

teeth metallic crowns with esthetic front?

A 
The have good esthetics.
The may:
- be bought
- be fabricated by us:
• Cement the metallic crown
• Open a window in the labial surface
• Substitute by composite
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6
Q

Great destructions in anterior

teeth policarbonate crown? (3)

A
  • Very good esthetics
  • Very expensive
  • Difficult to manipulate
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7
Q

Performed crowns used in..?

A

posterior sector

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8
Q

Preformed crowns principal characteristics? (8)

A

-They keep the mesio-distal diameter
- Proportionates a good marginal seal
- Restores the occlusion and the function
- It protects the tooth structure permanently
- It maintains the gingiva´s health
✤ Minimum preparation of the tooth structure
✤ Quick positioning for difficult cases
✤ Excellent function in the long term and comfort for the patient

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9
Q

Preformed crowns indications? (8)

A
  1. Extensive and complex caries
  2. After a pulp treatment
  3. Teeth with development alterations
  4. High risk of caries
  5. Handicapped patients
  6. Fractured molars
  7. Teeth non-stable enough for a space mantainer
  8. Patients under general anesthesia in teeth with 2 or more surfaces affected
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10
Q

Preformed crowns indication: extensive and complex caries? (4)

A

• Proximal caries very deep in cervical direction
• Cavity compromised by the prominence of the pulp
horns
• Affectation of one or more cusps
• Rampant bottle caries

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11
Q

Preformed crowns indication: after a pulp treatment?

A

Always crown, except by accidental exposition of the

pulp with only one wall affected

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12
Q

Preformed crowns counterindications? (2)

A
  • Tooth proximate to exfoliation (more than
    half the root reabsorbed)
    -Patient with allergies to nickel
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13
Q

Preformed crowns indications in permanent dentition? (3)

A

The may be used temporarily until the
growth is finished. We wait until:
✓The pulp chamber reduces its size
✓Migration and stabilization of the gingiva

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14
Q

Preformed crown types according to composition?

A
  • Stainless steel matallic crown
  • metallic crown with esthetic front
  • totally esthetic crowns
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15
Q

Stainless steel metallic crown composition? (3)

A
  • More steel (up to 70%)
  • Less content of nickel (9-12%)
  • Soft and malleable
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16
Q

Preformed crown types according to free edge? (2)

A
  • Metallic crowns with preformed free edge

- Metallic crowns with non-preformed free edge

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17
Q

Metallic crowns with preformed free edge? (2)

A
  • Reproduction of the cervical tubercle

* Shorter occluso-gingivally

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18
Q

Metallic crowns with non-preformed free edge? (2)

A

Same size M-D and V-L in gingival and in occlusal

• Longer occluso-gingivally

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19
Q

Preformed crown technique number of steps?

A

8

20
Q

Preformed crown technique steps 1-4

A
  1. Evaluation of the occlusion and anesthesia
  2. Selection of the crown
  3. Isolation
  4. Removal of the caries and pulp treatment (if necessary)
21
Q

Preformed crown technique steps 5-8?

A
  1. Preparation of the tooth
  2. Try on the crown
  3. Adaptation of the crown
  4. Cementation of the crown
22
Q

Preformed crowns tooth preparation number of steps?

A

4

23
Q

Preformed crown tooth preparation step 1?

A

Explore the occlusion

24
Q

Preformed crown tooth preparation step 2? (4)

A

Reduce the occlusal surface
• 169L tungsten bur
• Make guide grooves of 1,5-1,2 mm
• respect the dental anatomy

25
Q

Preformed crown tooth preparation step 3?

A

Explore the occlusion (a space of 1mm has to

remain between molars)

26
Q

Preformed crown tooth preparation step 4? (5)

A

• Bur parallel to the tooth axis, or with a slight
convergence towrds occlusal (10º)
• Occluso-gingival saw movements in labio-lingual
sense
✦ Do not leave steps
✦ Prepare slightly subgingivally
✦ The lingual and labial surfaces are NOT prepared

27
Q

Preformed crowns crown preparation number of steps?

A

5

28
Q

Preformed crowns crown preparation step 1?

A 
Selection of the crown
• Measurement of the mesiodistal diameter before
preparing the tooth
• Procedure of try and error
(placing from lingual to labial)
29
Q

Preformed crowns crown preparation step 2? (4)

A

Crown´s height
• Edge 1mm subgingivally
• Check for ischemia of the gingiva
• Check the occlusion

30
Q

Preformed crowns crown preparation step 3?

A

Crown trimming with crown shears and polishing with abrasive burs

31
Q

Preformed crowns crown preparation step 4?

A

Crown crimping: When we trim the crown´s edge, the preformed area is lost, so it may be necessary to crimp the edge with crown pliers

32
Q

Preformed crowns crown preparation step 5? (4)

A

. Polishing of the crown´s edge
• Slow speed polishing bur
• Internal and external surfaces
• Reduction of cervical edge

33
Q

Preformed crowns cementation? (4)

A

✦We place the crown the same way we tried
it.
✦We remove the excess of cement with a
probe and dental floss
- We must check correctly the occlusion to not
produce alterations
- Very subgingival crowns may produce periodontal
abscess

34
Q

Crowns with esthetic

front? (3)

A

✤More difficult to manipulate
✤More aggressive tooth preparation (2mm in
occlusal surface)
✤The fitting of the occlusion

35
Q

Preformed crowns in

permanent molars?

A

The tooth preparation is the same as in primary dentition, but preparing also the labial and lingual surfaces

36
Q

Preformed crowns.

Special situation types? (4)

A
  1. Simultaneous preparation of two adjacent teeth
  2. Preparation in quadrants with space loss
  3. Simultaneous preparation of crown and a class II cavity
  4. Preparation for a crown on a triangular first lower primary molar
37
Q

Preformed crowns - Special situations: Simultaneous preparation of two adjacent teeth? (4)

A

• Preparation of each tooth separately
• Interproximal space at the gingiva of 1,5 mm
• Simultaneous try of both crowns (better start
positioning the distal)
• Cementation in the same order as the last try

38
Q

Preformed crowns - Special situations: Preparation in quadrants with space loss? (2)

A

• Reduction of mesio-distal diameter with the
contouring pliers
• The labio-lingual diameter increases, so
crimping is necessary for a correct adaptation

39
Q 
Preformed crowns - Special situations: Simultaneous preparation of crown and a
class II cavity? (2)
A

• Cement the crown before removing the caries of
the class II
• Place a matrix before cementing the crown

40
Q

Preformed crowns - Special situations: Preparation for a crown on a triangular
first lower primary molar

A

• Place a crown of a contralateral uppers first

primary molar

41
Q

Preformed crowns. More

frequent problems? (8)

A
  • SLOPING OCCLUSAL PLANE:
  • EXCESSIVE INCLINATION TOWARDS LABIAL OR LINGUAL
  • CROWN MOBILITY BECAUSE OF ABSENCE OF RETENTION
  • CEMENTATION OF A CROWN TOO BIG
  • PERFORATION OF THE CROWN
  • ASPIRATION OR INGESTION OF THE CROWN
  • GINGIVAL IRRITATION
  • FRACTURE OF THE ESTHETIC FRONT OR NOT ENOUGH PREPARATION: In esthetic
    crowns
42
Q

Preformed crowns. More

frequent problems: sloping occlusal plane?

A 
- Existence of an interproximal step and/or deficient
occlusal preparation
- The most frequent reason
is the presence of an
interproximal step
43
Q

Preformed crowns. More

frequent problems: EXCESSIVE INCLINATION TOWARDS LABIAL OR LINGUAL? (3)

A

• Great destruction of one of the walls
• Small crown
• Presence of a step on the labial or lingual
surface

44
Q

Preformed crowns. More

frequent problems: CROWN MOBILITY BECAUSE OF ABSENCE OF RETENTION?

A

• Prepare more the tooth and use a smaller

crown, crimping it in the central area to reestablish the contact points

45
Q

Preformed crowns. More

frequent problems: CEMENTATION OF A CROWN TOO BIG? (3)

A

• Alterations of the periodontal and gingival
health
• Oclussion alterations
• Alterations of the eruption of the first
permanent molar

Peds II (11 decks)

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