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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?

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?

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
Preformed crown tooth preparation step 3?
Explore the occlusion (a space of 1mm has to | remain between molars)
26
Preformed crown tooth preparation step 4? (5)
• 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
Preformed crowns crown preparation number of steps?
5
28
Preformed crowns crown preparation step 1?
``` Selection of the crown • Measurement of the mesiodistal diameter before preparing the tooth • Procedure of try and error (placing from lingual to labial) ```
29
Preformed crowns crown preparation step 2? (4)
Crown´s height • Edge 1mm subgingivally • Check for ischemia of the gingiva • Check the occlusion
30
Preformed crowns crown preparation step 3?
Crown trimming with crown shears and polishing with abrasive burs
31
Preformed crowns crown preparation step 4?
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
Preformed crowns crown preparation step 5? (4)
. Polishing of the crown´s edge • Slow speed polishing bur • Internal and external surfaces • Reduction of cervical edge
33
Preformed crowns cementation? (4)
✦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
Crowns with esthetic | front? (3)
✤More difficult to manipulate ✤More aggressive tooth preparation (2mm in occlusal surface) ✤The fitting of the occlusion
35
Preformed crowns in | permanent molars?
The tooth preparation is the same as in primary dentition, but preparing also the labial and lingual surfaces
36
Preformed crowns. | Special situation types? (4)
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
Preformed crowns - Special situations: Simultaneous preparation of two adjacent teeth? (4)
• 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
Preformed crowns - Special situations: Preparation in quadrants with space loss? (2)
• Reduction of mesio-distal diameter with the contouring pliers • The labio-lingual diameter increases, so crimping is necessary for a correct adaptation
39
``` Preformed crowns - Special situations: Simultaneous preparation of crown and a class II cavity? (2) ```
• Cement the crown before removing the caries of the class II • Place a matrix before cementing the crown
40
Preformed crowns - Special situations: Preparation for a crown on a triangular first lower primary molar
• Place a crown of a contralateral uppers first | primary molar
41
Preformed crowns. More | frequent problems? (8)
- 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
Preformed crowns. More | frequent problems: sloping occlusal plane?
``` - Existence of an interproximal step and/or deficient occlusal preparation - The most frequent reason is the presence of an interproximal step ```
43
Preformed crowns. More | frequent problems: EXCESSIVE INCLINATION TOWARDS LABIAL OR LINGUAL? (3)
• Great destruction of one of the walls • Small crown • Presence of a step on the labial or lingual surface
44
Preformed crowns. More | frequent problems: CROWN MOBILITY BECAUSE OF ABSENCE OF RETENTION?
• Prepare more the tooth and use a smaller | crown, crimping it in the central area to reestablish the contact points
45
Preformed crowns. More | frequent problems: CEMENTATION OF A CROWN TOO BIG? (3)
• 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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