Preformed crowns Flashcards
What crowns are not used in the anterior sector now?
Metallic
Options for anterior teeth reconstruction? (4)
- Reconstruction with composite
- Polycarbonate crowns
- Composite reconstruction with Cellulose-Acetate
crowns - Metallic crowns with esthetic front
Manual composite reconstruction for anterior teeth destructions?
It is not the chosen technique for great destruction
Great destructions in anterior
teeth reconstruction with cellulose acetate crowns ?
- Anesthesia and rubber dam isolation
- Removal of the caries
- Reduce the incisal height 2 mm
- Interproximal, labial and lingual reduction
- Pulp protection with GI
- Select the crown size depending on the mesio-distal
diameter - Cut the crown to give the proper anatomy and cut the two incisal
angles - Acid etching and clean
- Apply the adhesive and light-cure it for 2o seconds
- Fill the crown with the chosen composite (correct color)
11.Place the crown in place with a soft and uniform pressure - Light-cure all the surfaces
- Remove the crown
- Finishing and polishing
Check occlusion!!
Great destructions in anterior
teeth metallic crowns with esthetic front?
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
Great destructions in anterior
teeth policarbonate crown? (3)
- Very good esthetics
- Very expensive
- Difficult to manipulate
Performed crowns used in..?
posterior sector
Preformed crowns principal characteristics? (8)
-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
Preformed crowns indications? (8)
- Extensive and complex caries
- After a pulp treatment
- Teeth with development alterations
- High risk of caries
- Handicapped patients
- Fractured molars
- Teeth non-stable enough for a space mantainer
- Patients under general anesthesia in teeth with 2 or more surfaces affected
Preformed crowns indication: extensive and complex caries? (4)
• 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
Preformed crowns indication: after a pulp treatment?
Always crown, except by accidental exposition of the
pulp with only one wall affected
Preformed crowns counterindications? (2)
- Tooth proximate to exfoliation (more than
half the root reabsorbed)
-Patient with allergies to nickel
Preformed crowns indications in permanent dentition? (3)
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
Preformed crown types according to composition?
- Stainless steel matallic crown
- metallic crown with esthetic front
- totally esthetic crowns
Stainless steel metallic crown composition? (3)
- More steel (up to 70%)
- Less content of nickel (9-12%)
- Soft and malleable
Preformed crown types according to free edge? (2)
- Metallic crowns with preformed free edge
- Metallic crowns with non-preformed free edge
Metallic crowns with preformed free edge? (2)
- Reproduction of the cervical tubercle
* Shorter occluso-gingivally
Metallic crowns with non-preformed free edge? (2)
Same size M-D and V-L in gingival and in occlusal
• Longer occluso-gingivally