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Ask the Experts Answer

Question Asked on 1/17/2017
 

What is your recommended sequence of procedures and materials for porcelain repair on crowns?

Answer Response by Dr. Nuñez on 1/18/2017
 

BISCO’s Intraoral Repair Kit provides all the materials necessary to repair the framework of broken or damaged restorations intraorally. Once the operative site is properly prepared, an esthetic and durable repair can be successfully achieved utilizing a resin composite material. The Intraoral Repair Kit is a cost effective option as a practical restorative solution and comes complete with BISCO’s Z-Prime™Plus, Porcelain Primer, Porcelain Bonding Resin, Dual-Cured Opaquer, Porcelain Etchant (9.5% HF) and Barrier Gel.

 

Repair of Porcelain Restorations: 

1. Isolate the area to be repaired. 

2. Remove the glaze & bevel (45 degree) the porcelain around the area to be repaired. 

3. Place BARRIER GEL on gingival tissue that may be exposed or on porcelain to protect areas where etching is not desired. 

4. Remove cap from PORCELAIN ETCHANT, securely attach dispensing tip and verify etchant flow prior to applying intraorally. Apply PORCELAIN ETCHANT (9.5% HF) to the dry porcelain surface for 90 seconds. Continue to observe the etch site throughout the entire procedure. Suction the PORCELAIN ETCHANT, then rinse with a copious amount of water and air dry. The etched surface should appear dull and frosty (if porcelain has a white/chalky appearance, agitate a moist microbrush on the porcelain to remove salt and debris created by etching, rinse and dry). 

NOTE: Porcelain may be sandblasted or abraded with a coarse diamond bur as an alternative to Hydroflouric Acid Etching. 

5. Apply 1 coat of PORCELAIN PRIMER to the etched porcelain surface and allow to dwell for 30 seconds. Dry with air syringe. 

6. Apply a thin layer of PORCELAIN BONDING RESIN to the repair site. Spread composite evenly over the surface and light cure.

Repair of Porcelain-Fused-to-Metal Restorations: 

1. Isolate the area to be repaired. 

2. Remove the glaze & bevel (45°) the porcelain around the area to be repaired. 

3. Place BARRIER GEL on gingival tissue that may be exposed or on porcelain to protect areas where etching is not desired.

4.Remove cap from PORCELAIN ETCHANT, securely attach dispensing tip and verify etchant flow prior to applying intra orally. Apply PORCELAIN ETCHANT (9.5% HF) to the dry porcelain surface for 90 seconds. Continue to observe the etch site throughout the entire procedure. Suction the PORCELAIN ETCHANT, then rinse with a copious amount of water and air dry. The etched surface should appear dull and frosty (if porcelain has a white/chalky appearance, agitate a moist microbrush on the porcelain to remove salt and debris created by etching, rinse and dry). 

NOTE: Porcelain may be sandblasted or abraded with a coarse diamond bur as an alternative to Hydroflouric Acid Etching. 

5. Apply 1 coat of PORCELAIN PRIMER to the etched porcelain surface and allow to dwell for 30 seconds. Dry with air syringe. 

6. Apply 1 coat of Z-PRIME Plus to the exposed metal/zirconia/alumina & dry with an air syringe for 3-5 seconds. 

7. If metal masking is required, shake OPAQUER Base and Catalyst bottles well before dispensing. Dispense one drop each of Catalyst and Base onto a mixing pad, and mix with a brush tip. Apply a thin coat of OPAQUER only to the metal surface and allow to self cure, or light cure for 5 seconds. An oxygen inhibited layer will be present on the surface once the curing process has completed. This is normal for this material. 

8. Apply a thin layer of PORCELAIN BONDING RESIN to the repair site. Spread composite evenly over the surface and light cure. 9. Complete the repair using composite and finish/polish.
9. Complete the repair using composite and finish/polish.

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