Cementing Emax Crown
Cementing Emax Crown onto zirconia abutments involves a series of specific steps to ensure proper adhesion and stability. Here’s a general overview of the procedure based on recommended practices.
What Are the Steps for Cementing a Glass Ceramic Crown?
- Prepare the Emax Crown:
– Before starting, ensure the Emax crown is clean and free of contaminants.
- Surface Treatment of the Crown:
– Etch the internal surface of the crown with hydrofluoric acid after a try-in. This process enhances the bond strength between the crown and the abutment.
- Rinse and Dry:
– Rinse the crown thoroughly with water and air dry it using oil-free air. Ensure that there are no remnants of the etching material.
- Prepare the Zirconia Abutment:
– Mechanically clean the zirconia surface using pumice paste or a similar material. This helps to remove any contaminants, ensuring better bonding.
- Apply Bonding Adhesive:
– Apply a bonding adhesive (e.g., 3M™ Single Bond Universal Adhesive) to the bonding surface of the crown and rub it in for about 20 seconds. Air thin with oil-free air until the solvent evaporates, ensuring no pooling occurs.
6. Cement Application:
– Mix the chosen cement according to manufacturer instructions. For Emax crowns, a resin-based cement is typically preferred.
– Apply the cement into the crown using a mixing spatula and ensure an even application.
- Seat the Crown:
– Firmly seat the Emax crown onto the zirconia abutment using gentle finger pressure to avoid dislodging the crown.
- Curing the Cement:
– Immediately tack cure the cement for 1–2 seconds per surface to secure the crown temporarily while removing excess.
– Carefully remove excess cement with a scaler while holding the crown in place.
– Finally, light cure the cement for about 20 seconds per surface or allow for a dark cure as per the manufacturer’s guidelines.
- Finish and Polish:
– After curing, finish and polish the crown as necessary to ensure patient comfort and optimal aesthetics.
Tips:
– It is crucial to ensure that any temporary cement, desensitizers, or disinfectants are completely removed from the abutment, as these can interfere with bonding.
– Avoid using hydrogen peroxide (H2O2), EDTA, or sodium bicarbonate (NaHCO3) during the cleaning process on the tooth surfaces to prevent complications.
By following these steps, you can achieve a stable and durable bond between Emax crowns and zirconia abutments.
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The Best Cement for Emax Crowns
Using these substances can lead to issues such as postoperative sensitivity or interference with the bonding process. When cleaning the prepared tooth prior to cementation, the following precautions should be taken:
- Remove Residue: Ensure that any residues such as temporary cement, desensitizers, astringents, or disinfectants are completely removed from the tooth surface.
- Avoid Certain Substances: Do not use hydrogen peroxide (H2O2), EDTA (Ethylenediaminetetraacetic acid), or sodium bicarbonate (NaHCO3) during the cleaning process, as these can cause complications or sensitivity issues.
- Over-Drying Caution: Do not over dry the tooth after rinsing, as excessive drying can lead to postoperative sensitivity. It is crucial to maintain a moist environment on the tooth surface.
- Mechanical Cleaning: When cleaning the prepared tooth, consider using a pumice paste for mechanical cleaning, and ensure thorough rinsing afterward to eliminate any cleaning materials.
The best cement for Emax crowns is typically a resin-based adhesive cement, as it provides superior bonding strength and durability for glass-ceramic materials. Here are commonly recommended options:
- 3M™ RelyX™ Ultimate Adhesive Resin Cement: This dual-cure resin cement is an excellent choice for Emax crowns, as it allows for both light activation and self-curing. It offers high bond strength and easy application, making it ideal for glass ceramics.
- 3M™ RelyX™ U200 Self-Adhesive Resin Cement: This is another effective option, especially suitable for situations where an adhesive bond is required but without the need for a separate bonding agent. It simplifies the procedure and also provides good bond strength.
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Application Tips:
– Surface Preparation: It is critical to etch the Emax crown with hydrofluoric acid to enhance bonding. Rinse and air dry thoroughly before applying cement.
– Use of Bonding Adhesive: Applying a bonding adhesive such as 3M™ Single Bond Universal Adhesive can further improve bonding efficacy. Ensure proper application following the manufacturer’s guidelines, including air thinning to prevent pooling.
– Curing: Proper curing is essential for the effectiveness of the adhesive cement. Use a reliable curing light and follow recommended curing times—typically light curing for 20 seconds per surface after seating the crown.
Using these cement options with proper techniques ensures a strong and durable bond, minimizing the risk of complications associated with crown cementation.
Ideal Properties of Cement
These are my personal (not prioritized) thoughts on the optimum qualities of dental cement, based on decades of cementing crowns and permanent prostheses and observing whether those restorations work well or not:
– Not injuring the pulp of the teeth
– Antimicrobial Cariostatic
– Seals the edges
– Unsoluble in oral fluids
– Sticks to the structure of teeth—adhesive
– Radiopaque
– High power
– Minimal thickness of the film
– Acceptability of aesthetics, if necessary
– Simple to use
– Ideal hours for working and setting
– Moderate price
Emax Veneers: A Potential Risk
- Severe Tooth Decay: Addressing decay is crucial before veneer application.
- Advanced Gum Disease: Treatment is necessary to ensure veneer success and longevity.
- Severe Bruxism: Excessive grinding can damage veneers over time.