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NX3 Nexus Third Generation FAQs

NX3
     

Key Features and Competitive Advantage

What are the key advantages that NX3 offers the dentist?
NX3 Nexus Third Generation is the new esthetic permanent resin cement:

  • Delivers unmatched esthetics
  • Long-term color stability
  • Universally indicated for all indirect applications, including veneers
  • Enhanced adhesion to all substrates
  • Great compatibility with both total-etch and self-etch (including 7th generation) adhesives
  • Excellent handling properties (non-slumpy consistency and easy cleanup)
What advantages does Kerr's proprietary redox initiator system provide?
NX3 uses a BPO-free/amine-free redox initiator system that:
  • Delivers superb color stability before, during and after curing
  • Resolves bonding incompatibility issues with acidic adhesives that are common with other resin cements
Therefore, NX3 is compatible with both total-etch and self-etch adhesives.

This compatibility also helps eliminate the need for a dual-cure activator for the adhesive.
Acidic adhesives refer to 5th to 7th generation bonding agents that include both total-etch (e.g., OptiBond Solo Plus) and self-etch (e.g., OptiBond All-in-One) adhesives.

  • Provides optimal gel/set time stability.
Is NX3 indicated for all types of restorations?
Yes, NX3 can be used for cementation of ceramic-based (including CAD/CAM blocks and zirconia-/alumina-strengthened ceramics), resin-based, and metal-based restorations including:
1. Veneers
2. Inlays and onlays
3. Crowns and bridges
4. Posts

NX3 can also be used for adhesive bonding of amalgam restorations and as a core-buildup material.

Protocol Guidelines

When cementing posts, how does the bonding at the adhesive/cement interface work?
NX3 will mix with the adhesive when NX3 is in contact with the adhesive and the curing of NX3 (self-cured or dual-cured) will also initiate the curing of the adhesive, copolymerizing the adhesive and cement together.
How does tack curing accelerate gel state affect the overall work time?
Tack curing the cement hastens the gelling of the cement. Once the cement has gelled, it can no longer be manipulated.
Why is NX3 Dual-Cure cement suited for a core build-up procedure?
NX3 is indicated for all restorations, including core buildup, because it is compatible with all bonding agents even when bulk-built. It does not require a dual-cure activator to resolve incompatibility with the adhesives.

Please describe the protocol for using NX3 as a core build-up material.
  • After completion of post cementation, etch (if using a total-etch adhesive such as OptiBond Solo Plus) and apply the adhesive to the prep, dry and light-cure the adhesive according to each adhesive's directions for use.
  • Dispense the mixed NX3 Dual-Cure around the post and onto the prepared tooth.
Notes:
The mixed NX3 can optionally be loaded with a Unidose tip and dispensed onto the prepared tooth.
The mixed NX3 can also optionally be loaded into the appropriate CoreForm and seated onto the prepared tooth.

  • Clean any excess material.
  • The mixed NX3 will cure to a hard set approximately 6 minutes after being placed on the prepared tooth. The set may be accelerated by curing with a curing light for 30 seconds per surface. It is recommended that the light-curing be delayed for a minimum of 3 minutes to minimize the negative effect of shrinkage stress as the material is bulk-cured in this case.
  • Check hardness of NX3 with an explorer before final finishing. Using a diamond or carbide bur, remove any flash or excess NX3, shape and finish preparation.
  • The finished NX3 is ready for an impression.

Other Technical Information

What is the Vita®  cross reference for each NX3 shade name?
NX3 SHADE
VITA SHADE
Clear
Lighter than B1
White B1
Yellow A3
White Opaque
Lighter than B1
Bleach
Lighter than B1

Describe how radiopacity is measured.
 How low a percentage can a cement's radiopacity be before it becomes non-radiopaque?
Radiopacity is measured by taking an X-ray of a dental product alongside aluminum and then comparing the X-ray absorbing power (optical density) of both X-rays.

If the X-ray absorbing power for the dental product is the same as that for aluminum, then the radiopacity of the dental product is 100% of aluminum.

If the X-ray absorbing power for the dental product is 2 times as strong as that for aluminum, then the radiopacity of the dental product is 200% of aluminum.

Dentin has a radiopacity of 100% of aluminum and enamel has a radiopacity slightly less than 200% of aluminum.

To be called radiopaque, the radiopacity of the cement must be equal to or greater than that of dentin (≥ 100%).

Generally, a cement with a radiopacity of less than 100% of aluminum is called radiolucent (or not radiopaque).
What is the filler load by volume for NX3?
43.3% for NX3 Dual-Cure
47.7% for NX3 Light-Cure
Why are bond strengths lowest to LAVA restorations?
A Zirconia substrate (e.g., LAVA) is different from porcelain and is generally more difficult to bond to. Zirconia is more resistant to acid than porcelain. Bonding to Zirconia will always be lower compared with other substrates.
This is true with other adhesives/cements.

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