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Microsites

VITA NP BOND: stable bonding of CoCr frameworks with ceramic ensures long-term success

VITA NP BOND (NP: non-precious) provides the user with greater reliability and enables improved esthetics when it comes to veneering non-precious metal alloys. Through reliable bonding between the metal framework and the veneering ceramic, the new VITA NP BOND material helps prevent errors occurring as a result of CTE* tension between the alloy and the ceramic.

In this newsletter you will find out more about VITA NP BOND. Moreover you can read how the new bonding agent was developed and what needs to be observed when processing the product.

VITA NP BOND

Again and again, errors, such as cracks, occur when veneering specific precious metal-free alloys based on cobalt-chromium (CoCr). These cracks are often due to differences in the thermal behavior of ceramics and metal, which lead to stress between both materials.

The new VITA NP BOND compensates for these differences and offers you greater reliability for the fabrication of ceramic veneers with long-term stability, such as veneers made from VITA VMK MASTER and VITA VM 13. The new NP bonder improves bonding of substructure and veneer, especially for precious metal-free alloys.

VITA NP BOND

Reliable adhesion ensures long-term success
VITA NP BOND acts as a buffer, balancing out the different levels of CTE-related stress at the layer interfacing between both materials. The result: a stable bond between the substructure and ceramic that provides a reliable basis for the long-term success of the restoration.

Simple processing

VITA NP BOND is available as a ready-to-use paste, which does not need to be mixed before it is applied. Moreover consistent processing and firing characteristics help to avoid errors during use and save time.

Beautiful golden hue for greater shade fidelity

The color adjustment of VITA NP°BOND not only lends a warm basic hue, it also improves the shade fidelity of the veneer and hence optimizes the esthetic appearance of the restoration. Conditioning the framework using VITA NP°BOND means that firing with WASH OPAQUE is no longer required.

Usage not limited to a particular manufacturer

VITA NP BOND is suitable for all precious metal-free alloys regardless whether they are casting, CAD/CAM or laser-sintered alloys. The new NP bonder is recommended for perfect veneering of all CoCr substructures. 

* CTE = Coefficient of thermal expansion, describes how the size of an object changes with a change in temperature.

Vahle Buchheimer VITA Zahnfabrik

Interview

The VITA LAB News editorial office wanted to know more about it and asked Annika Vahle, B. Sc. Dental Technology, who is responsible for VITA NP Bond in VITA's Research and Development Department and Andreas Buchheimer, head of VITA's Application Technology Department, about the new bonder.

What has led to the development of NP BOND?

Annika Vahle: The growing variety of alloys. Above all, milling alloys may contain alloy components which ensure improved milling properties but may result in a non-linear course of the CTE curve. If the non-linear course is found in the range of the glass transition temperature of the ceramic, cracks may occur . The large number of bonders of other manufacturers proves that this does not only apply to VITA's veneering ceramics.

Why do you rely on a NP bonder? Couldn't a wash opaque be used for this task as well?

Annika Vahle: Thanks to special admixtures, such as special metal oxides, an improved buffer effect between metal and ceramic is achieved as compared to when using a normal wash opaque. Improved wetting is ensured already at low firing temperatures by adding low-melting components.

Is the indication of a bond strength value essential for the result?

Annika Vahle: From VITA's point of view, achieving a high bond strength value is not only essential for sustained stable bonding of materials, we think that a thermal stability test is much closer to the practice. In this test, crowns and bridges are subjected to severe temperature fluctuations and subsequently checked for cracks.

How is the substructure prepared for the application of VITA NP BOND?

Andreas Buchheimer: We recommend to strictly adhere to the alloy manufacturer's instructions during the preparation of the substructure, that is during finishing, sandblasting and cleaning. After cleaning, you should no longer touch the metal surface.

What needs to be observed during the first use?

Andreas Buchheimer: Before using for the first time, mix VITA NP BOND Paste thoroughly using a spatula. If the paste has dried out, you can mix it to its original consistency again using VITA PASTE FLUID. Other liquids are not suitable for this purpose.

What do you recommend when applying and firing the NP bonder?

Andreas Buchheimer: Apply an opaque layer of VITA NP BOND to the substructure – similar to a washbake - using a brush or glass instrument (fig. 1 and 2). Then perform firing at 960°C. VITA furnaces include a special program for this firing process (fig. 3). By the way, a wasbake is no longer required after using VITA NP BOND.

After bonder firing (fig. 4), apply the opaque in the usual way and perform ceramic firing. Thanks to the improved surface structure after bonder firing, easier, improved and more uniform application of the opaque is enabled. 

 

Fig. 1 VITA NP BOND Paste is available in a 5 g jar and ready to use.

Abb. 2 An opaque layer of VITA NP BOND is applied to the substructure (similar to wash opaque).

Fig. 3 Perfect firing results are achieved with VITA ceramic furnaces which feature a special firing program for VITA NP BOND.

Fig. 4 Enhanced esthetic appearance: after firing with VITA NP BOND, the substructure exhibits a warm golden basic hue.

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