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Inside Dentistry
March 2014
Volume 10, Issue 3


Improved chemistry for superior bonding in all procedures

Shamshudin Kherani, DDS, FAGD

Dental bonding agents (adhesives) have been rapidly evolving since the 1950s. Improving adhesive “durability” requires adhesives that improve on water permeability, chemical and mechanical interaction, and the physical properties of the adhesive, as well as provide a stable shelf life with simple, predictable dispensing.1

With this in mind, the novel incorporation of “cross-linking monomers” in some bonding agents is allowing manufacturers to significantly improve current adhesives and has led to the creation of a “dream adhesive.”2 This evolution has led to the creation of ALL-BOND UNIVERSAL (BISCO, Inc.).

Being hydrophilic on application but hydrophobic on polymerization allows it to be chemically stable, protect collagen fibers, provide sufficient wetting of dentin, and lead to quickly polymerizing hydrophobic barriers to water penetration. The use of highly hydrophobic monomers made it possible to design a single-component adhesive without the concerns of it being hydrophilic and permeable, minimizing degradation of the bond.

Chemically speaking, the higher the partition coefficient (logP value), the more hydrophobic the adhesive functional monomer and other resins used in dental adhesives will be. The logP value is 5.1 for Bis-GMA and 4.0 for MDP, whereas the logP values of 4-MET and HEMA are 1.7 and 0.26, respectively. MDP, therefore, is the favored functional adhesive monomer used in ALL-BOND UNIVERSAL. The nano-layering of the MDP-Ca salt formation may be responsible for the good long-term performance3 of MDP-containing adhesives, both in vivo and in vitro.4

A significant added bonus is the strong chemical bond to metals and zirconia, and a significant bond to etched porcelain and lithium disilicate. The bond to porcelain can be further enhanced by using silane as a coupling agent.

Finally, the pH of the ALL-BOND UNIVERSAL is 3.2, which does not interfere with the chemical reaction of the self-cure luting resins that may be used in conjunction with the adhesive.

In my opinion, if you have to use one universal enamel and dentin bonding agent, your choice should be ALL-BOND UNIVERSAL, making sure that you selectively etch enamel with 32% phosphoric acid.


1. Scarrett DC. Clinical challenges and the relevance of materials testing for posterior composite restorations. Dent Mater. 2005;21(1):9-20.

2. Suh BI, Chen L, Brown DJ. A novel concept: the introduction of cross linking monomers into a self-etch adhesive to create a more hydrophobic and durable bond. Oral Health. 2011;March:62-66,94.

3. Loguercio AD, Moura SK, Pellizzaro A, et al. Durability of enamel bonding using two-step self-etch systems on ground and unground enamel. Oper Dent. 2008;33(1):79-88.

4. Yoshida Y, Yoshihara K, Nagaoka N. et al. Self-assembled nano-layering at the adhesive interface. J. Dent Res. 2012;91(4):376-381.

About the Author

Shamshudin Kherani, DDS, FAGD, has served as the president of the IACA, and vice president, educational advancement at LVI. He teaches dentists from all over the world in the latest treatments for cosmetic dentistry, adhesive dentistry, full-mouth reconstruction, and neuromuscular occlusion. Dr. Kherani is also in private practice in North Vancouver, Canada.

For more information, contact:


key takeaways

• Perfect chemical balance and flexibility for total-, self-, and selective-etch procedures from
one bottle

• Compatible with all dual-cured and self-cured composite core build-ups and resin cements, making it an ideal product for all bonding procedures

• Clinical evaluation confirms the ease of use as a benefit, leading to virtually no post-operative sensitivity

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