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HOT TOPIC: If You’re Not Using Gen-8 Adhesives, You Should Be!

Categories: Restorative Dentistry

Author(s): Robert D. Marus, DDS, AAACD

Date: 07-15-2020 08:04:26 am

The benefits of using 8th-generation universal ahesives are both numerous and indisputable. So, why are so many of us still clinging to older,less reliable, more technique-sensitive systems. Inertia? Familiarity? Fear of change?

The hesitancy among some colleagues to investigate these adhesives is puzzling to me. I have been using   one for about 3 years, and it is absolutely the most user-friendly bonding agent that I have used in my 30 years of clinical practice. I am urging all my colleagues  to simply try one of the many universal systems of the market, and here, I’ll explain why.

These adhesives are based on proven chemistry from previous formulations, with the added advantage of the MDP monomer. This functional, hydrophilic monomer, which has mild etching properties, enables these universal adhesives to be used in all modes: total-, selective-, and self-etch. Even with self-etch techniques, you get 30 MPa bond strength to enamel.

Many of us, including myself, feel more comfortable etching enamel in the selective-etch technique. With an 8th-generation adhesive, if you inadvertently etch dentin, you are still fail-safe. With a conventional
self-etch, this would compromise bond strength. Additionally, universals are typically HEMA-free, which also ensures strong, durable dentin bonding.
 

“THESE ADHESIVES ARE BASED ON A PROVEN CHEMISTRY FROM PREVIOUS FORMULATIONS, WITH THE ADDED ADVANTAGE OF THE MDP MONOMER.”

Another interesting side note: I was recently introduced  to the “super dentin” concept. A team of Japanese researchers found that unetched surfaces combine
with the adjacent hybrid layer—enabled by the MDP monomer—to develop an acid-base resistance zone that significantly reduces the risk of recurrent or secondary caries. This is especially beneficial  when  you  selective- etch on a Class V or on the floor of a Class II proximal box.
 
Simplify and Streamline
So, there truly is no reason NOT to be using an 8th-generation universal adhesive. Chances are, your preferred material manufacturer has one. While there are slight differences between the systems, universal adhesives are compatible with all etching modes and with any clinical situation, so you can simplify procedures, streamline product inventory, and reduce waste—most of them have a two-year shelf life. Try it. You’ll like it.
 
When using previous-generation adhesives, you have to be very careful not to over-dry dentin and not to leave it too moist. Doing so would not only impact bond strength, but it can also create a scenario of sensitivity. Loaded with more photoinitiator, universals offer quick application and short curing time, so they eliminate adhesive-related sensitivity.
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