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Bonding to dentin using an experimental zirconium oxynitrate etchant.

Edoardo Mancuso¹, Allegra Comba¹, Claudia Mazzitelli¹

¹Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna - Alma Mater Studiorum, Via San Vitale 59, 40125, Bologna, Italy.

Journal of Dentistry

|March 24, 2021

Summary

An experimental zirconium oxynitrate etchant (ZON) showed improved long-term bond strength and reduced enzymatic activity compared to traditional phosphoric acid (TE) etchants in dental bonding. This novel etchant offers promising results for hybrid-layer preservation in clinical practice.

Keywords:

Adhesive Dentin etchant Longevity MMP inhibition Zirconium oxynitrate Zymography

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Area of Science:

Dental materials science
Adhesive dentistry
Biomaterials research

Background:

Dental adhesives are crucial for restoring tooth structure.
Long-term durability of dental restorations depends on effective bonding.
Enzymatic degradation can compromise the integrity of the hybrid layer.

Purpose of the Study:

To evaluate the long-term effects of an experimental zirconium oxynitrate etchant (ZON) on bond strength and enzymatic activity.
To compare ZON with a traditional phosphoric acid etchant (TE) when used with simplified adhesive systems.
To assess the impact of aging on microtensile bond strength (μTBS) and nanoleakage (NL).

Main Methods:

Dentin surfaces were conditioned with ZON or TE.
Two simplified adhesives (etch-and-rinse and universal) were applied.
Microtensile bond strength (μTBS), nanoleakage (NL), and enzymatic activity (gelatin and in situ zymography) were assessed at baseline and after 1-year aging.

Main Results:

The universal adhesive (AU) and ZON demonstrated superior μTBS compared to the etch-and-rinse adhesive (EF) and TE, respectively.
Bond strength decreased after 1-year aging for all groups.
ZON groups exhibited significantly lower enzymatic activity and nanoleakage compared to TE groups, particularly after aging.

Conclusions:

The experimental ZON etchant shows potential for preserving the hybrid layer over time when used with simplified bonding systems.
ZON may offer improved long-term stability and reduced degradation compared to traditional etchants.
The findings suggest ZON could be a viable alternative in clinical dental practice.