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The acid-base resistant zone in three dentin bonding systems.

Go Inoue¹, Toru Nikaido, Richard M Foxton

¹Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8549, Japan. inoue.ope@tmd.ac.jp

Dental Materials Journal

|December 19, 2009

Summary

Self-etching dental bonding systems create an acid-base resistant zone next to the hybrid layer. This zone was not clearly observed with wet bonding systems, indicating differences in dentin surface interaction.

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Area of Science:

Dental Materials Science
Biomaterials Engineering
Adhesive Dentistry

Background:

The hybrid layer is crucial for dental restorations, but its long-term stability under oral conditions is a concern.
An acid-base resistant zone adjacent to the hybrid layer has been observed, potentially enhancing restoration durability.
Understanding how different bonding systems influence this zone is vital for improving clinical longevity.

Purpose of the Study:

To investigate the presence and characteristics of the acid-base resistant zone using three distinct dental bonding systems.
To compare the effectiveness of self-etching primer systems versus a wet bonding system in forming this protective zone.
To elucidate the role of dentin etching and bonding agent interaction in acid-base resistance.

Main Methods:

Dentin disks were bonded with three different dental bonding systems (one-step self-etching, two-step self-etching, and wet bonding).
Resin composite was applied, and specimens were subjected to an acid-base challenge.
Scanning Electron Microscopy (SEM) was used to examine the polished surfaces for the presence of an acid-base resistant zone.

Main Results:

A distinct acid-base resistant zone was clearly observed adjacent to the hybrid layer with both one- and two-step self-etching primer systems.
The appearance of the acid-base resistant zone differed between the two self-etching systems.
The presence of an acid-base resistant zone was unclear when the wet bonding system was used.

Conclusions:

Self-etching primer systems effectively create an acid-base resistant zone, likely due to mild dentin etching and interaction with the bonding agent.
The wet bonding system did not consistently form a discernible acid-base resistant zone.
The findings suggest that self-etching systems may offer superior protection against acid challenges at the hybrid layer interface.