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[Electron-probe microanalysis examination of acid-proof dentin layer].

T Fukushima¹, Y Inoue, M Kawaguchi

¹Department of Dental Materials and Devices, Fukuoka Dental College.

Shika Zairyo, Kikai = Journal of the Japanese Society for Dental Materials and Devices

|May 1, 1990

Summary

This study synthesized halogenated methacrylate tracers to predict acid-proof dentin layer thickness. Combining electron-probe microanalyzer (EPMA) with these tracers accurately measured the acid-proof dentin layer at approximately 4 microns.

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Area of Science:

Dental materials science
Polymer chemistry
Analytical chemistry

Context:

Dental bonding agents are crucial for restorative procedures.
Protecting dentin from acid challenges is essential for long-term restoration success.
Developing reliable methods to assess dentin's acid resistance is an ongoing research area.

Purpose:

To synthesize novel halogenated methacrylate monomers for use as tracers.
To evaluate the effectiveness of these tracers in predicting the acid-proof dentin layer thickness.
To combine tracer-based methods with electron-probe microanalyzer (EPMA) for quantitative analysis.

Summary:

Several halogenated methacrylate tracers, including 2-bromoethyl methacrylate (2 BEM), 2-(4-bromophenyl)ethyl methacrylate (BPy1EM), 2-(4-bromo-1-naphthyl)ethyl methacrylate (BNEM), and 2,4,6-tribromophenoxy methacrylate (TriBr-PM), were synthesized.

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These tracers were incorporated into a base monomer, 2-methacryloyloxyethyl hydrogen chloromaleate (CIMEM), for dental bonding agents.

Scanning electron microscopy (SEM) and electron-probe microanalyzer (EPMA) were used to analyze the resin-dentin interface after acid treatment, revealing an approximately 4-micron thick acid-proof dentin layer.

Impact:

The study demonstrates a novel method for predicting and quantifying the acid-proof dentin layer thickness.
This technique enhances the understanding of dentin's interaction with dental materials under acidic conditions.
The findings contribute to the development of more durable and acid-resistant dental restorative materials.