Basic Dental Adhesive Neutralizing Residual Acid

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Solution Overview

Problem

Current dental adhesives are often acidic, leading to residual acid and activation of matrix metalloproteases, which compromise bond durability and compatibility with chemical-cured composites, resulting in poor bonding performance.

Innovation Solution

A light-curable dental adhesive composition with a basic pH, utilizing a polymerizable imidazole resin (IMMA-HEMA) that neutralizes acidic compounds and avoids unwanted reactions with redox initiator systems, ensuring compatibility with both light-cured and chemical-cured resins.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an acidic etchant is used prior to dental adhesive application, then etching effectiveness is improved, but residual acid remains and activates matrix metalloproteases, compromising bond durability

Engineering Contradiction:

Improvebond durabilityVSAvoidresidual acid and MMP activation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful acidic environment into a beneficial basic environment by using a basic adhesive composition (pH 7.5-13.0) that neutralizes residual acid from etching. This transforms the previously harmful residual acid into a neutralized state, eliminating MMP activation while maintaining the benefits of acid etching for bond durability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent fundamentally changes the pH parameter of the adhesive composition from conventional acidic/neutral ranges to a basic range (pH 7.5-13.0). This parameter change allows the adhesive to neutralize residual acid from etching, preventing MMP activation and improving bond durability without compromising etching effectiveness

Inventive Principle:

Principle #35Parameter changes

2Reliability

If acid-containing primer or adhesive systems are used, then bonding to tooth substrates is achieved, but incompatibility with chemical-cured composites occurs due to protonation of amine initiators

Engineering Contradiction:

Improvebonding performanceVSAvoidcompatibility with chemical-cured composites

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Instead of using conventional acidic adhesives that protonate and deactivate amine initiators, the patent inverts the approach by using a basic adhesive composition. This prevents protonation of the amine initiators in chemical-cured composites, allowing dual-cure capability while maintaining bonding performance to tooth substrates

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the pH parameter of the adhesive from acidic to basic (pH 7.5-13.0), which fundamentally alters the chemical interactions with amine initiators. This parameter change prevents unwanted protonation reactions, enabling compatibility with chemical-cured composites while maintaining effective bonding

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The basic dental adhesive composition effectively neutralizes residual acid, enhances bond strength on tooth substrates, and ensures compatibility with both light-cured and chemical-cured resins, providing improved long-term bond performance and compatibility with acidic primers.

Implementation Method 1

the disclosed composition is uniquely basic rather than neutral or acidic for a typical dental adhesive... utilizing a polymerizable imidazole resin (IMMA-HEMA) that neutralizes acidic compounds

Methodology Applied

Scientific EffectAcid-base neutralization: Chemical Bonding