Resin Modified Glass-Ionomer Cement Bond Strength via Phosphorous Acidity

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Solution Overview

Problem

Conventional resin modified glass-ionomer (RMGI) cements exhibit lower bond strengths to tooth structures compared to self-adhesive and adhesive resin cements, and have limitations in adhesive properties and aesthetics.

Innovation Solution

A dental resin modified glass-ionomer composition incorporating specific phosphorous-containing compounds and bisacrylamides, which enhance acidity and adhesive properties, along with a fluoroaluminosilicate filler and polymerization initiator system, to improve bond strength and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If glass-ionomer cement is used, then adhesive property and mechanical strength are improved compared to zinc phosphate cement, but aesthetics deteriorate due to poor aesthetics and brittleness

Engineering Contradiction:

Improvemechanical strengthVSAvoidaesthetics

Core Design Contradiction:

StrengthVSShape

Solution Approach 1:

The patent combines glass-ionomer cement with resin components to create a composite material that integrates the adhesive properties and mechanical strength of glass-ionomer with the aesthetic properties and fracture resistance of resin, resolving the contradiction between strength and aesthetics

Inventive Principle:

Principle #40Composite materials

2Strength

If self-adhesive and adhesive resin cements are used, then mechanical strength and aesthetics are improved, but adhesive property to tooth structure deteriorates due to hydrophobicity and sensitivity to water/saliva contamination

Engineering Contradiction:

Improvemechanical strengthVSAvoidadhesive property

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent modifies the chemical composition parameters of resin cement by incorporating hydrophilic components and specific functional monomers that change the material's wettability and chemical reactivity, enabling reliable adhesion to tooth structure in the presence of moisture while maintaining mechanical strength

Inventive Principle:

Principle #35Parameter changes

3Strength

If resin modified glass-ionomer (RMGI) cement is used, then mechanical strength is improved over conventional glass-ionomer, but adhesive property to tooth structure deteriorates due to lower bond strength compared to resin cements

Engineering Contradiction:

Improvemechanical strengthVSAvoidbond strength to tooth structure

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent merges the acid-base chemistry of glass-ionomer with the polymerization chemistry of resin, creating a dual-setting system that combines the benefits of both material systems to achieve both high mechanical strength and high bond strength to tooth structure

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If adhesive resin cement is used, then bond strength to tooth structure is improved, but device complexity increases due to complicated bonding protocol requiring separate bonding agent

Engineering Contradiction:

Improvebond strength to tooth structureVSAvoidbonding protocol complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent creates a universal cement material that performs multiple functions simultaneously - providing both the bonding agent function and the cement function in a single material, eliminating the need for separate bonding agent application steps while maintaining excellent bond strength

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 composition demonstrates significantly increased bond strength and improved adhesive properties, addressing the shortcomings of conventional RMGI cements while maintaining stability and aesthetics.

Implementation Method 1

the at least one compound having at least one phosphorous atom provides a strong acidity and has thereby a high effect for dissolving a smear layer of a tooth surface and for tooth decalcification

Methodology Applied

Scientific EffectAcid dissolution:

Implementation Method 2

self-adhesive and adhesive resin cements (5) utilize free-radical polymerization setting reaction of (meth)acrylate monomers

Methodology Applied

Scientific EffectFree-radical polymerization:

Implementation Method 3

Mitra et al. (U.S. Pat. Nos. 5,130,347 and 5,925,715) incorporated a photoinitiator system into a glass-ionomer composition and added polymerizable groups to the polycarboxylic acid through an amide linkage, to make the resulting RMGI composition curable through both an acid-base reaction and a free radical photo-polymerization

Methodology Applied

Scientific EffectPhoto-polymerization: Photopolymerisation

Data Source

PatentUS20230026650A1Dental resin modified glass-ionomer composition and kit comprising said composition

Publication Date: 2023.01.26 DENTSPLY SIRONA INC

AI summary

The present invention is related to a dental resin modified glass-ionomer composition comprising (a) water; (b) at least one polycarboxylic acid; (c) at least one compound having at least one phosphorous atom; and (d) at least one bisacrylamide having formula (I). The present invention is further related to a kit comprising such a dental resin modified glass-ionomer composition.