Dental Cement Water Control Humid Curing

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Solution Overview

Problem

Dental cements exhibit low curability under humid conditions and insufficient flexural strength, which are limitations in dental applications.

Innovation Solution

A dental cement composition comprising a first agent with an organic peroxide and (meth)acrylate, and a second agent with a thiourea derivative, ascorbate, vanadium compound, and (meth)acrylate, with controlled water content to enhance curability and flexural strength, including fillers and additives for improved properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional dental cement formulations are used, then the material can be applied in dental procedures, but curability under humid conditions deteriorates

Engineering Contradiction:

Improvecurability under humid conditionsVSAvoidhumid environment interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the chemical composition parameters by incorporating specific ratios of (meth)acrylate monomers, organic peroxides, thiourea derivatives, and vanadium compounds. This compositional parameter change enables the cement to cure effectively under humid conditions by creating a polymerization system that is insensitive to water interference.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining organic peroxide initiators with thiourea-vanadium catalyst complexes. This composite approach integrates multiple functional components that work synergistically to achieve reliable curing in humid environments, where single-component systems would fail.

Inventive Principle:

Principle #40Composite materials

2Strength

If conventional dental cement formulations are used, then the material can be applied in dental procedures, but flexural strength deteriorates

Engineering Contradiction:

Improveflexural strengthVSAvoidformulation complexity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent optimizes the concentration parameters of key components, specifically maintaining organic peroxide at 0.1-5 mass%, thiourea derivative at 0.1-5 mass%, and vanadium compound at 0.01-1 mass%. These parameter optimizations achieve high flexural strength (≥100 MPa) while keeping the formulation practical for manufacturing.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops a composite polymer matrix combining poly((meth)acrylate) chains crosslinked through peroxide-initiated polymerization. This composite structure, enhanced with filler particles, provides the necessary flexural strength while maintaining manufacturability through established dental material processing techniques.

Inventive Principle:

Principle #40Composite materials

3Ease of operation

If water content is increased in the dental cement, then workability may improve, but flexural strength of the cured product deteriorates

Engineering Contradiction:

ImproveworkabilityVSAvoidflexural strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The patent strictly controls the water content parameter, limiting it to ≤1 mass% in the final formulation. This parameter control prevents water from interfering with the polymerization reaction and ensures high flexural strength, while the (meth)acrylate monomers provide sufficient workability without requiring additional water.

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 dental cement demonstrates improved curability under humid conditions and desirable flexural strength, maintaining stability and adhesiveness to dental materials, as shown in the examples.

Implementation Method 1

a first agent including an organic peroxide and a (meth)acrylate

Methodology Applied

Scientific EffectPeroxide decomposition: Decomposition (biological)

Implementation Method 2

a first agent including an organic peroxide and a (meth)acrylate; and a second agent including a thiourea derivative, an ascorbate, a vanadium compound, and a (meth)acrylate

Methodology Applied

Scientific EffectFree radical polymerization: Photopolymerisation

Implementation Method 3

a second agent including a thiourea derivative, an ascorbate, a vanadium compound, and a (meth)acrylate

Methodology Applied

Scientific EffectReduction: Reduction

Implementation Method 4

a second agent including a thiourea derivative, an ascorbate, a vanadium compound, and a (meth)acrylate

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentEP3342393B1Dental cement

Publication Date: 2023.11.29 GC CORP

AI summary

An aspect of the present invention relates to a dental cement that includes a first agent including an organic peroxide and a (meth)acrylate; and a second agent including a thiourea derivative, an ascorbate, a vanadium compound, and a (meth)acrylate, where the first agent and the second agent each have a water content that is less than or equal to 1 mass%.