Powder-Liquid Denture Base Lining Material Surface Curing

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Solution Overview

Problem

Current powder-liquid type denture base lining materials face challenges with surface unpolymerized layers, curability, viscosity increase, and manipulability, leading to issues with surface hardness, colorability, and operational efficiency during denture repair.

Innovation Solution

A powder-liquid type denture base lining material incorporating an organic peroxide, an aromatic amine compound, a pyrimidinetrione derivative, and an organometallic compound, with an extremely small amount of pyrimidinetrione derivative, to achieve diminished surface unpolymerized layers, enhanced curability, and desired viscosity increase.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a chemical polymerization initiator (organic peroxide and aromatic amine compound) is used, then the material exhibits unique viscosity change over time and good manipulability, but a surface unpolymerized layer is formed reducing surface curability

Engineering Contradiction:

ImprovemanipulabilityVSAvoidsurface curability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent combines two polymerization initiation systems: a chemical polymerization initiator (organic peroxide + aromatic amine compound) and a photopolymerization initiator. The chemical initiator provides gradual polymerization and viscosity increase for good manipulability, while the photopolymerization initiator ensures complete surface curing when exposed to light, eliminating the surface unpolymerized layer problem

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention uses a composite initiation system comprising multiple types of initiators (chemical and photopolymerization) working together. This composite approach allows the material to benefit from both the gradual setting characteristic of chemical initiation and the complete surface curing capability of photopolymerization

Inventive Principle:

Principle #40Composite materials

2Shape

If the viscosity increases too high during setting, then the material can maintain shape, but conformity to the mucosal surface cannot be obtained

Engineering Contradiction:

Improveshape stabilityVSAvoidsurface conformity

Core Design Contradiction:

ShapeVSEase of operation

Solution Approach 1:

The patent creates a dynamic viscosity profile through the combined action of chemical and photopolymerization initiators. The chemical initiator provides gradual viscosity increase allowing initial shaping and surface conformity, while photopolymerization provides rapid final setting to lock in the shape. This dynamic control allows the material to transition from flowable to rigid state in a controlled manner

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If polymerization proceeds slowly, then sufficient time is available for shaping and adjustment, but productivity is reduced

Engineering Contradiction:

Improveoperation timeVSAvoidcuring speed

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent employs a two-stage polymerization process: first, chemical polymerization proceeds gradually providing extended operation time for shaping and adjustment; second, photopolymerization is activated to complete the curing process rapidly. This periodic action allows the material to provide both sufficient working time and high final curing speed

Inventive Principle:

Principle #19Periodic action

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 material exhibits improved surface curability, reduced surface unpolymerized layers, and optimal viscosity increase, ensuring better manipulability and operational efficiency during denture repair.

Implementation Method 1

a combination of an organic peroxide and an aromatic amine compound has been widely used as the radical polymerization initiator

Methodology Applied

Scientific EffectChemical polymerization: Chemical Bonding

Implementation Method 2

radicals are generated, and thus, the material has a function in which polymerization and curing proceed

Methodology Applied

Scientific EffectRadical generation: Redox Reactions

Implementation Method 3

Examples of the radical polymerization initiator include a chemical polymerization initiator (normal temperature Redox initiator), a photopolymerization initiator, and a thermal polymerization initiator

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 4

Methodology Applied

Scientific EffectThermal polymerization: Heating

Data Source

PatentUS10973740B2Powder-liquid type denture base lining material

Publication Date: 2021.04.13 TOKUYAMA DENTAL CORP

AI summary

The present invention provides a powder-liquid type denture base liner comprising: a powder material including (A) uncrosslinked resin particles, (B) an organic peroxide, (C) a pyrimidine trione derivative, and (D) an organic metal compound; and a liquid material including (E) a radical polymerizable monomer and (F) an aromatic amine compound, wherein the powder-liquid denture base liner is characterized in that the (C) pyrimidine trione derivative is 0.0002-1.0 mass parts per 100 mass parts of (E) radical polymerizable monomer.