Denture Base Curable Composition Toughness and Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional one-paste type denture base curable compositions lack satisfactory toughness and control over paste properties, leading to issues with adhesion and storage stability, and often result in low strength and flexibility of the cured bodies.
Innovation Solution
A denture base curable composition comprising a (meth)acrylic monomer, a monomer-absorbing porous organic crosslinked polymer, and a polymerization initiator, with the monomer-absorbing polymer content between 20 to 80 parts by mass and an absorption amount of 1.5 or more, which improves flexural strength, toughness, and paste operability, while limiting non-porous crosslinked polymer content to enhance storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional one-paste type denture base curable compositions are used, then the composition is easy to operate and store, but the cured bodies lack toughness and strength
Solution Approach 1:
The patent uses a composite filler system combining porous organic crosslinked polymer particles (20-80 parts by mass) with non-porous organic crosslinked polymer particles (0-30 parts by mass). The porous particles provide mechanical interlocking and toughness, while the non-porous particles contribute to strength. This composite approach resolves the contradiction by achieving both high toughness and high strength in the cured denture base material while maintaining one-paste ease of operation.
2Strength
If porous organic crosslinked polymer content is increased to improve toughness, then paste viscosity changes and storage stability deteriorates
Solution Approach 1:
The patent optimizes the content parameters of different filler particles to resolve the contradiction. Specifically, it limits porous organic crosslinked polymer particles to 20-80 parts by mass per 100 parts by mass of monomer to ensure toughness, while limiting non-porous organic crosslinked polymer particles to 0-30 parts by mass to maintain storage stability. This precise parameter control allows the paste to maintain stable viscosity during storage while achieving high toughness in the cured state.
3Strength
If non-porous crosslinked polymer is added to improve strength, then paste property control becomes difficult and adhesion decreases
Solution Approach 1:
The patent applies local quality by using two distinct types of filler particles with different functions: porous organic crosslinked polymer particles that provide toughness and adhesion through mechanical interlocking, and non-porous organic crosslinked polymer particles that provide flexural strength. By locally assigning different functions to different filler types and controlling their respective content ranges, the patent maintains good paste property control while achieving high flexural strength.
4Strength
If the composition is formulated for high strength, then paste adhesion to gloves increases causing contamination
Solution Approach 1:
The patent controls the paste's adhesion properties by optimizing the filler composition parameters. The specific ratio and content of porous to non-porous particles, along with the particle size distribution, are tuned to achieve the right balance: enough adhesion to gypsum models and denture bases for proper positioning, but reduced adhesion to gloves to prevent contamination. This parameter optimization allows high strength cured bodies without excessive paste adhesion to gloves.
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 achieves high strength and toughness in the cured bodies with improved paste operability and storage stability, ensuring the paste does not adhere to gloves but adheres to gypsum models or denture bases, maintaining viscosity and adhesion properties over time.
Implementation Method 1
a monomer-absorbing porous organic crosslinked polymer capable of absorbing the (meth)acrylic monomer (A), with an absorption amount RAb, which represents an amount of the (meth)acrylic monomer (A) absorbed per unit amount of the monomer-absorbing porous organic crosslinked polymer (B), of 1.5 or more
Implementation Method 2
a polymerization initiator selected from a photo-polymerization initiator and a thermal polymerization initiator
Implementation Method 3
a polymerization initiator selected from a photo-polymerization initiator and a thermal polymerization initiator
Data Source
AI summary
A curable composition for a denture base is provided which comprises a paste-like composition containing (A) (meth)acrylic monomers, (B) a monomer-absorbing porous organic cross-linked polymer which can absorb the (A) (meth)acrylic monomers, and (C) a polymerization initiator selected from a photopolymerization initiator and a thermal polymerization initiator, wherein the content of (B) the monomer-absorbing porous organic cross-linked polymer is 20-80 parts by mass per 100 parts by mass of the (A) (meth)acrylic monomers, and the absorption amount: RAb={(g−A)/(g−B)}, measured in accordance with JIS K5101-13-1:2004, and defined by the amount of (A) (meth)acrylic monomers: g−A (unit: g) absorbed per unit amount of (B) the monomer-absorbing porous organic cross-linked polymer: g−B (unit: g) is greater than or equal to 1.5.