Self-Healing Root Canal Filling Composition for Microcrack Sealing

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Solution Overview

Problem

Conventional root canal filling materials, such as mineral trioxide aggregate (MTA), suffer from microcracks due to shrinkage and leaching, which can lead to bacterial infiltration and inflammation, and contain aluminum components that pose health risks.

Innovation Solution

A dental self-healing root canal filling composition comprising tricalcium silicate, nano-silica, silica fume, or fumed silica, sodium fluoride, lithium carbonate, and radiopaque materials, which provides self-healing capabilities and enhances biocompatibility, mechanical strength, and antimicrobial effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If aluminum-containing cement compositions are used to reduce setting time, then setting speed is improved, but health safety deteriorates due to aluminum ion leaching

Engineering Contradiction:

Improvesetting timeVSAvoidaluminum ion leaching

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent removes aluminum components from the cement composition entirely, replacing them with calcium silicate-based materials. This extraction of the harmful substance eliminates aluminum ion leaching while maintaining the setting functionality through alternative chemical mechanisms involving calcium and silicate reactions.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the chemical composition parameters by substituting aluminum-containing compounds with calcium silicate compounds. This parameter change maintains the setting time characteristic while eliminating the harmful aluminum ion release, achieving both speed and safety requirements.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If MTA is used to provide excellent sealing ability and biocompatibility, then reliability is improved, but mechanical strength deteriorates due to microcrack development

Engineering Contradiction:

Improvesealing abilityVSAvoidmechanical strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent creates a composite material system combining calcium silicate cement with reinforcing agents and adhesion promoters. This composite structure provides both the sealing ability of MTA and enhanced mechanical strength through the synergistic effect of multiple components working together to prevent microcrack formation.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent incorporates preventive measures during material formulation, including adhesion promoters and stress-distributing composite structures, that cushion against microcrack formation before it occurs. This prior protection maintains both sealing integrity and mechanical strength by preventing the initiation of cracks during setting and loading.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Productivity

If rapid setting conditions are implemented during root canal treatment, then productivity is improved, but material durability deteriorates due to microcracks

Engineering Contradiction:

Improvesetting speedVSAvoidmaterial durability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the chemical parameters of the cement composition by using calcium silicate-based materials with controlled hydration kinetics. This parameter change enables rapid setting to match clinical productivity requirements while the modified chemistry prevents microcrack formation that would compromise durability, achieving both speed and long-term reliability.

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 composition effectively seals and repairs microcracks, reduces health risks by eliminating aluminum, and ensures sufficient mechanical strength for clinical use, while maintaining biocompatibility and antimicrobial properties.

Implementation Method 1

a pozzolanic reactant (nano-silica, silica fume, or fumed silica) is added to a tricalcium silicate-based composition

Methodology Applied

Scientific EffectPozzolanic reaction: Chemical Bonding

Implementation Method 2

a calcium solubilization inhibitor... which has a self-healing function of optimizing strength and repairing microcracks

Methodology Applied

Scientific EffectIon inhibition:

Implementation Method 3

a radiopaque material... The composition exhibits desirable physical properties for clinical use, including a compressive strength in the range of 5 to 10 MPa and a flow rate of 25 to 30 mm

Methodology Applied

Scientific EffectX-ray absorption: Absorption (EM radiation)

Data Source

PatentUS20260027015A1Dental self-healing root canal filling composition and method for manufacturing thereof

Publication Date: 2026.01.29 SONG JONG HO

AI summary

Disclosed are dental self-healing root canal filling compositions and methods of preparing the same.The compositions comprise a hardener, a self-healing promoter, a calcium solubilization inhibitor, a bioactive agent, a curing aid, a radiopaque material, a thickener, and purified water.The compositions are capable of minimizing microcracks, improving tissue density, and providing self-healing properties.