Elastomeric Polyurethane Sealer Composition for Irregular Root Canals
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Solution Overview
Problem
Existing endodontic treatments face challenges in effectively filling complex and irregular tooth root canal spaces due to the instability of isocyanate groups under moisture, leading to decomposition and pH changes, and conventional materials fail to maintain biocompatibility and control CO2 release.
Innovation Solution
A biocompatible elastomeric polyurethane sealer composition is developed, incorporating a polyol part with catalysts and modified nanoparticles, which controls CO2 release and expands to fill irregular canals, using isocyanate chemistry to cross-link and form a stable, pH-neutral polymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If isocyanate groups are used in the filling composition, then expansion and filling capability is improved, but stability under moisture is worsened leading to decomposition and pH changes
Solution Approach 1:
The patent converts the harmful decomposition of isocyanate groups under moisture into a beneficial controlled expansion mechanism. The isocyanate groups are intentionally allowed to decompose and react with water to produce CO2, but this reaction is controlled through catalyst selection and composition formulation to achieve desired expansion while maintaining pH stability through buffer systems.
Solution Approach 2:
The patent changes the chemical parameters of the isocyanate system by selecting specific types of isocyanates and controlling their concentration, along with using catalysts that modulate the reaction rate. This allows control over the timing and extent of decomposition, transforming an unstable property into a controllable expansion process.
2Ease of operation
If conventional filling materials are used, then ease of application is maintained, but biocompatibility and CO2 release control are worsened
Solution Approach 1:
The patent creates a composite filling composition that combines isocyanate-based polymers with biocompatible additives including pH buffers, defoamers, and catalysts. This composite formulation maintains the ease of application of conventional materials while adding controlled CO2 release and pH stability features that improve biocompatibility.
Solution Approach 2:
The patent introduces intermediary substances such as pH buffers and defoamers that mediate between the isocyanate decomposition process and the biological environment. These intermediaries control the pH changes and gas release, protecting surrounding tissues while allowing the expansion function to proceed.
3Volume of moving object
If expansion is increased to fill irregular canals, then filling completeness is improved, but pH disruption and tissue irritation are worsened
Solution Approach 1:
The patent converts the potentially harmful uncontrolled pH changes during expansion into a controlled process by incorporating pH buffers that neutralize extreme pH values. The same decomposition reaction that produces CO2 for expansion also triggers pH changes, but these are immediately buffered to protect surrounding tissues.
Solution Approach 2:
pH buffers act as intermediary substances that intervene between the isocyanate decomposition and the biological environment. They absorb excess H+ or OH- ions generated during the reaction, maintaining pH within a safe range for surrounding tissues while allowing expansion to proceed.
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 stable filling of complex canals with minimal pH disruption, enhanced biocompatibility, and controlled expansion, improving tissue regeneration and mechanical properties.
Implementation Method 1
the polyol part comprises a catalyst... wherein the catalyst comprises at least one of a base catalyst, a metal catalyst, a quaternary ammonium catalyst, a phosphorus-based catalyst
Implementation Method 2
controls CO2 release and expands to fill irregular canals
Implementation Method 3
using isocyanate chemistry to cross-link and form a stable, pH-neutral polymer
Implementation Method 4
A biocompatible elastomeric polyurethane sealer composition is developed
Data Source
AI summary
A composition is provided. The composition comprises a polyol part. The polyol part comprises a catalyst, a defoamer, and modified nanoparticles. The catalyst comprises at least one of a base catalyst, a metal catalyst, a quaternary ammonium catalyst, a phosphorus-based catalyst, or any combination thereof. The composition is an elastomeric polyurethane sealer.