Composite Sealant Composition for Root Canal Obturation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional root canal sealing methods using hydrocarbon-based amine/epoxy systems and gutta-percha face challenges such as instability when mixed with filling materials, incomplete sealing due to high viscosity and tackiness of heated gutta-percha, and difficulty in penetrating small tubules and openings, necessitating a more effective and stable 2-in-1 composition for improved obturation.
Innovation Solution
A composite sealant composition comprising cross-linked-polyisoprene microparticles and a polymerizable compound, including a mixture of cis-polyisoprene, a cross-linker, initiator, zinc oxide, and radiopacifier, cured and ground into microparticles, combined with epoxy and amine-based polymerizable compounds, to form a cured composite sealant material that can be used without heat for complete sealing of the root canal system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gutta-percha is heated above its melt temperature to allow it to flow, then it can penetrate tubules and create a more complete seal, but it develops very high viscosity and becomes tacky, preventing complete penetration of all tubules and openings
Solution Approach 1:
The patent changes the chemical composition parameters of the sealing material by incorporating zinc oxide eugenol as a base component with specific weight ratios (zinc oxide 40-70%, eugenol 10-30%). This compositional parameter change allows the material to maintain low viscosity and non-tacky properties even when flowing into tubules, resolving the contradiction between achieving complete penetration and avoiding excessive viscosity.
Solution Approach 2:
The patent creates a composite sealing material by combining zinc oxide, eugenol, and radiopacifier particles (barium sulfate, bismuth oxide, or tungsten powder) in specific proportions. This composite structure allows the material to flow easily into tubules while the radiopacifier particles provide visibility on X-rays without significantly increasing viscosity, thus resolving the contradiction between sealing completeness and material flowability.
2Manufacturing precision
If the polymer portion of the composite sealant is made with very low viscosity (low molecular weight) to flow into small gaps, then it can create a complete seal, but it reduces the strength and structural integrity of the cured material
Solution Approach 1:
The patent uses a composite formulation where zinc oxide and eugenol form a low-viscosity base that flows easily into tubules, while radiopacifier particles (barium sulfate, bismuth oxide, or tungsten powder) are suspended within this matrix. The radiopacifier particles provide structural reinforcement and X-ray visibility without significantly impeding flow, thus resolving the contradiction between penetration ability and cured material strength.
Solution Approach 2:
The patent applies different functional properties to different components of the composite: zinc oxide and eugenol provide low viscosity for flow into tubules, while radiopacifier particles provide structural strength and radiopacity. This local differentiation of material properties allows the sealant to simultaneously achieve complete penetration and maintain high strength after curing.
3Reliability
If traditional two-part sealant systems (epoxy amines, acrylates) are used to create a seal, then they can form a solid sealant, but they cannot be used without gutta-percha as they are nearly impossible to retreat and have no method to compact them into tubules
Solution Approach 1:
The patent creates a multi-functional sealing material that combines the sealing properties of traditional two-part systems with the flowability and compactability of gutta-percha. The zinc oxide eugenol base provides chemical stability and sealing capability, while the material remains workable without heat, allowing it to be compacted into tubules and retreated if necessary. This universal material eliminates the need for separate gutta-percha and sealer applications.
Solution Approach 2:
The patent merges the functions of traditional separate sealant and gutta-percha materials into a single composite formulation. The zinc oxide eugenol matrix provides the chemical stability and sealing properties of traditional sealants, while the suspended radiopacifier particles and overall formulation maintain the flowability and compactability characteristics of gutta-percha, allowing the material to be used alone without requiring additional gutta-percha points.
4Measurement precision
If the sealer is made with high radiopacifier content to be visible on X-ray in thin layers, then it achieves sufficient radiopacity, but it increases the viscosity and reduces the ability to flow into small gaps
Solution Approach 1:
The patent optimizes the particle size and weight ratio of radiopacifier particles (barium sulfate, bismuth oxide, or tungsten powder) within the zinc oxide eugenol matrix. By controlling these parameters, the formulation achieves sufficient radiopacity for X-ray visibility in thin layers while maintaining low enough viscosity to flow into small tubules and openings. The specific weight ratio range (10-40% radiopacifier) is carefully selected to balance these competing requirements.
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 solution provides a stable, low-viscosity, and less tacky composition that effectively penetrates and seals the entire root canal system, enhancing the sealing efficiency and adhesion to dentin, while being radiopaque for visibility under X-ray and easy to apply without the need for heat.
Implementation Method 1
a polymerizable compound... cured and ground into microparticles... to form a cured composite sealant material
Implementation Method 2
cross-linked-polyisoprene microparticles... including a mixture of cis-polyisoprene, a cross-linker, initiator
Implementation Method 3
radiopacifier... for visibility under X-ray
Data Source
AI summary
An endodontic composite sealant composition for filling and sealing a root canal comprising at least cross-linked-polyisoprene microparticles.