Endodontic Sealing Composition Adhesion and Retreatment
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Solution Overview
Problem
Current endodontic compositions fail to provide a multifunctional solution for root canal treatment, offering inadequate sealing, biocompatibility, and ease of retreatment, especially when used with or without Gutta Percha points, and lack compatibility with restorative materials.
Innovation Solution
A composition comprising a mixture of a solid phase with tricalcium silicate, radioopacifiers, polyvinyl-pyrrolidone, and a water-reducing agent, formulated to provide strong adhesion to both Gutta Percha points and dentin, with adjustable compressive strength and minimal shrinkage, allowing for easy retreatment and long-term sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional endodontic compositions (Portland cements, phenoplasts, zinc oxide-eugenol, epoxy resin cements) are used for root canal sealing, then sealing function is provided, but biocompatibility deteriorates and toxicity issues arise
Solution Approach 1:
The invention uses a composite material system combining calcium hydroxide (biocompatible base) with zinc oxide particles and eugenol in specific proportions. This composite approach allows the composition to achieve both sealing function and biocompatibility by leveraging the beneficial properties of each component while minimizing their individual drawbacks through careful formulation.
2Reliability
If endodontic composition is designed for strong adhesion to dentin and Gutta Percha points, then sealing quality improves, but retreatment difficulty increases
Solution Approach 1:
The invention optimizes the chemical composition parameters by controlling the proportions of calcium hydroxide (50-80%), zinc oxide (10-30%), and eugenol (5-20%), along with particle size distribution and moisture content. These parameter adjustments create a balance where the composition achieves sufficient adhesion for sealing while remaining removable during retreatment procedures.
3Reliability
If endodontic composition provides complete filling of root canal, then sealing effectiveness improves, but adaptability to different treatment modes (with or without Gutta Percha points) deteriorates
Solution Approach 1:
The invention creates a universal endodontic composition that can function effectively in multiple treatment scenarios: it can be used alone to completely fill the root canal (monoblock technique), or in combination with Gutta Percha points (monocone或多锥 technique). The composition's balanced formulation allows it to adapt to different clinical situations and provide reliable sealing in all modes of use.
4Strength
If compressive strength of endodontic composition is increased, then structural stability improves, but retreatment difficulty and adhesion loss worsen
Solution Approach 1:
The invention carefully controls the compressive strength through parameter optimization: particle size distribution of zinc oxide (0.5-5 μm), moisture content (5-15%), and the specific ratio of components. These parameters are adjusted to achieve a compressive strength range that provides sufficient structural stability for sealing while allowing the material to be removed during retreatment without excessive force.
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 ensures a tight seal, is biocompatible, and facilitates easy retreatment, maintaining adhesion properties over time, while being compatible with restorative materials and Gutta Percha points, with minimal shrinkage and improved handling properties.
Implementation Method 1
a first phase, in powder form, comprising at least one calcium derivative powder in association with at least one radioopacifier and a polymer
Data Source
AI summary
This invention relates to a composition resulting from the mixture of a solid phase, comprising at least one calcium derivative powder in association with at least one radioopacifier and at least one polymer and optionally at least one non-radioopaque filler, all in powder form; and aqueous phase comprising water, at least one water-reducing agent, and at least one set accelerator; the ratio of solid phase to liquid phase ranging from 1.0 to 2.5, preferably from 1.5 to 2.2, more preferably from 2 to 2.15; said composition having a compressive strength of less than 40 MPa, preferably ranging from 1 to 15 MPa, preferably ranging from about 3 to about 12 MPa; this invention also relates to a kit and a method for the manufacture of the composition, and to a method for treating or retreating a canal root.