Hydrogel Root Canal Filling Materials for Sealing and Biocompatibility
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Solution Overview
Problem
Current endodontic filling materials, such as calcium hydroxide and mineral trioxide aggregate (MTA), face challenges in handling properties, long hardening times, and susceptibility to coronal leakage and fracture during apexification procedures, necessitating improved biocompatibility and sealing efficacy.
Innovation Solution
Development of single-paste or plural-paste hydrosetting filling materials comprising hydrogel formers and fillers, which form a cohesive and washout-resistant hydrogel matrix upon hydration, providing rapid setting and enhanced sealing properties within the root canal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If calcium hydroxide is used for apexification, then biocompatibility is improved, but handling properties deteriorate and long hardening times occur
Solution Approach 1:
The patent combines calcium hydroxide with other materials (such as bioceramics, glass ionomers, or resin components) to create composite filling materials that maintain the biocompatibility of calcium hydroxide while improving handling properties and reducing hardening time. The composite structure allows each component to contribute its beneficial properties.
Solution Approach 2:
The patent modifies the chemical composition, particle size distribution, or pH levels of calcium hydroxide-based materials to improve their handling characteristics and accelerate setting time while preserving biocompatibility. Parameter optimization allows simultaneous improvement of multiple properties.
2Reliability
If MTA is used for root canal filling, then biocompatibility is improved, but hardening time increases and consistency becomes too dry for injection
Solution Approach 1:
The patent adjusts the water-to-powder ratio, particle size, or chemical composition of MTA to reduce hardening time and improve consistency for injection delivery. Modified MTA formulations maintain biocompatibility while achieving faster setting and better flow characteristics.
Solution Approach 2:
The patent creates composite materials incorporating MTA with other biocompatible materials that accelerate setting time and improve consistency. The composite approach allows MTA's biocompatibility to be preserved while compensating for its slow hardening and dry consistency through additional components.
3Reliability
If calcium hydroxide is used for apexification, then apical closure is achieved, but susceptibility to coronal leakage and fracture increases
Solution Approach 1:
The patent develops composite filling materials that combine calcium hydroxide's ability to induce apical closure with materials that provide enhanced mechanical strength and sealing properties. The composite structure creates a synergistic effect where the calcium hydroxide promotes biological closure while the reinforcing materials prevent fracture and block coronal leakage pathways.
Solution Approach 2:
The patent merges the biological function of calcium hydroxide (inducing apical closure) with the mechanical function of stronger materials (resisting fracture and leakage). This combination allows the filling material to simultaneously achieve soft tissue compatibility and structural integrity.
4Reliability
If conventional filling materials are used, then sealing is provided, but chronic inflammatory responses and bacterial penetration occur
Solution Approach 1:
The patent incorporates antimicrobial agents such as chlorhexidine, iodine compounds, or other oxidizing agents into the filling material to actively kill bacteria and prevent bacterial penetration. These antimicrobial components enhance the sealing capability by eliminating the biological threat that would otherwise compromise the seal.
Solution Approach 2:
The patent creates composite materials that combine sealing components with antimicrobial and anti-inflammatory agents. This multi-functional composite approach provides simultaneous sealing, bacterial elimination, and inflammation reduction, addressing all three harmful factors mentioned in the contradiction.
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 materials demonstrate improved biocompatibility, rapid setting, and superior sealing capabilities, reducing chronic inflammatory responses and bacterial penetration, while maintaining mechanical strength and stability in physiological environments.
Implementation Method 1
single-paste or plural-paste hydrosetting filling materials comprising hydrogel formers and fillers, which form a cohesive and washout-resistant hydrogel matrix upon hydration
Data Source
AI summary
Disclosed are endodontic filling materials and methods. A method for filling a dental root canal may include providing a hydrosetting filling material and inserting the hydrosetting filling material into the dental root canal, the material setting in the root canal to form a biocompatible filling. The hydrosetting filling material comprises a hydrogel former and a filler. The hydrogel former is at least one of a reactive organic hydrogel formers, an inorganic hydrogel formers, and a non-reactive organic hydrogel formers, and the filler is at least one of a self-hardening and a non-hardening filler. Plural filling material precursor compositions that collectively contain hydrogel formers and fillers may be provided.