Root Canal Hydrogel Scaffold for Vital Pulp Regeneration
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Solution Overview
Problem
Current root canal treatments using gutta-percha and other fillers fail to regenerate vital tooth pulp, leading to bacterial reinfection and the need for retreatment or extraction due to lack of regenerative capacity and immunological response, especially in adults.
Innovation Solution
Implantation of a hydrogel scaffold with or without a sponge scaffold, containing chemotactic, angiogenic, and immunomodulatory biofactors, to promote the infiltration of endogenous cells and regenerate vital tooth tissue, including nerve and vascular tissues, within the root canal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gutta-percha filler is used in root canal treatment, then the canal is filled and sealed, but the tooth pulp cannot regenerate and bacterial reinfection occurs
Solution Approach 1:
The patent changes the material parameter from inert gutta-percha to a bioactive hydrogel composition containing gelatin, heparin, and growth factors. This parameter change enables the filling material to actively participate in tissue regeneration and immune response, transforming it from a passive barrier to an active regenerative agent that prevents bacterial reinfection while promoting pulp vitality.
Solution Approach 2:
The patent employs a composite hydrogel material combining multiple components: gelatin matrix, heparin, and various growth factors (VEGF, FGF, PDGF, TGF-beta). This composite formulation provides both structural filling function and biological activity, enabling simultaneous canal obturation and pulp regeneration, thereby eliminating the harmful effect of bacterial reinfection while maintaining treatment success.
2Ease of manufacture
If conventional fillers are used, then the canal is obturated, but the tooth loses vital tissue and regenerative capacity
Solution Approach 1:
The hydrogel filling material is designed to be self-regenerative, containing growth factors that automatically stimulate pulp cell proliferation and tissue formation. The material serves both as a filling agent and a biological stimulus, eliminating the need for separate regenerative procedures and maintaining pulp vitality without complicating the treatment protocol.
Solution Approach 2:
The patent transforms the filling material from a static, non-biological substance to a dynamic, bioactive hydrogel that maintains pulp vitality. By changing the material's chemical and biological parameters, the procedure achieves both ease of manufacture and preservation of tooth pulp stability, resolving the contradiction between procedural simplicity and tissue vitality maintenance.
3Reliability
If gutta-percha is used, then the canal is filled with inert material, but the tooth cannot mount an immunological response
Solution Approach 1:
The hydrogel acts as an intermediary that bridges the gap between the filling material and the tooth's immune system. By incorporating growth factors and bioactive molecules, the hydrogel mediates communication between the filling and the tooth's defensive mechanisms, enabling the tooth to mount an active immunological response against bacteria while maintaining reliable infection prevention.
4Ease of repair
If retreatment is performed after failure, then infection is removed, but the tooth often requires extraction anyway
Solution Approach 1:
The patent applies preliminary action by incorporating growth factors and bioactive molecules into the initial filling material, creating a regenerative environment from the start. This preliminary biological preparation prevents infection and maintains pulp vitality, eliminating the need for subsequent retreatment and extraction, thereby improving long-term reliability while maintaining ease of initial treatment.
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
Regenerates living tissue in the root canal, restoring nerve sensation and vascularity, preventing bacterial infiltration, and reducing the need for retreatment and extraction, thereby saving teeth and minimizing treatment costs.
Implementation Method 1
containing chemotactic, angiogenic, and immunomodulatory biofactors, to promote the infiltration of endogenous cells
Implementation Method 2
containing chemotactic, angiogenic, and immunomodulatory biofactors
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
Methods of regenerating vital tooth tissue in situ after endodontic therapy include introducing a hydrogel scaffold into a root canal of a tooth in a patient after native pulp has been removed from the root canal. The hydrogel scaffold may comprise a sponge scaffold, and can be acellular. The hydrogel scaffold can contain chemotactic, angiogenic, neurogenic, and/or immunomodulatory biofactors that cause infiltration of endogenous cells from the patient into the root canal. Alternatively, such biofactors/drugs can be administered to the patient separately from the hydrogel scaffold. The hydrogel scaffold can fill the periapical space of an abscessed root.