Bundle of Reinforcement Pins for Dental Restoration Canal Perforation
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Solution Overview
Problem
Current crown and root tooth restoration methods face challenges in strengthening both the crown and root parts while minimizing the risk of weakening or perforation of the canal walls, especially during subsequent access operations, due to the irregular shape of root canals and the difficulty in etching composite resin restorations.
Innovation Solution
A reinforcement structure comprising a bundle of flexible pins with a distinct etching canal pin made from a material that is easier to etch, surrounded by the pins, which are secured together by a joining means to form a cohesive bundle that guides the drill bit during etching, reducing the risk of perforation and facilitating access to the apical areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a post is inserted and sealed in the root canal to act as retention for a crown restoration, then the retention strength is improved, but the risk of weakening or perforation of the canal walls increases
Solution Approach 1:
The reinforcement structure is divided into multiple separate pins (typically 3-6 pins) arranged in a bundle, rather than using a single solid post. This segmentation allows the pins to be distributed throughout the canal cross-section, providing retention strength while leaving spaces between them that reduce the risk of concentrated stress on canal walls and facilitate safer insertion and removal procedures.
2Manufacturing precision
If the root canal is enlarged and rectified to fit a post, then the post fit is improved, but the strength of the canal wall is diminished
Solution Approach 1:
Instead of uniformly enlarging the entire root canal to accommodate a post, the invention uses multiple discrete pins placed at specific locations within the canal. This local approach provides precise fit where needed (at pin insertion points) while preserving the natural canal wall structure in between, maintaining overall canal wall strength.
3Strength
If a rigid post structure is used to strengthen the restoration, then the mechanical strength is improved, but the ease of subsequent access operations is reduced
Solution Approach 1:
The bundle of separate pins can be individually accessed and removed through the restoration if subsequent access operations are needed. This segmentation provides mechanical strength during normal function while allowing flexible access to the root canal system when clinically required, unlike a solid post that would require extensive drilling to access.
4Ease of manufacture
If the canal is prepared with a circular shape to accommodate conventional posts, then the post insertion is simplified, but the contact areas with irregular canal walls are reduced
Solution Approach 1:
The multiple pins in the bundle are positioned to contact different regions of the irregular canal cross-section, with each pin providing localized contact and adhesion. This approach adapts to the natural irregular shape of the canal, maximizing contact areas and stress transmission without requiring the canal to be reshaped into a circular form.
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 proposed solution enhances the mechanical strength of the crown and root restoration while reducing the risk of canal wall perforation by providing a controlled etching direction and easier access to infected areas, maintaining the structural integrity of the tooth canal.
Implementation Method 1
an additional pin made from a material that is etched more quickly than the plurality of reinforcement pins so as to form an etching canal
Implementation Method 2
a joining means configured to group the plurality of reinforcement pins and the additional pin together so as to form a bundle of pins
Data Source
AI summary
A reinforcement structure for a crown and root tooth restoration includes: a plurality of reinforcement pins having diameters ranging from 0.1 mm to 0.5 mm, an etching canal facilitating access to an infected apex, in the crown and root restoration, a joining element configured to group the plurality of reinforcement pins together so as to form a bundle of pins, the joining element partially covering the length of the reinforcement pins.