Rigid-Soft Resin Guide Plate for Precise Undercut Restoration
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Solution Overview
Problem
Existing 3D printing guide plates for flowable composite resin injection face challenges such as difficulty in placement and displacement, poor molding precision, excessive resin overflow, and high production costs, especially for teeth with undercuts.
Innovation Solution
A guide plate structure combining a rigid guide plate shell and a soft lining, featuring injection channels, overflow holes, termination points, and a manufacturing method that includes 3D printing the shell and impression molding the lining, using a transparent silicone rubber material for the soft lining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigid guide plate is used, then the guide plate can be manufactured with high precision through 3D printing, but the guide plate is difficult to be removed after being put into an undercut of teeth, resulting in difficult displacement after resins are cured
Solution Approach 1:
The guide plate is divided into a rigid guide plate shell and a soft lining that can be separately manufactured and then combined. The rigid shell provides precision while the soft lining enables easy removal and displacement from undercut areas after resin curing.
Solution Approach 2:
The guide plate uses a composite structure combining rigid material (guide plate shell) and soft material (lining). This composite design allows the guide plate to maintain high manufacturing precision while achieving easy displacement through the soft lining's flexibility.
2Device complexity
If the guide plate is designed as a single piece, then the structure is simple, but the guide plate is prone to floating and spreading out during injection, resulting in poor molding precision
Solution Approach 1:
The guide plate is segmented into a rigid shell and a soft lining that work together as a unified structure. This segmentation prevents floating and spreading during injection while maintaining structural simplicity, thereby improving molding precision.
3Ease of operation
If a soft guide plate is used, then the guide plate can be easily removed and displaced, but the 3D printing precision is insufficient and production costs are extremely high
Solution Approach 1:
The guide plate is segmented into a rigid shell manufactured through precise 3D printing and a soft lining added subsequently. This allows the rigid shell to achieve high 3D printing precision while the soft lining provides easy displacement capability.
Solution Approach 2:
The guide plate combines rigid and soft materials in a composite structure. The rigid shell is manufactured with high precision through 3D printing, while the soft lining is added to provide ease of removal and displacement, avoiding the need for entirely soft guide plates.
4Area of stationary object
If the guide plate extends to the edge of the tooth, then the molding coverage is complete, but excessive resin overflows from the edge of the guide plate, which is unfavorable for subsequent trimming
Solution Approach 1:
The guide plate design extracts the excess resin through overflow holes positioned at strategic locations. These holes allow excess resin to escape controlledly during injection, preventing unwanted overflow from the edges and facilitating easier trimming.
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
Improves molding precision, reduces resin overflow, and lowers production costs, enabling accurate restoration of dental defects with various shapes and sizes, especially for teeth with undercuts.
Implementation Method 1
The lining is a soft lining, and the lining is elastic and capable of producing certain deformation
Data Source
AI summary
The present discloses a guide plate structure for injecting a flowable composite resin. The guide plate structure includes a rigid guide plate shell and a soft lining, a plurality of overflow holes are formed on the guide plate shell. The guide plate shell is provided with an injection channel used for injecting a flowable composite resin. A method for manufacturing a guide plate structure for injecting a flowable composite resin is further disclosed, including: S1, manufacturing a wax pattern model; S2, manufacturing a guide plate shell; S3, manufacturing a lining; S4, correcting an edge of the guide plate shell; and S5, cleaning a soft material in an injection channel on the guide plate shell. The present disclosure can resolve the problem of difficulties in placement and displacement of a guide plate when a resin is injected to restore an undercut of a tooth, and improve molding precision of the restoration.