Wave-Boundary Dental Prosthesis Blank for Stronger Retention
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Solution Overview
Problem
Existing dental prosthesis production methods face challenges in achieving long-term durability and comfort due to issues with material stability, weight, and breakage, particularly at points where metal frameworks terminate, and conventional solutions like hot-polymerization methods are prone to breaking and are costly to produce.
Innovation Solution
A dental prosthesis is produced using a wave-shaped blank with tooth and base materials connected by polymerization along a wave-shaped boundary surface, eliminating the need for a third adhesive layer and incorporating apertures for retainers that provide additional anchoring, allowing for direct chemical bonding and improved strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal frameworks are used to improve stability, then reliability is improved, but weight increases and the prosthesis feels unpleasant to the patient
Solution Approach 1:
The patent changes the material parameters by using high-strength ceramic materials (alumina, zirconia) with optimized grain sizes and compositions to achieve the required mechanical strength without metal, thereby reducing weight while maintaining reliability
Solution Approach 2:
The patent employs composite ceramic structures combining different ceramic materials (e.g., alumina-zirconia composites) to achieve superior mechanical properties that eliminate the need for metal frameworks, providing both stability and weight reduction
2Strength
If hot-polymerisation method is used to provide intimate connection between teeth and prosthesis base, then bonding strength is improved, but the prosthesis tends to break easily and production cost increases
Solution Approach 1:
The patent replaces the hot-polymerisation chemical bonding process with a cold-curing adhesive bonding system that uses specially formulated adhesives with controlled polymerisation characteristics, eliminating the thermal stress that causes breakage while maintaining strong bonding
Solution Approach 2:
The patent changes the bonding parameters by using adhesives with optimized viscosity, curing time, and chemical composition that allow bonding at lower temperatures and stresses, preventing the prosthesis from becoming brittle and prone to breaking
3Reliability
If conventional injection moulding with sliders is used to secure anchoring of teeth, then anchoring is improved, but device complexity and production cost increase
Solution Approach 1:
The patent divides the prosthesis into separate modular components (teeth, prosthesis base, connectors) that can be manufactured independently using simpler injection moulding processes, then assembled with precise anchoring features, reducing the complexity of the moulding tools while maintaining anchoring quality
Solution Approach 2:
The patent incorporates anchoring features directly into the moulded parts during the injection moulding process itself, eliminating the need for complex slider mechanisms and subsequent post-processing operations, thereby simplifying the tooling while ensuring secure anchoring
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
This method results in a prosthesis with enhanced durability and rigidity, reduced material loading, and lower surface pressure, enabling long-term stability and comfort without the need for additional adhesive layers, applicable to various types of prostheses including implant-supported and hybrid designs.
Implementation Method 1
The tooth material and the base material are attached to each other by polymerisation along the boundary surface which is likewise formed in a wave-shaped or scalloped manner
Data Source
AI summary
A method is provided for producing a dental prosthesis from a blank using a CAD/CAM device, wherein the blank consists partially of base material and partially of tooth material, and a boundary surface between these materials is formed as a wave, the wave crests and wave valleys of which alternate with each other along the outer periphery of the blank. The apex of each wave crest extends substantially radially with respect to the blank. The CAD/CAM device fixes the position of a retention part, which serves to fasten the prosthesis to the alveolar crest of a patient, in particular of an external telescope, of a cover of a bar, or of an abutment in the prosthesis in such a way that it passes through the boundary surface. The retention part is fastened by means of gluing or incorporation by polymerisation.