Dental Prosthesis Wave-Like Boundary for Milling Precision
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Solution Overview
Problem
Current methods for manufacturing dental prostheses using PMMA-based materials face challenges in achieving accurate and aesthetically pleasing results, particularly with the attachment of tooth-colored and gum-colored materials, which require complex milling processes and result in high costs and limited accessibility due to the need for precise undercuts and long milling tools, leading to inaccuracies and increased material usage.
Innovation Solution
A dental prosthesis blank is formed with a wave-like boundary between tooth-colored and gum-colored materials, featuring an undulating surface with a radiant shape and increased height in the molar region, allowing for the use of shorter milling tools and enabling accurate production of undercuts, while reducing material costs and milling time, and incorporating an anti-twist device and opaque layer for enhanced aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If long milling tools are used to manufacture dental prostheses, then the ability to create undercuts is improved, but manufacturing precision deteriorates due to flexibility and vibrations
Solution Approach 1:
The invention introduces a tilted boundary surface at a specific angle (15-45 degrees) relative to the horizontal plane, adding a dimensional orientation element to the milling process. This tilted geometry allows short milling tools to access undercut regions by approaching from an angled direction rather than requiring vertically oriented long tools, thereby maintaining precision while achieving the necessary undercut creation capability
2Manufacturing precision
If expensive high-precision milling machines are used, then manufacturing precision is improved, but cost increases
Solution Approach 1:
The invention changes the geometric parameters of the prosthesis design, specifically introducing a tilted boundary surface at a defined angle range (15-45 degrees). This parameter modification allows standard, less expensive milling machines to achieve the required precision for undercuts, eliminating the need for high-precision, costly equipment while maintaining manufacturing accuracy through the optimized angular geometry
3Manufacturing precision
If complex milling processes are used to create gingival lines, then aesthetic quality is improved, but productivity deteriorates
Solution Approach 1:
The invention performs preliminary action by pre-defining the tilted boundary surface geometry at the design stage with a specific angle (15-45 degrees). This pre-planned angular orientation automatically guides the milling process, eliminating the need for complex, time-consuming adjustments during manufacturing to create aesthetically pleasing gingival lines, thereby improving both aesthetic quality and manufacturing efficiency
Data Source
AI summary
A dental prosthesis is provided, manufactured from a one-piece or multi-piece prosthesis blank which is composed of a gum-colored material (14) and a tooth-colored material (14), especially each one being based on plastic material. The tooth-colored material (14) of the blank (10) has a diameter or a width of more than 5 cm and especially a substantially flat cylindrical shape with a diameter/height ratio of more than 2:1, preferably more than 3:1. The gum-colored and tooth-colored materials (14, 12) are bonded together by bonding, polymerization and/or integral production. The boundary (16) between the materials, as viewed in the direction of the dental arch course, is wave-shaped with alternating grooves and ribs (22, 24), and in the region of the anterior arch in the vestibular direction—is of radiant shape.