Machining Aid for Angled Dental Prosthesis Cutouts
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Solution Overview
Problem
The production of an angled through passage in dental prostheses is complicated due to limitations in digital machines used by dental prosthesis laboratories, such as lack of axes of freedom, suitable tools, or software constraints, making it difficult to machine the second passage section effectively.
Innovation Solution
A device with a frame and guide means that allows angular pivoting and translation of a milling tool relative to the holding axis, enabling precise machining of an angled through passage in a dental prosthesis blank by limiting the pivoting angle and using elastic return means for ergonomic control, ensuring reliable and easy machining of the second passage section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional CNC machines are used to machine the second passage section, then standard machining operations can be performed, but the ability to produce angled through-passages is limited due to lack of axes of freedom, suitable tools, or software constraints
Solution Approach 1:
The guiding means enable dynamic adjustment of the milling tool orientation through angular pivoting along a pivot axis, allowing the milling axis to assume different angles relative to the holding axis. This dynamic positioning capability resolves the contradiction by providing the adaptability to machine angled passages while maintaining a relatively simple device structure through controlled degrees of freedom.
Solution Approach 2:
The invention introduces an additional rotational dimension by allowing angular pivoting of the milling axis along a pivot axis that is offset from the holding axis. This dimensional addition enables the milling tool to reach angled positions that would be inaccessible to conventional CNC machines with limited axes of freedom, thereby resolving the versatility limitation.
2Adaptability or versatility
If the milling tool is allowed to pivot freely to create angled passages, then adaptability is improved, but control over the pivoting angle becomes difficult to limit between maximum and minimum angles
Solution Approach 1:
The guiding means incorporate predetermined geometric constraints that prevent the milling axis from pivoting beyond specified maximum and minimum angles. These constraints act in advance to limit the range of motion, ensuring that the pivoting angle remains within acceptable boundaries while still allowing sufficient adaptability for angled passage creation.
Solution Approach 2:
The guiding means provide passive geometric feedback through the mechanical structure itself, where the arrangement of guides, slides, and pivot points naturally restricts motion to specific angular ranges. This inherent feedback mechanism ensures precise angle control without requiring active sensing or control systems.
3Manufacturing precision
If the slide is positioned closer to the holding axis at smaller pivoting angles, then machining precision is improved, but the device structure becomes more complex
Solution Approach 1:
The guiding means create a dynamic geometric relationship where the slide's position relative to the holding axis automatically adjusts based on the pivoting angle. At smaller pivoting angles, the slide naturally positions closer to the holding axis through the mechanical coupling, providing better machining precision. This dynamic behavior is achieved through clever mechanical design rather than complex active control systems.
Solution Approach 2:
The guiding means act as an intermediary mechanism that translates the pivoting motion into corresponding translational motion of the slide. This intermediary function automatically positions the slide at optimal locations for different pivoting angles, improving precision at small angles while maintaining device simplicity through passive mechanical coupling.
4Ease of operation
If the coronal emergence is positioned away from active tooth parts, then functionality is improved, but machining the angled second passage section becomes more difficult with conventional machines
Solution Approach 1:
The guiding means enable dynamic repositioning of the milling tool to achieve the required angled orientation for creating the second passage section. This dynamic capability allows the coronal emergence to be positioned optimally away from active tooth parts while maintaining ease of manufacture through a relatively simple mechanical guiding system rather than complex programmed operations.
Data Source
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AI summary
A machining aid (1) for machining a dental prosthesis blank (2) by material removal, said dental prosthesis blank (2) comprising a first cutout extending from a proximal end (2a) of said dental prosthesis blank (2) along a first longitudinal axis (VV). The aid (1) enables the machining, by means of a milling tool (7), of a second cutout in the dental prosthesis blank (2), said second cutout extending obliquely from the first cutout such that the first and second cutouts form a non-zero angle with each other.