Dental Prosthesis Positioning Using Keyed Impression Repositioning
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Solution Overview
Problem
The accurate positioning of workpieces, particularly dental prostheses, in machine tools is complex and time-consuming due to the need for precise mapping of coordinate systems and is hindered by mechanical probes that are sensitive to temperature fluctuations and require significant machine modifications.
Innovation Solution
A method involving the creation of a duplicate workpiece on a base with key structures that allow precise repositioning using a counter piece, allowing for accurate mapping of coordinate systems through the use of mobile intraoral scanners and reference marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical measuring probes are used for positioning, then positioning accuracy can be achieved, but the system becomes sensitive to temperature fluctuations and requires structural modifications to the machine
Solution Approach 1:
The patent creates a digital duplicate (virtual model) of the workpiece from existing design data, then uses this digital copy to generate positioning information. This eliminates the need for physical measuring probes and complex mechanical positioning systems, while maintaining high positioning accuracy through digital coordinate mapping.
Solution Approach 2:
The patent replaces mechanical measuring probes and physical positioning systems with a digital/computer-based system. The positioning is achieved through software processing of the digital duplicate and coordinate system mapping, eliminating temperature sensitivity and structural modification requirements associated with mechanical systems.
2Measurement precision
If mechanical measuring probes are used for positioning, then positioning can be performed, but the process becomes costly and time-consuming
Solution Approach 1:
The patent performs preliminary actions by creating the digital duplicate and extracting positioning information before the actual machining process. The coordinate system mapping and positioning data are prepared in advance from the digital model, eliminating time-consuming on-site measurements and iterative positioning adjustments during machining operations.
Solution Approach 2:
By using a digital duplicate instead of physical measuring probes, the system eliminates the time required for manual probe measurements and calculations. The positioning information is directly obtained from the digital model through automated coordinate mapping, significantly reducing positioning time while maintaining accuracy.
3Measurement precision
If coordinate system mapping is performed for accurate positioning, then positioning precision is improved, but the process becomes complex and time-consuming
Solution Approach 1:
The patent simplifies coordinate system mapping by working with a digital duplicate rather than the physical workpiece. The virtual model provides a standardized reference framework that automatically establishes coordinate relationships, eliminating complex manual coordinate transformations and reducing mapping complexity while maintaining precision.
Data Source
AI summary
A method for precisely positioning a dental prosthesis workpiece in a machine tool includes creating an impression on a part positionable with respect to the tool in a known position in the tool, allowing arrangement of the workpiece precisely on the impression. The device includes a blank and a counter on which an impression is formed. The blank and the counter have key structures so they can be separated from each other and reproducibly reconnected in the same arrangement. An alternative on a computational basis is to provide the workpiece with referencing bodies, to determine their positions by scanning the workpiece, machining steps being generated based on the scan, and to scan the workpiece in a tool on a blank provided with key structures whose tool coordinates are known to determine the position of the workpiece in the tool both in terms of tool and construction system coordinates.