Dental Prosthesis Mounting Tool for 3D Measurement Precision
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Solution Overview
Problem
Conventional methods for producing dental prostheses, such as CAD/CAM systems, face challenges in accurately measuring and processing large dental prostheses with complex geometries, like bridges, due to limitations in existing three-dimensional measuring devices, which result in inaccurate data and increased production costs.
Innovation Solution
A measured object mounting tool with a cylindrical part, inclined part, pillar part, and mounting part is used in conjunction with a three-dimensional measuring device to accurately extract the coordinates of the dental prosthesis shape, allowing for the production of three-dimensional shape data that excludes the engaging portion, enabling precise cutting of dental prostheses using an automatic cutting machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional three-dimensional measuring device is used to measure large dental prostheses with complex geometries, then the measuring process can be performed, but the measurement precision deteriorates due to inability to accurately distinguish boundary between engaging and non-engaging portions
Solution Approach 1:
The measuring process is segmented into two distinct phases: first measuring the entire model including engaging portions, then separately measuring only the engaging portions. This segmentation allows the system to handle complex geometries by breaking down the measurement task into manageable parts, improving overall measurement precision without requiring a more complex device
Solution Approach 2:
The engaging portions are extracted as a separate measurement target. The system specifically identifies and measures the engaging portions (abutment portions) distinct from the main prosthesis body. This extraction approach enables accurate boundary detection between engaging and non-engaging portions, resolving the measurement precision issue
2Productivity
If manual labor methods are used to produce dental prostheses, then flexibility in handling complex geometries is maintained, but productivity deteriorates due to remarkable time consumption
Solution Approach 1:
The system performs preliminary measurement actions by first capturing the complete three-dimensional data of the entire dental prosthesis model, including both engaging and non-engaging portions. This preliminary comprehensive measurement establishes a complete digital reference that guides subsequent selective measurement and data processing, improving productivity by avoiding repeated measurements
Solution Approach 2:
The system uses feedback from the measured three-dimensional coordinates to automatically determine the boundary between engaging and non-engaging portions. The measured data feeds back into the processing system, which then generates precise cutting data for the dental prosthesis, eliminating manual intervention and significantly improving productivity
3Manufacturing precision
If three-dimensional shape data including engaging portions is used for cutting, then complete model data is available, but manufacturing precision deteriorates due to inclusion of unnecessary engaging portion data
Solution Approach 1:
The system extracts only the necessary three-dimensional shape data corresponding to the non-engaging portions of the dental prosthesis. By separating the engaging portion data from the complete model data, the system ensures that cutting operations use only the relevant geometric information, improving manufacturing precision without losing essential prosthesis shape data
Solution Approach 2:
The three-dimensional data is segmented into two distinct datasets: one representing the engaging portions (abutment portions) and another representing the non-engaging portions (crown portions). This data segmentation allows the cutting machine to process only the appropriate portions with the required precision, while preserving complete model information for reference and quality control
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 allows for the accurate production of dental prostheses with complex geometries by distinguishing the boundary between the engaging and non-engaging portions, ensuring proper fit and aesthetic quality, while reducing production time and costs.
Implementation Method 1
measuring the received light amount of laser light from the cylindrical part and the pillar part
Data Source
AI summary
A measured object mounting tool 2 for producing a three-dimensional shape data comprises a placing part 2b at the lower face of a cylindrical part 2a, an inclined part 2c at a boundary between the side face and the upper face of the cylindrical part 2a, and a pillar part 2d at the upper face of the cylindrical part 2a, where the pillar part 2d has a mounting part 2e at the upper face thereof, a three-dimensional coordinate other than the engaging portion 3a of a model 3 is produced by engaging the model of the dental prosthesis with the mounting part 2e of the tool 2 on a placing table 1; detecting a position where a received light amount is remarkably decreased to by a laser sensor detect a lower end of the inclined part 2c; and thereby calculating an upper end of the engaging portion 3a.