Dental Mill Blank Asymmetric Recess for CAD/CAM Orientation
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Solution Overview
Problem
Conventional mill blanks for dental CAD/CAM systems lack directivity recognition in the circumferential direction, making it difficult to install and further cut dental restorations from remaining portions after cutting out other restorations.
Innovation Solution
A mill blank with a substantially columnar shape and at least one recess on its circumference, which does not extend over the whole circumference, allowing for engagement with the CAD/CAM device, and is preferably made of unsintered ceramic material with alumina or zirconia, featuring specific dimensions and particle sizes for stable installation and machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional mill blank with a columnar shape and a circumference groove is used, then the mill blank can be used for cutting dental restorations, but the directivity in the circumferential direction cannot be recognized, making it difficult to install and further machine remaining portions
Solution Approach 1:
The patent applies asymmetry by providing a groove that extends along the circumference but does not extend over the whole circumference, creating an asymmetric feature that provides directivity information. This asymmetric groove configuration allows the mill blank to be correctly oriented during installation in the CAD/CAM device, resolving the issue of unrecognized directivity while maintaining ease of operation.
2Ease of operation
If a groove is added to provide directivity recognition, then installation ease is improved, but the structural complexity of the mill blank increases
Solution Approach 1:
The patent applies local quality by adding the groove feature only in the specific location where directivity information is needed (the circumferential surface), rather than modifying the entire structure. The groove is localized to provide orientation information while leaving the rest of the mill blank structure simple and suitable for dental restoration cutting.
Data Source
AI summary
To provide a mill blank for dental CAD/CAM for preparing a dental restoration by being installed in a CAD/CAM device, wherein, the mill blank for dental CAD/CAM has a substantially columnar shape, the mill blank for dental CAD/CAM has at least one recess in a circumference portion, the recess does not extend over the whole of the circumference portion of the mill blank for dental CAD/CAM, and the recess of the mill blank for dental CAD/CAM is to be engaged with the CAD/CAM device.