Dental Scan Data Alignment and Merging for Margin Line Precision
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Solution Overview
Problem
Current methods for obtaining margin line information of preparation teeth in dental prosthesis design face challenges due to the difficulty in scanning subgingival regions of plaster casts, leading to reduced precision and increased work time when using wide-field scanners or segmenting plaster models.
Innovation Solution
A data processing method that involves obtaining and aligning scan data from different casts, including pre-scan data from an impression-taking cast and second scan data from a trimmed oral cavity cast, with selective merging of data based on intersection distances to generate final scan data that accurately represents the oral cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a table scanner with a wide field of view is used to scan the plaster cast, then the scanning coverage is improved, but the precision of scanning subgingival regions deteriorates
Solution Approach 1:
The patent divides the scanning task into two segments: using a table scanner for general areas and a handheld scanner for subgingival regions. This segmentation allows each scanner to be used in its optimal operating range, resolving the contradiction between wide coverage and high precision scanning
2Measurement precision
If the plaster model is segmented and partially scanned before trimming, then the precision of margin line information is improved, but the work time increases
Solution Approach 1:
The patent performs preliminary scanning of the entire plaster cast before trimming to capture margin line information that would otherwise be lost. This preliminary action ensures that critical data is obtained before the model is modified, avoiding the need for time-consuming segmented scanning after trimming
3Measurement precision
If the plaster cast is trimmed to obtain margin line information, then the precision of margin line identification is improved, but the information about pre-trimming shapes is lost
Solution Approach 1:
The patent performs scanning before the trimming operation to capture the pre-trimming shape information. By conducting this scanning action in advance, the system preserves information that would otherwise be lost when the plaster cast is trimmed to expose subgingival margin lines
Data Source
AI summary
A data processing method according to the present invention comprises obtaining pieces of scan data from different models; aligning the obtained pieces of scan data; and merging a portion of one of the aligned pieces of scan data with another of the aligned pieces of scan data.