Color Mapping in Dental Stereolithography
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Solution Overview
Problem
Current methods for producing dental prostheses, such as implant crowns, fail to accurately replicate the natural tooth's aesthetic appearance due to monochromatic finishes, require multiple processing steps leading to increased costs and material wastage, and suffer from tool wear, resulting in decreased machining precision over time.
Innovation Solution
A method involving a three-dimensional scan of the dental arch to generate a file with spatial coordinates and color information, processed to associate the same color with points having the same z-coordinate, then used in a laser stereolithography machine to create a model with varying colors by mixing two different resin colors, allowing for a single processing step and realistic color gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional machining methods are used to produce dental prostheses, then the production process is straightforward, but the aesthetic quality is poor due to monochromatic appearance and inability to replicate natural tooth optical variations
Solution Approach 1:
The invention changes the fundamental parameter of material application from subtractive machining to additive stereolithography, enabling precise control of color and optical properties at each layer while maintaining manufacturing efficiency. The digital model allows independent control of geometric and chromatic parameters.
Solution Approach 2:
The invention uses composite resin materials with varying optical properties, transparency, and color characteristics to replicate the layered structure of natural teeth. Different resin compositions are applied in successive layers to achieve realistic optical effects.
2Manufacturing precision
If multiple processing steps are used to improve aesthetic quality, then the aesthetic appearance improves, but production time increases and costs rise
Solution Approach 1:
The invention merges multiple separate operations (machining, coating, finishing) into a single additive manufacturing process. The stereolithography process deposits and cures resin layers in one continuous operation, eliminating intermediate handling and reducing production time.
Solution Approach 2:
The invention performs preliminary digital modeling and color mapping before physical production. The digital twin allows all aesthetic decisions to be finalized beforehand, eliminating the need for iterative adjustments and manual finishing operations.
3Manufacturing precision
If traditional machining methods are used, then equipment is simple, but material wastage is considerable due to subtractive process
Solution Approach 1:
The invention replaces mechanical machining with photopolymerization. Instead of removing material through cutting tools, the stereolithography process selectively cures resin layers, adding material only where needed and eliminating material removal waste.
4Manufacturing precision
If manual finishing treatments are applied to stereolithographic models, then aesthetic quality improves, but the process becomes more complex and time-consuming
Solution Approach 1:
The invention makes the system self-sufficient by integrating color control directly into the manufacturing process. The stereolithography machine automatically applies the correct resin composition and color for each layer based on the digital model, eliminating the need for external manual finishing operations.
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 reduces production time and costs, minimizes material wastage, maintains machining precision, and achieves a more aesthetically realistic dental prosthesis with a potentially infinite number of shades, surpassing the limitations of prior art.
Implementation Method 1
obtain a stereolithographic model of said at least part of tooth based on said second file by subsequent polymerization of layers of a liquid material arranged along the elevation axis Z
Implementation Method 2
scanning the layer of liquid substance by means of a laser, polymerizing it
Data Source
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AI summary
The invention relates to a method for the production of a dental article, the method comprising : performing a three-dimensional scan of a portion of a dental arch including at least part of a tooth; generating a first file containing a three-dimensional model of the at least part of tooth scanned, said three- dimensional model comprising (i) spatial coordinates, in a three- dimensional space having an elevation axis Z, of a plurality of points belonging to an outer surface of the at least part of the tooth scanned and (ii) a colour of the outer surface associated with each point of the plurality; processing the first file by associating a same colour with all the points having the same coordinate value in the elevation axis Z, thereby obtaining a second file; sending the second file to a laser stereolithography machine; obtaining a stereolithographic model of said at least part of tooth based on said second file by subsequent polymerization of layers of a liquid material arranged along the elevation axis Z, so as to obtain the stereolithographic model having for each coordinate value in the elevation axis Z a same colour as present in said second file.