Multi-Layer Abrasive Disc for Dental Finishing
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Solution Overview
Problem
Conventional four-step finishing and polishing systems in dentistry are labor-intensive and time-consuming, often requiring multiple steps to achieve anatomically-conformed shapes and high luster, with potential for scratches that can trap plaque and debris.
Innovation Solution
A two-step finishing and polishing system using discs with a base coat of conventional abrasives and a top layer of spherical grit particles, including imbedded diamond particles, which reduces scratches and achieves comparable results to conventional four-step systems in less time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional four-step finishing and polishing systems are used, then anatomically-conformed shapes and high luster are achieved, but the process is labor-intensive and time-consuming
Solution Approach 1:
The patent combines multiple finishing and polishing steps into a single integrated disc system. The disc incorporates multiple layers with different abrasive grain sizes (coarse, medium, fine, and ultrafine) stacked in sequence, allowing all four conventional steps to be performed with one disc rather than four separate discs, thereby reducing time and labor while maintaining surface finish quality
Solution Approach 2:
The polishing disc is segmented into multiple functional layers, each containing abrasive grains of specific size ranges. The coarse layer (100-200 μm) handles material removal, the medium layer (50-100 μm) refines the surface, the fine layer (20-50 μm) smooths further, and the ultrafine layer (5-20 μm) achieves final gloss. This segmentation allows each layer to perform its specific function efficiently within a single disc
2Manufacturing precision
If multiple discs are used in sequence, then surface smoothness is improved, but the number of steps and disc changes increases
Solution Approach 1:
The patent merges four separate polishing discs into one multi-layered disc. Each layer contains abrasive grains of progressively finer size, replicating the function of four separate discs but integrated into a single tool that requires no changing during the polishing process
Solution Approach 2:
The single polishing disc performs multiple functions that traditionally required four different discs: gross material removal, intermediate smoothing, fine surface refinement, and final gloss enhancement. This multi-functional disc simplifies the device while maintaining comprehensive surface treatment capability
3Productivity
If conventional abrasive discs are used, then finishing is achieved, but scratches are generated that can trap plaque
Solution Approach 1:
The patent systematically changes the abrasive grain size parameter across different layers, progressing from coarse (100-200 μm) to ultrafine (5-20 μm). This gradual parameter change allows aggressive material removal initially, then progressively smoother finishing, minimizing scratch generation while maintaining efficient productivity
Solution Approach 2:
The polishing disc uses composite construction with multiple layers containing different abrasive materials and grain sizes. Each layer is a composite of abrasive grains embedded in a bonding matrix, creating a structured material system that delivers progressively finer finishing actions to eliminate scratches
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
The two-step system significantly reduces the time required for finishing and polishing, minimizes scratches, and achieves a smooth, glossy surface comparable to conventional four-step systems, while preventing plaque accumulation.
Implementation Method 1
a two part abrasive system for finishing and polishing surfaces comprising (i) a first finishing part comprising a conventional grit particle abrasive and (ii) a second polishing part comprising spherical grit particles having imbedded diamond particles
Data Source
Figure 1~2
Figure 3
AI summary
A two-unit system for finishing and polishing a target surface such as a dental restoration or appliance. A two-unit system and the method of employing such a system may include a finishing unit that combines gross reduction and final contouring capabilities into the single finishing unit that still results in leaving a smooth surface finish. A separate polishing unit may also be provided that combines contacting the target surface to polish and to achieve high gloss luster into the single unit.