Toothbrush Head Bristle Layout for Plaque Removal Without Gum Irritation
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Solution Overview
Problem
Existing toothbrushes struggle to balance effective cleaning of tooth surfaces, particularly hard-to-reach areas, with gentleness to the gingiva, often causing irritation or requiring prolonged brushing times.
Innovation Solution
A toothbrush design featuring a combination of non-tapered, end-rounded first bristles and chemically tapered split-end second bristles, arranged to optimize cleaning efficacy and gingival protection, with the first bristles focusing on exposed surfaces and the second bristles reaching interproximal and subgingival areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rigid bristles are used for efficient cleaning of tooth surfaces, then cleaning efficiency is improved, but gingival irritation or damage occurs
Solution Approach 1:
The toothbrush head is segmented into different bristle zones: rigid non-tapered bristles for cleaning tooth surfaces and soft tapered bristles for the gingival margin area. This spatial segmentation allows each zone to perform its specific function without causing harm to the gingiva.
Solution Approach 2:
Different bristle properties are applied to different locations: the central and lateral areas have rigid non-tapered bristles for effective plaque removal, while the gingival margin area has soft tapered bristles that gently clean without irritating the gum tissue. Each location receives the appropriate bristle characteristics for its specific cleaning needs.
2Object-affected harmful factors
If soft unitary bristles are used for gentleness to the gingiva, then gingival protection is improved, but cleaning effectiveness on hard to reach surfaces is insufficient
Solution Approach 1:
The bristle system is divided into two functional segments: soft tapered bristles positioned at the gingival margin for gentle cleaning and protection, and rigid non-tapered bristles in the central and lateral zones for effective plaque removal from tooth surfaces. This segmentation ensures both gingival protection and thorough cleaning.
Solution Approach 2:
The toothbrush head provides locally optimized bristle properties: soft tapered bristles where gingival contact occurs to prevent irritation, and rigid non-tapered bristles where plaque accumulation occurs to maximize cleaning effectiveness. Each area receives the bristle quality it needs for optimal performance.
3Length of moving object
If tapered bristles are used for good penetration into hard to reach surfaces, then penetration ability is improved, but brushing pressure is limited due to flexibility
Solution Approach 1:
The bristle system segments the penetration function to specific tapered bristles positioned at the gingival margin, while rigid non-tapered bristles handle the pressure application on tooth surfaces. This allows tapered bristles to penetrate interproximal spaces without compromising overall brushing pressure.
Solution Approach 2:
Tapered bristle geometry is applied locally at the gingival margin where penetration into periodontal pockets is needed, while non-tapered bristles maintain structural integrity for pressure application. Each bristle type is positioned where its specific geometric properties provide the necessary function.
4Length of moving object
If split end bristles with thin ends are used for penetration, then penetration into interproximal spaces is improved, but bristles bend or fold under brushing force requiring longer brushing time
Solution Approach 1:
The brush head segments penetration function to tapered bristles with controlled split ends positioned at the gingival margin, while rigid non-tapered bristles provide structural support and maintain brushing pressure. The segmented design prevents excessive bending of penetration bristles by distributing mechanical loads.
Solution Approach 2:
Split end geometry is applied locally to specific bristles positioned where interproximal penetration is needed, while adjacent bristles maintain full-diameter construction for mechanical strength. This localized application of split ends provides penetration capability without compromising overall bristle rigidity and brushing efficiency.
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 design achieves thorough cleaning of both exposed and hard-to-reach tooth surfaces while minimizing gingival irritation, reducing the risk of periodontal conditions like gingivitis and periodontitis.
Implementation Method 1
The polymer resin of the sheath has a higher dissolution rate in tapering solution than the polymer resin of the core(s). Upon immersing the bristle in tapering solution, the sheath resin dissolves more quickly than the core resin, exposing the core(s), resulting in chemically tapered, split end bristles.
Data Source
AI summary
This disclosure provides a toothbrush head and a toothbrush with improved toothbrush bristle configuration comprising different types of bristle filaments in a specified arrangement. Disclosed are toothbrush heads comprising first tufts (5) comprising first bristles (6) and second tufts (7) comprising second bristles (8), wherein the second tufts (7) are positioned outermost closest to the distal end (3A) and outermost closest to the proximal end (3B) on the bristle surface (3), and/or outermost closest to the widthways opposite ends (3C, 3D) on the bristle surface (3), and wherein the second bristles (8) have a stem (19) that splits into split ends (21), and wherein the split ends (21) are chemically tapered. Also provided are toothbrushes comprising said toothbrush heads. The toothbrushes achieve excellent brushing performance, plaque removal from the gingival and subgingival margin and reach into the interproximal spaces. There are also disclosed methods of manufacturing these toothbrushes.