Rectangular Toothbrush Tufts for Plaque Removal and Gum Care
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Solution Overview
Problem
Conventional toothbrushes with circular or oval tufts have limited cleaning and paste foaming capabilities, struggle to remove plaque and debris from teeth and gum surfaces, and can be harsh on sensitive gums, leading to inadequate cleaning and discomfort during brushing.
Innovation Solution
A toothbrush head design featuring tufts of cross-shaped filaments with a low packing factor and specific geometry, providing improved capillary effects for plaque removal and gentle gum massage, combined with elastomeric elements for enhanced cleaning and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional circular or oval tufts are used, then the toothbrush structure is simple and easy to manufacture, but the cleaning capability and paste foaming capability are limited
Solution Approach 1:
The patent applies asymmetry by changing the tuft cross-sectional shape from conventional circular/oval to rectangular or square. This asymmetric geometry increases the surface area and creates better capillary effects for plaque removal and paste foaming, while maintaining manufacturing simplicity through standard molding processes
Solution Approach 2:
The patent changes the geometric parameters of the tufts by using rectangular or square cross-sections instead of circular ones. This parameter change increases the surface area-to-volume ratio and enhances capillary action, thereby improving cleaning capability and paste foaming without complicating the manufacturing process
2Ease of manufacture
If standard tufts are used, then the manufacturing process is simple, but the capillary effects for plaque removal are insufficient
Solution Approach 1:
The rectangular or square cross-sectional shape creates asymmetric capillary channels that enhance capillary effects for drawing plaque and debris away from tooth surfaces. This geometric asymmetry improves plaque removal reliability while maintaining simple manufacturing through conventional molding
Solution Approach 2:
The patent utilizes the tuft structure as a porous element where the rectangular/square geometry creates optimized pore structures for capillary action. This enhances the ability to draw plaque and debris into and through the tuft, improving plaque removal effectiveness without complex manufacturing
3Productivity
If large tuft dimensions are used, then foam formation and polishing effects are improved, but the brushing sensation becomes unpleasant and harmful to sensitive gums
Solution Approach 1:
The patent applies local quality by using rectangular or square tuft cross-sections that concentrate cleaning action at the corners and edges while maintaining softer overall contact. This localized enhancement of cleaning effectiveness at specific points (corners/edges) allows for good foam formation and polishing without uniformly harsh contact across the entire tuft surface
Solution Approach 2:
The asymmetric rectangular/square geometry creates varied contact points with the gum surface, concentrating mechanical action at corners while leaving other areas softer. This asymmetric distribution reduces uniformly harmful effects on sensitive gums while maintaining effective foam formation and polishing at critical cleaning locations
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 superior cleaning performance, gentle in-mouth perception, and extended toothpaste retention, ensuring effective plaque removal and gum care while maintaining brush comfort and longevity.
Implementation Method 1
standard tufts do not provide sufficient capillary effects to remove plaque and debris from the teeth and gum surfaces during brushing
Data Source
Figure 1
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AI summary
A head for an oral care implement has a longitudinal length extension extending between a proximal end and a distal end, an outer rim and an inner portion. The head comprises at least two tooth cleaning elements of a first type and a plurality of tooth cleaning elements of a second type, the tooth cleaning elements of the first type being arranged at the inner portion of the head, and the plurality of tooth cleaning elements of the second type being arranged at the outer rim of the head, thereby surrounding the tooth cleaning elements of the first type. The tooth cleaning elements of the first type are tufts of a first type comprising a plurality of filaments. The tufts of the first type are arranged substantially parallel to each other. Each tuft has a substantially rectangular or oval cross-sectional shape with a longer length extension from about 4 mm to about 8 mm and a shorter width extension from about 1.5 mm to about 2.5 mm, wherein the longer length extension defines an angle α with respect to the longitudinal length extension of the head of about 25° to about 60°.