Dental Liquid Container Piston Surface Roughness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dental dispensing devices face challenges in providing a cost-effective, easy-to-use container that prevents anaerobic polymerization of liquids while maintaining air and liquid separation to avoid air bubbles, especially for high viscosity dental materials.
Innovation Solution
A container with a cup-shaped receptacle and a piston featuring a sealing structure on the inner surface of the side wall with an arithmetic average surface roughness of 0.05 μm to 4.5 μm Ra, allowing for a tightly sealed configuration that separates air and liquid, and is made from materials like high density polyethylene, with a method involving injection molding and surface finishing techniques such as sandblasting or etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smooth sealing surface is used between the piston and receptacle wall, then the sealing performance is improved, but air and liquid may mix causing anaerobic polymerization
Solution Approach 1:
The sealing surface is designed with a specific arithmetic average roughness (Ra 0.05-4.5 μm) that creates localized micro-irregularities. These micro-irregularities form air pockets that prevent direct contact between the sealing surface and liquid, thereby preventing anaerobic polymerization while maintaining adequate sealing performance for the application.
2Object-affected harmful factors
If a tightly sealed configuration is used to separate air and liquid, then anaerobic polymerization is prevented, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of using complex multi-component sealing structures, the invention achieves air-liquid separation by controlling the surface roughness parameter (Ra 0.05-4.5 μm) of a simple single-piece piston. This parameter change allows the sealing surface itself to trap air, preventing anaerobic conditions without requiring additional sealing components or complex assembly processes.
3Reliability
If a piston with sealing structure is used to prevent air bubbles, then liquid transfer reliability is improved, but residual liquid amounts increase
Solution Approach 1:
The piston sealing surface features localized micro-roughness (Ra 0.05-4.5 μm) that creates air pockets at the sealing interface. These air pockets act as a barrier that prevents liquid from adhering to the piston surface, thereby reducing residual liquid while maintaining effective sealing during the dispensing process.
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 container effectively prevents anaerobic polymerization, allows for easy use, and is inexpensive to manufacture, ensuring reliable liquid transfer without air bubbles and minimizing residual liquid amounts, suitable for high viscosity dental materials.
Implementation Method 1
The inner surface of the side wall has a rough surface and has an arithmetic average surface roughness of between 0.05 μm and 4.5 μm Ra. The piston forms a circumferential sealing structure which bears on an inner surface of the side wall.
Data Source
AI summary
A container for storing and dispensing a liquid has a generally cup-shaped receptacle formed by a circumferential side wall and a front wall. A piston is slidably accommodated within the receptacle. The receptacle and the piston in combination form a chamber in which the liquid is received. The piston forms a sealing structure bearing on an inner surface of the side wall. The inner surface of the side wall has an arithmetic average surface roughness of between 0.05 μm and 4.5 μm R?a.#191 The container allows for air to penetrate in the chamber while it provides for the liquid to be captured therein.