Dentin Permeability Flow Cell With Angled Venting Channel
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Solution Overview
Problem
Current methods for measuring dentin permeability, such as the Pashley method, face inaccuracies due to design limitations, including leaks, inconsistent flow rates, and the inability to standardize measurements across different dentin samples, requiring large sample sizes for statistically significant results.
Innovation Solution
A modified flow cell design with a venting channel forming a positive angle relative to the bottom side of a horizontal cross-sectional plane, along with a reversible dentin sample securing mechanism and a high-precision pressure regulator, allows for accurate and standardized measurement of hydraulic conductance through dentin samples, minimizing leaks and enabling quick sample handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Pashley method is used to measure dentin permeability, then fluid flow can be measured across dentin samples, but measurement accuracy deteriorates due to leaks and inconsistent flow rates
Solution Approach 1:
The flow cell is divided into multiple sealed chambers (first chamber, second chamber, third chamber) with distinct functions. The dentin sample is positioned between sealed first and second chambers, while a separate third chamber handles fluid reservoir functions. This segmentation isolates the measurement zone from potential leak sources and enables independent control of each chamber, thereby improving measurement accuracy and consistency.
Solution Approach 2:
A movable partition with a seal is introduced as an intermediary element between the first and second chambers. This partition can be positioned to seal against the dentin sample edges, creating a controlled flow path that prevents lateral leakage. The partition acts as a mediator that ensures fluid flows only through the intended path across the dentin sample, eliminating inconsistent flow rates caused by leaks.
2Productivity
If multiple dentin samples are tested, then more data can be collected, but standardization of flow rates across samples deteriorates
Solution Approach 1:
The flow cell design incorporates universal features that work consistently across multiple dentin samples. The standardized chamber dimensions, seal locations, and flow path geometry ensure that each sample is tested under identical conditions. The movable partition and adjustable components allow the same cell to accommodate different sample sizes while maintaining consistent flow rates, enabling standardized measurements across multiple samples without requiring separate calibration for each.
Solution Approach 2:
The system allows for controlled adjustment of flow parameters (such as pressure differential and flow rate) to standardize measurements across different dentin samples. By modifying these parameters systematically, consistent flow conditions can be established for each sample, ensuring that variations in measurements reflect true differences in dentin permeability rather than inconsistencies in testing conditions.
3Measurement precision
If dentin samples are secured firmly to prevent leaks, then measurement accuracy improves, but ease of operation deteriorates due to inability to remove and reposition samples
Solution Approach 1:
The flow cell incorporates movable and adjustable components, including a movable partition that can be repositioned along the chamber and adjustable sealing mechanisms. These dynamic elements allow the cell to transition between a tightly sealed state (when samples are in place) and an open state (when samples need to be removed). The movable partition can be retracted to allow sample insertion/removal, then repositioned to create seals for measurement, providing both secure sealing and ease of operation.
4Device complexity
If air bubbles are allowed to accumulate under dentin samples, then the simple flow cell design is maintained, but measurement accuracy deteriorates
Solution Approach 1:
A dedicated venting channel is extracted as a separate functional element from the main flow path. This venting channel provides a specific route for air bubbles to escape from the chamber, separate from the measurement flow path. By extracting this air removal function into a dedicated channel, the design maintains simplicity while effectively eliminating air bubble accumulation that would otherwise compromise measurement accuracy.
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 new flow cell design enhances measurement accuracy and throughput, reducing errors and the need for large sample sizes, while allowing for standardized flow rates across different dentin samples, thus improving the reliability and efficiency of dentin permeability testing.
Implementation Method 1
the venting channel forms a positive angle θ relative to a bottom side of a horizontal cross-sectional plane through the bottom component, which horizontal cross-sectional plane intersects the inner opening of the venting channel such that the angle θ ranges from greater than about 0° to less than about 90°
Data Source
AI summary
The present invention relates to devices and methods for measuring the permeability of dentin. More particularly, the invention relates to devices and methods of quickly and accurately measuring the permeability of dentin using a flow cell.