Dentin Permeability Flow Cell with Angled Venting Channel
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Solution Overview
Problem
The Pashley method for measuring dentin permeability is limited by inaccuracies, difficulty in removing and reinserting dentin samples, and inability to standardize flow rates across different samples, requiring large sample sizes for statistically significant readings.
Innovation Solution
A 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 removable lid and washers for securing dentin samples, allows for accurate measurement of hydraulic conductance by removing air bubbles and standardizing fluid flow rates across different samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the Pashley method uses a split-chamber device with paired O rings to secure dentin samples, then the dentin sample can be held in place for measurement, but the design does not allow for easy removal and reinsertion of the dentin sample for further challenge testing
Solution Approach 1:
The flow cell is divided into separate components including a base portion with an opening, a removable cover, and distinct securing mechanisms. This segmentation allows the dentin sample to be easily inserted and removed by simply opening the cover, while each component serves a specific function that collectively solves the contradiction between ease of operation and device complexity.
2Measurement precision
If the Pashley method measures fluid flow rate across dentin samples, then permeability data can be obtained, but the method cannot standardize flow rates across different dentin samples requiring large sample sizes for statistical significance
Solution Approach 1:
The flow cell incorporates a venting channel that provides feedback by allowing air bubbles to escape and equalize pressure during fluid flow measurement. This feedback mechanism ensures accurate and standardized flow rate measurements across different dentin samples by maintaining consistent pressure conditions, thereby improving measurement precision and reducing the number of samples needed for statistical significance.
3Measurement precision
If fluid is forced through the dentin sample in the Pashley method, then hydraulic conductance can be measured, but air bubbles accumulate under the dentin sample causing measurement inaccuracies
Solution Approach 1:
The venting channel is designed to extract and remove air bubbles from the measurement system. The channel extends from the base portion and allows trapped air to escape as fluid is forced through the dentin sample, eliminating the harmful effect of air bubble accumulation and improving measurement precision.
4Reliability
If the flow cell uses a complex multi-component design to secure samples, then measurement reliability can be improved, but the time required for sample preparation and measurement increases reducing throughput
Solution Approach 1:
The flow cell components are pre-configured with integrated securing mechanisms and venting channels during manufacturing. The washer and cover are designed to work together as a pre-assembled unit that quickly secures the dentin sample in the correct position. This preliminary preparation of components eliminates time-consuming assembly steps during sample preparation, thereby improving productivity while maintaining measurement reliability.
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 solution enhances measurement accuracy, reduces sample size requirements, and enables faster and more reliable data collection while maintaining data integrity.
Implementation Method 1
the venting channel positioned for receiving any air in the form of at least one air bubble that might accumulate under a dentin sample secured by the securing mechanism after introduction of a fluid into the flow cell through the flow inlet channel
Implementation Method 2
fluid is forced from an inlet across (or through) one side of a dentin disc sample to the other side and, then, its flow rate measured to determine the rate of fluid flow across the dentin sample
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.