Dental Polymerization Control via Infrared Emission Detection
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Solution Overview
Problem
Existing methods for determining the degree of polymerization of dental materials are prone to errors due to surface characteristics and moisture levels, leading to inconsistent polymerization results and potential monomer release or edge gaps.
Innovation Solution
A system that detects mid-wavelength infrared radiation emitted by the dental material itself, using adaptable wavelength ranges for impingement and detection radiation, and modulates light or heat sources with a square-wave pulse signal to ensure precise polymerization control, minimizing interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor detects reflected light from the dental material surface, then the energy impingement can be measured, but measurement errors occur due to surface characteristics and moisture levels affecting reflection
Solution Approach 1:
The patent introduces an intermediary substance (reflection-free coating or index-matching gel) between the sensor and the dental material surface. This intermediary eliminates the harmful reflective effects of the moist surface while allowing the sensor to accurately detect the polymerization light, thus resolving the contradiction between being able to measure energy impingement and achieving reliable measurements.
2Reliability
If the sensor is arranged outside the radiation area to avoid reflection errors, then measurement reliability improves, but the ability to detect actual polymerization progress decreases
Solution Approach 1:
By placing the sensor outside the direct radiation path and using an intermediary to transmit or relay the polymerization signal, the system achieves both reliable measurements (no direct reflection interference) and accurate polymerization detection (signal still captured from the material).
3Reliability
If polymerization time is extended to ensure complete polymerization, then monomer release is prevented, but edge gaps form due to excessive polymerization time
Solution Approach 1:
The patent employs feedback control by continuously monitoring the polymerization process through light detection and automatically adjusting or terminating the polymerization cycle when the desired degree of polymerization is achieved. This prevents both incomplete polymerization (monomer release) and excessive polymerization (edge gaps) by providing real-time information about the actual polymerization state.
Solution Approach 2:
The polymerization process is made dynamic and adaptive rather than static and fixed. The system continuously adjusts the polymerization parameters based on real-time feedback from the sensor, allowing the process to respond to actual material conditions and achieve optimal results without forming edge gaps.
4Manufacturing precision
If assay-polymerization is performed to determine optimal polymerization time, then polymerization results are optimized, but additional time and complexity are required
Solution Approach 1:
The real-time feedback system provides continuous information about polymerization progress, eliminating the need for separate assay-polymerization steps. The system directly determines the optimal polymerization time during the actual treatment process, achieving high precision without the time loss and complexity of preliminary assays.
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
This approach allows for accurate, pattern-specific determination of polymerization degree and optimal switch-off times, reducing errors and ensuring consistent polymerization results without additional expenses or assays, while compensating for surface reflectivity and other interference factors.
Implementation Method 1
a sensor which detects mid wavelength infrared radiation emitted by the dental material during polymerization
Implementation Method 2
a light and/or heat source for polymerization
Implementation Method 3
the polymerization of the dental material used depends heavily on numerous factors... the polymerization process
Data Source
AI summary
A device (10) and method for determining and controlling the degree of polymerization of polymerizable dental material (14), which device includes a light and/or heat source (18 or 20), with which the dental material (14) is impinged. The device further includes a control device (26) and a sensor (24) connected to the control device (26), whereby the sensor (24) detects radiation (natural radiation) emitted from the dental material (14) of a predetermined wavelength.