Self-Regulating PTC Dental Compule for Rapid Composite Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Highly viscous dental composite materials are difficult to extrude from standard plastic compules due to thermal resistance, requiring high power and lengthy heating times, which increases the cost and complexity of heating devices.
Innovation Solution
A dental compule made from thermally conductive polymer or electrically conductive plastic that generates heat when an electric current is applied, eliminating the need for an external heater and allowing for self-regulation of temperature using positive temperature coefficient materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard plastic compule is used to hold dental composite material, then the compule is easy to manufacture and inexpensive, but the thermal resistance of the plastic requires high power and lengthy heating time to overcome
Solution Approach 1:
The compule material's thermal conductivity parameter is changed from low (standard plastic) to high (thermally conductive plastic), enabling rapid heat transfer to the dental material while maintaining ease of manufacture through injection molding processes
Solution Approach 2:
The compule is made from composite materials that combine thermal conductivity with moldability, such as thermally conductive plastics or metals, allowing simultaneous achievement of fast heating and manufacturing ease
2Speed
If high power heating is used to overcome the thermal resistance of plastic compules, then heating speed increases, but the cost and complexity of the heating device increases
Solution Approach 1:
Changing the compule material's thermal conductivity parameter allows use of lower power heating elements while achieving the same heating speed, thereby reducing device complexity and cost
Solution Approach 2:
The thermally conductive compule acts as an intermediary that efficiently transfers heat from a low-power heating element to the dental material, eliminating the need for high-power heating devices
3Measurement precision
If a dedicated microprocessor control circuit with thermocouple is used to control heater temperature, then temperature control precision improves, but manufacturing cost increases significantly
Solution Approach 1:
The system uses self-regulating PTC heating elements that automatically maintain optimal temperature without external control circuits, eliminating expensive microprocessors and thermocouples while keeping manufacturing simple
Solution Approach 2:
The compule is designed as a disposable component that includes integrated PTC heating material, eliminating the need for expensive reusable control systems in the dispenser device
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 system heats dental materials significantly faster, reducing heating time from 90 seconds to approximately 25 seconds, making it more efficient and cost-effective by integrating the heating function into the compule itself.
Implementation Method 1
The PTC heating element increases electrical resistance with temperature to self-regulate and maintain optimal heating temperature without external control circuits
Implementation Method 2
The thermally conductive compule material transfers heat from the heating element to the dental composite material efficiently
Data Source
AI summary
A combination heater assembly made of positive temperature coefficient (PTC) material such as barium titanate ceramic that may be self-regulating. A dental compule may be generally cylindrical, or another shape, and may hold a dental (e.g. composite) material. The compule may be made from conventional plastic or thermally conductive plastic. A compule may also be made from electrically conductive plastic that is self-heating when an electric current is passed through the compule. A compule may be generally cylindrical and include an electrically conductive polymer that may exhibit PTC characteristics while generating heat when electric current is applied to the polymer through two flat contact areas each disposed along one portion of the generally cylindrical compule, an orifice or opening positioned at one end of the compule, an inner chamber; and extrudable dental material held within the inner chamber.