Self-Heating Dental Compule Using Conductive Polymer
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Solution Overview
Problem
Highly viscous dental materials with increased filler loading become difficult to extrude from standard plastic compules due to thermal resistance, requiring high power and lengthy heating times, which complicates their adaptation to cavity preparations and increases manufacturing costs.
Innovation Solution
A dental compule made from thermally conductive plastic or electrically conductive polymer 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, thereby facilitating faster and more efficient heating of dental materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If standard plastic compules are used to package highly viscous dental materials, then the materials can be stored and transported, but the thermal resistance of the plastic prevents efficient heating and extrusion
Solution Approach 1:
The compule material is changed from standard plastic to thermally conductive plastic, fundamentally altering the thermal properties of the packaging material to enable efficient heat transfer to the dental composite
Solution Approach 2:
The compule is constructed as a composite structure with an inner chamber made of thermally conductive plastic and an outer shell made of electrically conductive plastic, combining the thermal conductivity needed for heating with the electrical conductivity needed for self-heating capability
2Power
If high power heating is applied to overcome thermal resistance of plastic compules, then heating can be achieved, but the heating time becomes excessively long
Solution Approach 1:
The electrical resistance of the compule material is changed by using electrically conductive plastic, enabling the compule to generate heat internally through resistive heating when electrical current is applied, thereby achieving rapid heating without requiring high external power
Solution Approach 2:
The compule is designed to heat itself by incorporating electrically conductive plastic that generates heat when electrical current is applied, eliminating the need for external heating devices and achieving rapid temperature increase
3Measurement precision
If dedicated microprocessor control circuits with thermocouples are used to control heater temperature, then temperature control is achieved, but manufacturing costs increase significantly
Solution Approach 1:
The compule material itself serves as the heating element through its electrical conductivity, eliminating the need for separate heater components and complex control circuits with thermocouples, thereby significantly reducing manufacturing costs while maintaining functionality
Solution Approach 2:
The heating function is extracted from the dispenser system and integrated directly into the compule material, removing the need for expensive external heating and control components
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 significantly reduces heating time, allowing dental materials to reach desired temperatures up to three times faster than traditional methods, enhancing the efficiency and cost-effectiveness of dental procedures by integrating heating functionality directly into the compule.
Implementation Method 1
an electrically conductive polymer generating heat when electric current is applied to the polymer
Implementation Method 2
a heating unit made of a material having a positive temperature coefficient such that when electric current is applied to the heating unit its electrical resistance increases
Data Source
AI summary
A heater assembly made of positive temperature coefficient (PTC) material such as barium titanate ceramic that may be self-regulating. A dental compule that holds a dental (e.g. composite) material may be made from thermally conductive plastic and/or 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, 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.