Continuous Dental Composite Block Production via Controlled Curing
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Solution Overview
Problem
Existing methods for producing dental composite blocks face challenges in controlling polymerization shrinkage and ensuring quality, as they require complex and difficult-to-control active pressing to avoid defects.
Innovation Solution
A method using a substantially hollow-cylindrical device with a temperature control unit for continuous curing of curable composite material, allowing controlled energy input over a defined length and time, with continuous supply and compression to produce dimensionally stable blocks with fewer defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If active pressing is applied to avoid polymerization shrinkage, then dimensional stability is improved, but device complexity and difficulty of control increase
Solution Approach 1:
The mold cavity is pre-designed with a slightly larger volume than the final desired block dimensions, anticipating the polymerization shrinkage that will occur. This preliminary dimensional compensation eliminates the need for complex active pressing mechanisms during curing, as the shrinkage naturally results in the correct final dimensions.
Solution Approach 2:
The system utilizes the inherent polymerization shrinkage of the composite material as a self-regulating mechanism. By controlling the curing process and mold geometry, the material's natural shrinkage behavior is harnessed to achieve dimensional stability without requiring external active pressing intervention.
2Productivity
If continuous curing is implemented, then productivity is improved, but control of polymerization shrinkage becomes more difficult
Solution Approach 1:
The continuous curing process is divided into controlled zones along the extrusion path, with each zone receiving specific energy input timing. This segmentation allows different portions of the composite material to be cured at different times, maintaining dimensional control while enabling continuous production.
Solution Approach 2:
The mold geometry is pre-configured to account for continuous processing shrinkage characteristics, and the energy input timing is predetermined for different positions along the extrusion path, enabling continuous curing while maintaining precision through advance planning rather than real-time adjustment.
3Loss of time
If energy input is increased for rapid curing, then production time is reduced, but quality and dimensional stability may deteriorate
Solution Approach 1:
Energy input is applied in periodic cycles rather than continuously at high intensity. The curing process uses multiple lower-intensity energy input stages spaced throughout the extrusion path, achieving complete curing without the thermal shock and quality degradation that would result from a single high-intensity energy input burst.
Solution Approach 2:
Energy input is localized to specific positions along the extrusion path rather than applied uniformly. Different regions receive energy input at different times and intensities, with the energy distribution optimized for each local position to achieve rapid curing while maintaining quality and dimensional stability.
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 method enables rapid and controlled production of dental composite blocks with improved properties and reduced defects, allowing for precise curing and adaptation to various sizes and compositions.
Implementation Method 1
The introduced, curable composite material is cured by means of an energy input by means of a temperature control unit (5). The energy input is thereby maintained until a substantially dimensionally stable composite block has been produced.
Implementation Method 2
A curable composite material and a temperature control unit (5) are provided. The curable composite material is introduced, in particular continuously introduced, into the device (1) through the first opening (2). The introduced, curable composite material is cured by means of an energy input by means of the temperature control unit (5).
Data Source
AI summary
A hollow-cylindrical device (1) having first and second openings (2, 3) for continuous production of a dental composite block. A curable composite material (4) and a temperature control unit (5) are provided. The composite material (4) is introduced into the device (1) through the first opening. The composite material (4) is cured by energy from the temperature control unit (5). An energy input occurs across a defined length of the substantially hollow-cylindrical device (1) and/or for a defined period of time. The composite material (4) is subsequently guided through the first opening (2) of the device (1). The composite material (4) is discharged from the second opening (3). In a first region along a portion of the length of the device, the device is either provided with an insulation or the flow-through device has a heat conductivity of 0.05 to 12 W/(m×K).