Photocurable Dental Composition for Heat-Sterilization Dimensional Accuracy
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Solution Overview
Problem
Dental products made from photocurable compositions suffer from dimensional accuracy loss due to deformation during heat sterilization.
Innovation Solution
A photocurable composition comprising specific monomers with controlled oxygen atom distances in (meth)acryloyloxy groups and a photopolymerization initiator, achieving a storage modulus of 3.0×10^8 Pa or more at 135°C, which inhibits deformation during heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-dimensional modeling product is heat-sterilized, then sterilization is achieved, but dimensional accuracy deteriorates due to deformation
Solution Approach 1:
The patent changes the chemical composition parameters of the photocurable composition by selecting specific monomers with controlled oxygen atom distances (13.0-17.0 Å) between (meth)acryloyloxy groups. This compositional parameter change results in a cured product with enhanced thermal stability, maintaining dimensional accuracy within ±0.1% after heat sterilization at 135°C, thus resolving the contradiction between achieving sterilization and maintaining manufacturing precision.
Solution Approach 2:
The patent creates a composite material system by combining multiple (meth)acrylic monomers with specific structural characteristics. The composite consists of monomers having oxygen atom distances within the 13.0-17.0 Å range, which work synergistically to provide both curability and thermal resistance. This composite material approach enables the three-dimensional modeling product to withstand heat sterilization while maintaining dimensional accuracy.
2Manufacturing precision
If the storage modulus at high temperature is increased to prevent deformation, then dimensional accuracy improves, but the composition complexity increases
Solution Approach 1:
The patent simplifies the composition design by establishing a clear parameter criterion: oxygen atom distance between (meth)acryloyloxy groups should be 13.0-17.0 Å. This single structural parameter control enables selection of suitable monomers (such as cyclic di(meth)acrylic monomers with specific ring structures) that inherently provide high storage modulus at 135°C (3.0×10^8 Pa or more), achieving dimensional accuracy without complex multi-component formulations.
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 composition maintains excellent dimensional accuracy of three-dimensional modeling products after heating, including dental products, by preventing deformation during heat sterilization.
Implementation Method 1
a rectangular sheet-like test piece P1 with a length of 40 mm, a width of 10 mm, and a thickness of 0.5 mm is produced by photomodeling under conditions in which the photocurable composition is irradiated with visible light having a wavelength of 405 nm at an irradiation dose of 11 mJ/cm2 to form a cured layer P1
Implementation Method 2
the modeling product P1 is irradiated with ultraviolet rays having a wavelength of 365 nm at an irradiation dose of 3 J/cm2 to produce the test piece P1
Data Source
AI summary
A photocurable composition, wherein: in a case in which a rectangular sheet-like test piece P1 with a length of 40 mm, a width of 10 mm, and a thickness of 0.5 mm is produced by photomodeling under specific conditions, and a storage modulus is measured for the thus produced test piece P1 by dynamic viscoelastic measurement with a measurement frequency of 1 Hz while increasing a temperature in a range of from 25° C. to 300° C. at a rate of 3° C./min, the storage modulus at 135° C. is 3.0×108 Pa or more.