Photocurable Dental Composition Monomer System for Stereolithography
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Solution Overview
Problem
Conventional methods for manufacturing dental prostheses using stereolithography lack photocurable compositions that provide sufficient flexural strength, flexural modulus, and Charpy impact strength, which are essential for practical utility and durability.
Innovation Solution
A photocurable composition comprising specific combinations of (meth)acrylic monomers, including acrylic monomer (X) with ring structures and di(meth)acrylic monomers with ether bonds, along with a photopolymerization initiator, optimized for weight average molecular weights and content ratios to enhance mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional photocurable compositions are used for stereolithography manufacturing, then the manufacturing process can be completed, but the resulting dental prosthesis lacks sufficient flexural strength, flexural modulus, and Charpy impact strength
Solution Approach 1:
The patent employs a composite monomer system combining five specific (meth)acrylic monomers with different molecular weights and functional groups. This composite approach allows the formulation to achieve superior mechanical properties (flexural strength ≥60 MPa, flexural modulus ≥1500 MPa, Charpy impact strength ≥1.0 kJ/m²) that individual monomers cannot achieve alone, resolving the contradiction between manufacturability and structural reliability
Solution Approach 2:
The patent systematically optimizes multiple parameters including molecular weight distribution (ranging from 130 to 800), functional group composition (ether bonds, ring structures, aromatic rings), and monomer content ratios. These parameter changes enable the photocurable composition to achieve the required mechanical strength while maintaining proper curing characteristics for stereolithography manufacturing
2Strength
If conventional photocurable compositions are used for stereolithography manufacturing, then the manufacturing process can be completed, but the resulting dental prosthesis lacks sufficient flexural modulus
Solution Approach 1:
The patent adjusts the molecular weight distribution and functional group composition of the monomer mixture to achieve optimal balance between manufacturability and mechanical performance. The specific parameter ranges (molecular weights 130-800, specific functional group contents) ensure the composition cures properly in stereolithography while achieving flexural modulus ≥1500 MPa, resolving the contradiction between ease of manufacture and mechanical properties
3Reliability
If conventional photocurable compositions are used for stereolithography manufacturing, then the manufacturing process can be completed, but the resulting dental prosthesis lacks sufficient Charpy impact strength
Solution Approach 1:
The patent uses a composite monomer system with five specifically selected (meth)acrylic monomers that work synergistically to achieve high Charpy impact strength (≥1.0 kJ/m²). This composite approach improves durability while the complexity is managed through systematic formulation based on molecular weight and functional group characteristics
Solution Approach 2:
The patent optimizes the content ratios and molecular weight distribution of the monomer components to achieve the required Charpy impact strength. By controlling parameters such as the proportion of low molecular weight monomers (130-240) versus high molecular weight monomers (200-800), the formulation achieves high impact resistance while maintaining manageable composition complexity
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 achieves improved flexural strength, flexural modulus, and Charpy impact strength, making it suitable for manufacturing dental prostheses and denture bases with enhanced durability and practical utility.
Implementation Method 1
a photocurable composition containing a (meth)acrylic monomer component and a photopolymerization initiator
Data Source
AI summary
A photocurable composition for manufacturing a dental prosthesis by stereolithography, including: a photopolymerization initiator; and a (meth)acrylic monomer component including an acrylic monomer (X) having no aromatic rings and having a ring structure other than an aromatic ring and two or more acryloyloxy groups in one molecule and having an Mw of from 200 to 800, and at least one of a (meth)acrylic monomer (A) having one or more ether bonds and two (meth)acryloyloxy groups in one molecule and having a defined Mw, a (meth)acrylic monomer (B) having a ring structure other than an aromatic ring and one (meth)acryloyloxy group in one molecule and having a defined Mw, a (meth)acrylic monomer (C) having a hydrocarbon skeleton and two (meth)acryloyloxy groups in one molecule and having a defined Mw, and a (meth)acrylic monomer (D) having one or more aromatic rings and one (meth)acryloyloxy group in one molecule and having a Mw.