Dental 3D Printing Resin Composition for Deep Curing at 385 Nm
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Solution Overview
Problem
Existing radiation-curing compositions for dental 3D printing face challenges in achieving optimal mechanical properties, deep curing depths, and environmental/health safety, particularly with phosphine oxide-based initiators like BAPO and TPO, which have regulatory concerns and limited usability due to shallow curing depths and reproductive toxicity.
Innovation Solution
A radiation-curing composition using a combination of hexaarylbiimidazole compounds and mercaptotetrazol compounds with a high proportion of radically polymerizable monomers and low filler content, optimized for efficient curing at wavelengths of 385 nm or less, ensuring improved polymerization kinetics and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If phosphine oxide-based initiators (BAPO, TPO) are used, then polymerization rate is improved, but curing depth is limited and reproductive toxicity occurs
Solution Approach 1:
The patent extracts and removes the harmful phosphine oxide-based initiators (BAPO, TPO) from the radiation-curing composition while maintaining the polymerization rate through alternative initiator systems that do not exhibit reproductive toxicity
Solution Approach 2:
The patent replaces long-term problematic phosphine oxide initiators with alternative initiator systems that achieve similar polymerization performance without the harmful effects, effectively substituting a short-term solution that doesn't carry the same long-term health risks
2Speed
If phosphine oxide-based initiators (BAPO, TPO) are used, then polymerization rate is improved, but curing depth is shallow
Solution Approach 1:
The patent changes the chemical parameters of the initiator system by replacing phosphine oxide-based initiators with alternative initiators that have different absorption characteristics, enabling deeper light penetration and improved curing depth while maintaining adequate polymerization rate
3Strength
If high filler content is used, then mechanical properties are improved, but polymerization kinetics are hindered
Solution Approach 1:
The patent optimizes the filler content parameter to a balanced level that allows sufficient mechanical reinforcement while preventing excessive light scattering and absorption that would hinder polymerization kinetics, achieving a compromise between strength and curing speed
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 comparable or improved mechanical properties and curing efficiency, while being environmentally friendly and compatible with a wide range of 3D printers, addressing regulatory concerns and enhancing the production of dental components.
Implementation Method 1
radiation-induced polymerization of such a radiation-curing composition
Data Source
AI summary
The invention relates to a radiation-curing composition for the production of dental components using the DLP or SLA process, comprising, based on the total mass of the radiation-curing composition: i) one or more radically polymerizable monomers in a combined mass fraction of 60% or more, ii) one or more hexaarylbiimidazole compounds in a combined mass fraction in the range of 0.1 to 5%, and iii) one or more mercaptotetrazol compounds in a combined mass fraction in the range of 0.1 to 5%, wherein the combined mass fraction of fillers in the radiation-curing composition is less than 30%.