Dental Adhesive Kit Segmentation for Photopolymerization Stability
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Solution Overview
Problem
Dental adhesive material kits face challenges with ease of handling and stability of paste properties during long storage, as well as a decrease in photocurability and bond strength due to degradation of photopolymerization initiators when coexisting with basic fillers and peroxide.
Innovation Solution
A dental adhesive material kit comprising an aqueous adhesive composition with a radical polymerizable monomer containing an acidic group, a polymerization accelerator, and water, combined with a curable composition containing a hydrophilic and hydrophobic radical polymerizable monomer, a chemical and photopolymerization initiator, and a filler treated with a silane coupling agent and organosilazane, which maintains stability and adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a photopolymerization initiator is coexistent with basic fillers and peroxide in the dental composition, then the adhesive property and mechanical strength are improved, but the photocurability and bond strength decrease due to degradation of the photopolymerization initiator
Solution Approach 1:
The dental composition is divided into two separate packs: Pack A contains the photopolymerization initiator while Pack B contains the basic filler and peroxide. This segmentation prevents the photopolymerization initiator from degrading through contact with basic fillers and peroxide, maintaining photocurability stability while still enabling strong bonding when the packs are mixed and applied.
2Strength
If a dual-cure type dental cement is used to achieve high bond strength and avoid detachment of restorative filling material, then the adhesive property is improved, but the ease of operation deteriorates due to immediate chemical polymerization starting after mixing
Solution Approach 1:
The system provides dynamic control over polymerization timing through a dual-cure mechanism with conditional activation. Initially, the composition remains in a non-polymerized state allowing positioning adjustments. When light is applied, photopolymerization begins providing immediate stabilization. Chemical polymerization then progresses to complete curing, offering flexibility in timing while ensuring final bond strength.
3Ease of operation
If a photopolymerization-type dental cement is used to afford enough time for the procedure, then the ease of operation is improved, but the reliability deteriorates due to risk of restorative filling material detachment from concentrated strain and stress
Solution Approach 1:
The dual-cure system ensures continuous polymerization action throughout the procedure. Photopolymerization begins immediately upon light application to provide initial stabilization and prevent material detachment. Chemical polymerization continues in the background to achieve complete curing and maximum bond durability, ensuring both procedural ease and long-term reliability.
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 kit exhibits high adhesive properties to tooth structures and dental prostheses with improved mechanical strength and storage stability, ensuring minimal changes in paste properties over time, and provides sufficient photocurability for effective bonding.
Implementation Method 1
a filler treated with a surface treatment agent comprising a silane coupling agent and an organosilazane
Implementation Method 2
The surface treatment improves spreadability by improving the affinity between the filler and a radical polymerizable monomer
Implementation Method 3
a curable dental composition containing a hydrophilic radical polymerizable monomer, a hydrophobic radical polymerizable monomer, a chemical polymerization initiator, a photopolymerization initiator
Implementation Method 4
a paste-like polymerizable and curable dental composition comprised of components such as a radical polymerizable monomer
Implementation Method 5
The primer contains components such as a radical polymerizable monomer containing an acidic group, and improves the adhesive property of a dental cement to a tooth structure by altering the surface of the tooth structure
Data Source
AI summary
The present invention provides a dental adhesive material kit that exhibits high adhesive property to tooth structure and dental prosthesis through photopolymerization while maintaining good ease of handling with the paste properties that undergo little change during long storage. The present invention relates to a dental adhesive material kit comprising: an aqueous adhesive dental composition (X) comprising a radical polymerizable monomer (a) containing an acidic group, a polymerization accelerator (b), water (c), and a radical polymerizable monomer (d) containing no acidic group; and a curable dental composition (Y) comprising a hydrophilic radical polymerizable monomer (d-1) containing no acidic group, a hydrophobic radical polymerizable monomer (d-2) containing no acidic group, a chemical polymerization initiator (e), a photopolymerization initiator (f), and a filler (g), the filler (g) being a filler treated with a surface treatment agent, and having an average particle diameter of 0.01 to 50.0 µm, the surface treatment agent comprising a silane coupling agent (A) represented by general formula [1], and an organosilazane (B) represented by general formula [2].