Dental Cement Composition Reinforced with Polymer Network
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Solution Overview
Problem
Conventional glass ionomer dental cements have low flexural strength and are prone to bulk fracture due to brittleness, despite offering advantages like minimal exothermic reaction, no shrinkage, and good adhesion to tooth structure.
Innovation Solution
A dental cement composition incorporating a water-soluble polymerizable compound with a specific formula (AXn) and a particulate filler reactive with a polyacid, which improves mechanical properties through hydrolysis stability and covalent bonding, reducing brittleness and enhancing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional glass ionomer cements are used, then advantages such as minimal exothermic reaction, no shrinkage, and good adhesion to tooth structure are maintained, but flexural strength is low and the material is prone to bulk fracture due to brittleness
Solution Approach 1:
The patent combines glass ionomer cement with poly(N-vinylcaprolactam) polymer to create a composite material system. The polymer forms a three-dimensional network structure that reinforces the traditional glass ionomer matrix, providing improved flexural strength and fracture toughness while preserving the adhesive properties and minimal shrinkage characteristics of the original cement
2Strength
If polyacrylic acid or copolymers are used as the base polymer, then good adhesion to tooth structure and fluoride release are achieved, but the mechanical strength and resistance to abrasion remain insufficient
Solution Approach 1:
The invention creates a composite system where poly(N-vinylcaprolactam) polymer is integrated with the polyacrylic acid-based glass ionomer cement. This composite structure provides enhanced mechanical strength and abrasion resistance through the polymer's three-dimensional network, while the glass ionomer component maintains fluoride release and adhesion properties
3Strength
If amino acids or water soluble copolymers are added to improve mechanical properties, then flexural strength increases, but the complexity of the composition and setting mechanism increases
Solution Approach 1:
The patent modifies the polymer structure by incorporating poly(N-vinylcaprolactam) with specific molecular weight characteristics (number average molecular weight of 10,000 to 1,000,000) to achieve improved mechanical properties. This parameter-based approach allows for controlled enhancement of strength without significantly complicating the overall composition or setting mechanism
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 mechanical properties, including increased flexural strength and fracture toughness, while maintaining minimal exothermic reaction, no shrinkage, and high dimensional stability, and good adhesion to tooth structure.
Implementation Method 1
hydrolysis stability during storage and after curing
Implementation Method 2
water-soluble polymerizable compound of the following formula (1) AX n wherein A is a linker group containing at least n nitrogen atoms and one or more acidic groups, X are moieties containing a polymerizable double bond
Implementation Method 3
the poly(alkenoic acid) attacks the glass powder whereby metal ions such as calcium, aluminum and strontium are released under formation of intra- and intermolecular salt bridges which crosslink the composition
Data Source
AI summary
Dental cement composition comprising (i) a particulate filler reactive with a polyacid in a cement reaction; (ii) a water-soluble polymerizable compound of the following formula (1), €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ AX n €ƒ€ƒ€ƒ€ƒ€ƒ(1) wherein A is a linker group containing at least n nitrogen atoms and optionally one or more acidic groups, X are moieties containing a polymerizable double bond and forming an amide bond with a nitrogen atom of A, which X may be the same or different and are represented by the following formula (2) wherein R 1 and R 2 are independent from each other and represent a hydrogen atom, a C 1-6 alkyl group or a group -(CH 2 ) m -COOM, wherein M is a hydrogen atom or a metal atom, and m is an integer of from 0 to 6, L is a bond or a C 1-6 alkylene group; and n is an integer of at least 1; provided that at least one X cannot be a (meth)acryl group; and (iii) an initiator system; optionally a polyacidic polymer having polymerizable double bonds; and optionally water.