Polymerizable Polyacidic Dental Cement for Flexural Strength
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Solution Overview
Problem
Conventional glass ionomer cements exhibit low flexural strength and brittleness, limiting their use in posterior teeth restorations due to their mechanical properties, and the introduction of polymerizable moieties often compromises the water solubility of the polymer.
Innovation Solution
A dental cement composition featuring a polymerizable polyacidic polymer with specific repeating units in the polymer backbone, which is prepared through copolymerization and reaction with HXY, and used in a cement reaction with reactive particulate glass to enhance mechanical properties while maintaining water solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymerizable moieties are introduced to improve mechanical properties, then flexural strength and fracture toughness are improved, but water solubility of the polymer is compromised
Solution Approach 1:
The patent applies parameter changes by carefully controlling the degree of substitution of polymerizable groups on the acidic moieties. By limiting the substitution to specific ranges (e.g., 1-50% of acidic groups modified), the patent optimizes the balance between mechanical properties and water solubility. The specific structural parameters of the repeating units (formula I with controlled m and n values) are adjusted to achieve the desired property balance.
Solution Approach 2:
The patent creates a composite polymer structure combining polyacidic chains with grafted polymerizable moieties. This composite approach allows the polyacidic backbone to maintain water solubility while the grafted polymerizable groups provide enhanced mechanical strength when cured. The dual-function structure integrates the benefits of both hydrophilic and mechanically robust components.
2Strength
If polymerizable moieties are introduced to improve mechanical properties, then fracture toughness is improved, but brittleness increases
Solution Approach 1:
The patent controls brittleness by adjusting the substitution degree of polymerizable groups and the specific structure of repeating units. By optimizing parameters such as the ratio of acidic to polymerizable groups (formula I with controlled m and n), the patent achieves improved fracture toughness while minimizing brittleness. The controlled partial substitution prevents excessive crosslinking that would lead to brittle behavior.
3Stability of the object's composition
If conventional glass ionomer cement is used, then water solubility is maintained, but flexural strength and mechanical properties remain low
Solution Approach 1:
The patent creates a composite polymer structure combining polyacidic chains with grafted polymerizable moieties. This composite approach allows the polyacidic backbone to maintain water solubility while the grafted polymerizable groups provide enhanced mechanical strength when cured. The dual-function structure integrates the benefits of both hydrophilic and mechanically robust components.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the degree of substitution of polymerizable groups on the acidic moieties. By limiting the substitution to specific ranges (e.g., 1-50% of acidic groups modified), the patent optimizes the balance between mechanical properties and water solubility. The specific structural parameters of the repeating units (formula I with controlled m and n values) are adjusted to achieve the desired property balance.
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 solution provides improved flexural strength and fracture toughness to the dental cement, allowing for its use in stress-bearing areas without compromising water solubility, thus addressing the limitations of conventional glass ionomers.
Implementation Method 1
copolymerizing a mixture containing acrylic acid and one or more monomers selected from the group consisting of maleic anhydride and itaconic anhydride
Implementation Method 2
used in a cement reaction with reactive particulate glass to enhance mechanical properties
Implementation Method 3
a dental cement composition comprising a polymerizable polyacidic polymer having repeating units in the polymer backbone
Data Source
AI summary
A dental cement hardened by a cement reaction involving the specific polymerizable polyacidic polymer and optionally additional crosslinkable groups, has reduced shrinkage and improved mechanical properties, in particular with regard to flexural strength and fracture toughness. Moreover, the specific polymerizable polyacidic polymer of the present invention contains a high number of acidic groups which is not reduced by the presence of polymerizable moieties, whereby water solubility of the uncured polymer is not impaired by the presence of the polymerizable moieties.