Methacrylate Dental Cement with Polyol Spacer for Easy Removal
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Solution Overview
Problem
Current temporary dental cements face issues with adhesion to tooth surfaces, difficulty in removal, poor sealing properties, and incompatibility with later used permanent resin cements, particularly those based on (meth)acrylate chemistry.
Innovation Solution
A dental cement composition comprising a resin matrix with a high molecular weight (meth)acrylate component, a polyol spacer group, an acidic polymerizable component, a non-acidic polymerizable component, filler, and an initiator system, which provides adequate adhesion, flexibility, and easy removal without leaving residues on the tooth surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If eugenol based temporary cements are used to achieve adequate adhesion to tooth surfaces, then adhesion is improved, but unpleasant smell and inhibition of curing reaction of permanent resin cements occur
Solution Approach 1:
The patent removes eugenol from the temporary cement formulation while maintaining adequate adhesion through alternative (meth)acrylate-based chemistry. This extraction of the problematic substance eliminates the unpleasant smell and curing inhibition issues while preserving the essential adhesion function through different chemical mechanisms.
Solution Approach 2:
The patent changes the chemical composition parameters by using (meth)acrylate-based temporary cements with specific molecular weights and functional groups. This parameter change from eugenol-based to (meth)acrylate-based chemistry fundamentally alters the chemical properties, eliminating the harmful effects while maintaining adhesion through different chemical pathways.
2Object-generated harmful factors
If eugenol free and (meth)acrylate-based temporary cements are used to avoid unpleasant smell and curing inhibition, then harmful factors are reduced, but non-defined fracture pattern and cement residues on tooth surface occur
Solution Approach 1:
The patent applies local quality by creating distinct fracture patterns through controlled cement weakness at the restoration-cement interface while maintaining strength at the tooth-cement interface. This localized differentiation ensures that during removal, the cement fractures predictably at the restoration interface, leaving minimal residues on the tooth surface while still providing adequate adhesion during service.
Solution Approach 2:
The patent modifies the fracture behavior by controlling the cement's mechanical properties to create a defined, predictable fracture pattern rather than random fragmentation. This controlled curvature in the stress distribution allows the cement to fail in a predictable manner that facilitates easy removal and cleaning.
3Ease of operation
If (meth)acrylate based temporary cements are used to achieve easy removal, then removal is simplified, but poor sealing properties allowing contaminates to infiltrate occur
Solution Approach 1:
The patent optimizes the molecular weight parameters of the (meth)acrylate components and the ratio of acidic to non-acidic polymerizable components to achieve a balance between sealing properties and removability. By carefully controlling these parameters, the cement forms a reliable seal during the temporary restoration period while maintaining the ability to be removed without excessive residues.
Solution Approach 2:
The patent uses a composite formulation combining acidic polymerizable components, non-acidic polymerizable components, and specific fillers to achieve both good sealing properties and ease of removal. The composite nature of the material allows different components to contribute different functions: acidic components provide adhesion and sealing, while the overall formulation enables controlled removal.
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 dental cement composition ensures easy removal of temporary restorations, reduces the risk of fracturing during removal, maintains good sealing properties, and minimizes incompatibility with permanent cements, thus simplifying the cleaning process and ensuring successful permanent cementation.
Implementation Method 1
a (meth)acrylate component comprising a polyol spacer group between two (meth)acrylate moieties... an initiator system
Data Source
AI summary
The invention relates to a dental cement composition comprising a resin matrix comprising a (meth)acrylate component comprising at least two (meth)acrylate moieties, a polyol spacer group between the at least two (meth)acrylate moieties, the polyols spacer group having a molecular weight Mw of at least 3,000 g/mol, an acidic polymerizable component, preferably an acidic (meth)acrylate component, a non-acidic polymerizable component having a molecular weight Mw below 1,000 g/mol, preferably a non-acidic (meth)acrylate component, filler, an initiator system, optionally additives. The invention also relates to a kit of parts comprising the dental cement composition, a dental crown or a curable dental composition for producing a temporary dental restoration being different from the dental cement composition. The dental cement composition is intended for use in a process of temporarily restoring a dental situation in a mouth of a patient.