Dental Facing Adhesive Composition for Gap-Free Bonding
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Solution Overview
Problem
Conventional methods for attaching dental facings to support structures often result in unwanted bite enlargements and require manual handling, with existing compositions solidifying prematurely, leading to gaps and defects in the final restoration.
Innovation Solution
A composition comprising water, glass or glass ceramic material, and a rheological modifier with a molecular weight above 500,000, which can be applied in thin layers, providing sufficient viscosity and wetting properties to attach dental facings to support structures without solidifying prematurely, thus avoiding gaps and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compositions are used for attaching dental facings, then the attachment process can be performed, but the composition solidifies prematurely causing gaps and defects
Solution Approach 1:
The patent modifies the rheological properties of the composition by using a specific viscosity range (10-1000 mPas at 23°C, shear rate 50 s⁻¹) and controlling the water content (10-55 wt.-%) to extend the working time while maintaining proper flow characteristics during application and bonding processes
2Ease of manufacture
If manual handling methods are used, then dental facings can be attached, but bite enlargements occur
Solution Approach 1:
The patent replaces manual mechanical handling with an automated slurry application system that deposits a controlled thin layer of composition, eliminating the need for distance holders and ensuring precise fit without bite enlargements
3Reliability
If thick layers of composition are applied, then coverage is sufficient, but gaps and bubbles form at the interface
Solution Approach 1:
The patent optimizes the composition's flow and viscosity parameters to enable application in thin layers (5-50 μm) that provide sufficient coverage and bonding while preventing trapped air and ensuring complete interface contact between facing and support structure
4Shape
If the composition has high viscosity, then it maintains shape, but it cannot be applied in thin uniform layers
Solution Approach 1:
The patent establishes an optimal viscosity range (10-1000 mPas) that balances flowability for thin layer application with sufficient shape retention, using rheological modifiers to achieve shear-thinning behavior that facilitates spreading while maintaining layer integrity
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 allows for the creation of dental restorations with no gaps or bubbles at the interface, offering improved integrity and aesthetic quality by enabling thin layer application and correction of mating material, reducing the need for distance holders and enhancing the overall stability of the dental restoration.
Implementation Method 1
a rheological modifier with a molecular weight above about 500,000
Implementation Method 2
providing sufficient viscosity and wetting properties to attach dental facings to support structures
Data Source
AI summary
The present invention relates to a composition for attaching a dental facing on a dental support structure comprising water, a glass and/or glass ceramic material, a rheological modifier with a molecular weight above about 500,000. The invention also relates to a process comprising the steps: providing a dental facing precursor and a dental support structure, both having an upper and a lower surface, attaching the dental facing precursor with its lower surface to the upper surface of the dental support structure, comprising the step of placing a mating composition between the lower surface of the dental facing precursor and the upper surface of the dental support structure and to the use of the inventive composition for producing dental restorations.