Particle-Embedded Coating for Dental Article Cement Bonding
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Solution Overview
Problem
The fixation of non-metallic dental restorations with hydrophobic surfaces to hydrophilic tooth surfaces is challenging, requiring multiple steps and specific cements, and existing methods do not effectively enhance bonding strength.
Innovation Solution
A process involving applying a curable composition on the inner surface of a non-metallic dental article, followed by embedding particles to achieve a surface roughness of 1 to 30 µm, which is then cured, allowing for easier fixation using dental cements like glass-ionomer cements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sandblasting is used to roughen the inner surface of the dental restoration, then surface roughness is increased and bonding strength is enhanced, but the process complexity and number of steps increase
Solution Approach 1:
The patent combines the surface roughening function and the bonding enhancement function into a single integrated layer. The curable composition containing reactive particles is applied as one coating step that simultaneously provides both surface modification for roughness and chemical bonding capability, eliminating the need for separate sandblasting and cementation steps.
Solution Approach 2:
The curable composition with reactive particles is applied in advance to the inner surface of the dental restoration before cementation. This preliminary application creates a pre-modified surface that is ready for bonding, eliminating the need for on-site sandblasting or additional surface preparation steps during the dental procedure.
2Strength
If the inner surface of the dental restoration is roughened to enhance bonding, then bonding strength improves, but additional surface treatment steps are required
Solution Approach 1:
The patent merges surface roughening and bonding enhancement into a single curable composition layer that provides both functions simultaneously, eliminating the need for sequential surface treatment steps and reducing overall treatment time.
Solution Approach 2:
The curable composition serves multiple functions: it acts as a bonding agent, a surface modifier, and a roughening agent all in one application. This multi-functional approach eliminates the need for separate treatments and reduces the time required for surface preparation.
3Ease of manufacture
If resin-coated particles are used to modify the surface, then surface roughness is reduced, but this contradicts the need for high surface roughness for bonding
Solution Approach 1:
The patent changes the key parameter of particle coating from cured resin (which smooths the surface) to uncured or partially cured curable composition (which maintains surface roughness). This parameter change allows the particles to remain protruding and maintain high surface roughness while still providing bonding capability through the curable matrix.
Solution Approach 2:
The patent uses a composite material system consisting of particles embedded in a curable composition matrix. This composite structure allows the particles to maintain their rough surface topology while being held in place by the curable material, which can then bond to the dental restoration and tooth structure.
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
This process facilitates easy surface modification of non-metallic dental articles, enhancing adhesion and reducing the need for additional surface roughening steps, enabling robust fixation to tooth surfaces with various dental cements.
Implementation Method 1
curing the applied curable composition
Data Source
Figure 1~2
AI summary
The invention relates to a process of producing a surface-modified non-metallic dental article, the process comprising the steps of providing a non-metallic dental article having an outer and an inner surface, applying a curable composition on the inner surface of the dental article (to form a layer of the curable composition on the inner surface), applying particles on the curable composition located on the inner surface of the dental article to achieve a surface roughness Ra of 1 to 30 µm, curing the applied curable composition, the chemical composition of the curable composition being different from the chemical composition of the dental article. The invention also relates to a surface-modified non-metallic dental article obtained or obtainable by such a process and a kit of parts comprising such a surface-modified non-metallic dental article and a dental cement.