Dental Composite Resin Layer Switching for Broad Shade Matching
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Solution Overview
Problem
Conventional dental composite resin kits require multiple shades to achieve aesthetic filling and restoration, leading to increased operator burden due to the need for preparing and using many composite resins and materials, and there is a lack of flexibility in switching between upper and lower layers.
Innovation Solution
A dental composite resin kit comprising two dental composite resins with specific shade relationships, including a contrast ratio difference of 0.3 or less and lightness and chroma differences satisfying certain formulas, allowing for aesthetic filling and restoration across various shades by switching layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple composite resins with different shades are prepared to achieve aesthetic filling and restoration, then the ability to match various tooth shades is improved, but the operator burden and complexity of the kit increases
Solution Approach 1:
The patent makes each composite resin universally applicable to multiple positions (upper layer, lower layer, or both) by defining specific contrast ratio relationships between resins. This allows a reduced set of resins to function as multiple specialized resins would have, decreasing kit complexity while maintaining shade matching capability across different tooth types
Solution Approach 2:
The patent changes the parameter relationships between composite resins by specifying that the contrast ratio difference between resins must be 0.3 or less, and defining specific lightness and chroma differences. This parameter control enables flexible switching between upper and lower layer applications, allowing the same resins to adapt to various tooth shades without requiring separate specialized resins for each position
2Adaptability or versatility
If many composite resins and materials are used in the kit, then the ability to perform aesthetic filling and restoration is improved, but the operator burden increases
Solution Approach 1:
Each composite resin in the kit is designed to be multi-functional, capable of being applied to either upper or lower layers depending on the tooth shade requirements. This universality reduces the number of different resin types the operator must handle and select from, thereby reducing operator burden while maintaining comprehensive aesthetic restoration capability
Solution Approach 2:
The patent introduces dynamic flexibility by allowing the operator to switch the application position (upper or lower layer) of each composite resin based on the specific tooth shade being treated. This dynamic adaptability eliminates the need for fixed assignments of resins to specific positions, simplifying the operator's workflow while preserving aesthetic restoration versatility
3Device complexity
If the kit is designed with fixed upper and lower layer assignments, then the structure is simplified, but the flexibility to switch between layers is lost
Solution Approach 1:
The patent creates a dynamic system where the functional assignment of each composite resin (whether it serves as upper layer or lower layer material) can be changed based on clinical needs. The specific contrast ratio relationships defined in the patent enable this flexibility while maintaining a relatively simple kit structure with only two composite resins
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 kit reduces the number of resins needed while enabling a wide range of shades and easy color matching, thereby reducing operator burden and improving aesthetic dental restorations.
Implementation Method 1
a photopolymerization initiator and a polymerizable monomer, wherein the photopolymerization initiator initiates photopolymerization of the polymerizable monomer when irradiated with light having a maximum wavelength of 450 nm or less
Data Source
AI summary
To provide a dental composite resin kit which can reproduce a wide range of shades with a relatively small number of dental composite resins used in combination when performing aesthetic filling and restoration on teeth of various shades.To provide a dental composite resin kit including at least a first dental composite resin and a second dental composite resin, whereina contrast ratio of a cured body measured at a thickness of 1 mm of the first dental composite resin is 0.3 to 0.75,a contrast ratio of a cured body measured at a thickness of 1 mm of the second dental composite resin is 0.3 to 0.75,a difference in contrast ratio of a cured body between the first dental composite resin and the second dental composite resin is 0.3 or less, andwhen it is defined that (L1*, a1*, b1*) is a value of a color tone in a cured body having a thickness of 1 mm of the first dental composite resin in the L*a*b* space measured in the white background and (L2*, a2*, b2*) is a value of a color tone in a cured body having a thickness of 1 mm of the second dental composite resin in the L*a*b* space measured in the white background,the color difference ΔE expressed by the following formula (1) is 2 or more.ΔE={(L1*-L2*)2+(a1*-a2*)2+(b1*-b2*)2}1/2Formula (1)