Cervical Matrix with Light-Absorbing Outer Layer
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Solution Overview
Problem
Existing cervical matrices do not effectively improve the curing time for chemically-cured dental restoration materials used in Class V caries lesions, which can lead to prolonged restoration times and potential distortion of the restorative material.
Innovation Solution
A universal cervical matrix with a concave elastic lamina comprising an outer layer that absorbs ultraviolet and visible light and an inner non-stick layer, which prevents adhesion to the restoration material, is used to accelerate the curing process by transferring heat energy to the restoration site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a traditional transparent cervical matrix is used, then light transmission for light-cured resins is enabled, but the curing time for chemically-cured restorations remains prolonged
Solution Approach 1:
The matrix combines a transparent outer layer for light transmission with an inner layer containing light-absorbing particles (carbon black, graphite, or metal oxides). This composite structure allows the matrix to simultaneously transmit light for light-cured resins while absorbing and converting light energy to heat for accelerating chemically-cured restorations, resolving the time loss without compromising productivity
Solution Approach 2:
The invention changes the optical and thermal parameters of the matrix by incorporating light-absorbing particles in the inner layer. These particles absorb ultraviolet and visible light and convert it to thermal energy, raising the temperature at the restoration site. This parameter change (temperature increase) accelerates the chemical curing process, reducing curing time from several minutes to as little as twenty seconds
2Loss of time
If the matrix is removed early to complete restoration, then time is saved, but the restorative material becomes distorted
Solution Approach 1:
The light-absorbing inner layer converts light energy to heat, rapidly increasing the temperature at the restoration site. This thermal acceleration allows the chemically-cured resin to reach full cure strength much faster, enabling the matrix to be removed after only twenty seconds without causing distortion, thus saving time while maintaining manufacturing precision
Solution Approach 2:
The invention replaces the traditional mechanical/waiting-based curing process with a photothermal acceleration mechanism. Instead of relying on slow ambient temperature chemical curing, the matrix actively generates heat through light absorption to accelerate the curing reaction, enabling early matrix removal without compromising restoration accuracy
3Manufacturing precision
If a non-stick inner layer is added to prevent adhesion, then material distortion is prevented, but device complexity increases
Solution Approach 1:
The matrix uses a composite structure with an outer transparent layer and an inner layer containing light-absorbing particles embedded in a matrix material. The inner layer's composition (carbon black, graphite, or metal oxide particles) provides both the photothermal conversion function and the non-stick property, achieving restoration integrity without excessive device complexity
Solution Approach 2:
The inner layer serves multiple functions simultaneously: it absorbs and converts light to heat for curing acceleration, provides a non-stick surface to prevent restoration material adhesion and distortion, and maintains structural integrity of the matrix. This multi-functionality achieves restoration integrity without significantly increasing device complexity
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 matrix significantly reduces the curing time of chemically-cured restorations from several minutes to as little as twenty seconds, allowing for earlier removal and completion of the restoration without distortion.
Implementation Method 1
an outer layer is adapted to absorb ultraviolet and visible light
Implementation Method 2
transferring heat energy to the restoration site
Implementation Method 3
an inner layer comprises a material which does not adhere to the dental restoration material
Data Source
AI summary
A universal cervical matrix for dental use comprising a lamina having at least an outer layer and an inner layer, the inner layer comprising a non-stick surface to prevent adhering to a chemically-cured dental restoration material, and the outer layer comprising an energy-absorbing material. The energy-absorbing material absorbs energy output from a dental curing light and provides heat to the dental restoration material, thereby increasing curing rate.