Color Stability of Dental Materials and Artificial Gums
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Web: standard-groups.com
Application
The applications of color stability testers for dental materials are mainly reflected in the following aspects:
Quality Control: Helping manufacturers screen materials with resistant color changes and improve product durability.
Clinical Decision Making: Assisting dentists in selecting aesthetically pleasing and durable restorative materials, reducing revision rates.
Compliance and Certification: Meeting the testing requirements of industry standards such as YY/T 0631-2008.
These testers assess the color changes of dental materials under simulated environmental conditions, such as light, temperature, and humidity. During the test, the dental material sample is placed in the tester and exposed to predetermined environmental conditions. The tester records the initial color of the sample and remeasures the color at certain time intervals. By comparing the initial color and the subsequent measured color, the color stability of the dental material can be evaluated.
Standards
YY0270.1-2011:Dentistry - Base polymers - Part 1: Denture base polymers
YY/T0631-2008:Dental materials - Determination of colour stability
ASTM C1442:Standard Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus
ASTM C1501:Standard Test Method for Color Stability of Building Construction Sealants as Determined by Laboratory Accelerated Weathering Procedures
ASTM D3424:Standard Practice for Evaluating the Relative Lightfastness and Weatherability of Printed Matter
ASTM D5071:Standard Practice for Exposure of Photodegradable Plastics in a Xenon Arc Apparatus
ASTM D6695:Standard Practice for Xenon-Arc Exposures of Paint and Related Coatings
ASTM G151:Standard Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources
ASTM G155:Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials
COLIPA in-vitro UVA (2011):Method for in vitro determination of UVA protection
EPA/ASTM E896:Standard Test Method for Conducting Aqueous Direct Photolysis Tests
GB/T 8427:Textiles - Tests for color fastness - Color fastness to artificial light: Xenon arc fading lamp test
GB/T 16422:Plastics -- Methods of exposure to laboratory light sources -Part 2: Xenon-arc lamps
ICH Q1B:Q1B Photostability Testing of New Drug Substances and Products
ICH Q5C:Stability testing of Biotechnological / Biological products
ISO 4049:Dentistry -- Polymer-based restorative materials
ISO 7491:Dental materials -- Determination of colour stability
ISO 4892-1:Plastics - Methods of exposure to laboratory light sources - Part 1: General guidance
ISO 4892-2:Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc sources
Feature
The dental material color stability tester has the following features:
Simulated Environmental Conditions: By simulating the light, temperature, and humidity conditions of the oral cavity, the sample undergoes accelerated aging treatment, and its color change is measured periodically to evaluate the material's color stability.
Ease of Operation: The instrument is user-friendly, easy to operate, and convenient to maintain.
High Sensitivity: Color change is measured using spectrophotometry, with repeatability accuracy reaching ΔE*ab ≤ 0.015. ensuring sensitive detection of color changes.
Environmental Stress Simulation: By setting specific periods (e.g., several hours to several days), changes in material color stability are observed.
Color Stability Evaluation Indicators: Auxiliary parameters include yellowness index (YI) and whiteness index (WI), used to quantify specific color shifts.
These features make the dental material color stability tester of significant application value in the research, development, production, and clinical application of dental materials.
Technical parameter
| Project | Details |
|---|---|
| Control System | PLC |
| Operation Interface | Color touch screen with Chinese-English switching |
| Light Source | Illuminance of 150.000 lx with an accuracy deviation not exceeding 10% |
| Color Temperature Range | 5000K - 10000K |
| Filter | Light transmittance greater than 90% |
| Test Chamber | Water temperature range: 0 - 99°C; Test temperature: 37°C; Adjustable water temperature with temperature display |
| Clamp | 304 stainless steel clamp with an outer diameter of 50MM and a thickness of 0.5MM |
| Polyurethane Film | Thickness ranging from 50μm to 0.5MM |
| Built-in Dial Indicator of the Equipment | Range: 0 - 25.5MM; Precision: 0.01MM |
| Standard | 15L constant-temperature tank with a temperature range of 0 - 99°C |
Accessoriess
The main accessories of a dental material color stability tester include the following, each playing a crucial role in the testing process:
Sample clamp: Typically made of 304 stainless steel, it can hold samples with a diameter of 50mm, ensuring stable fixation during testing.
Filter: A standard ultraviolet filter has a filtration efficiency of less than 1% for light wavelengths below 300nm and a transmittance of more than 90% for light wavelengths above 370nm. It is used to filter out unwanted light waves, ensuring the accuracy of test results.
Xenon lamp: As the standard light source, an air-cooled, full solar spectrum long-arc xenon lamp has a color temperature in the range of 5000~10000K and a lifespan of approximately 1500 hours, providing stable and near-natural light illumination conditions for testing.
Blackboard thermometer: Used to monitor and record temperature changes during testing, ensuring the testing environment meets standard requirements.
Illuminance meter: Used to measure and adjust the illuminance received by the sample, ensuring the illuminance is within the range of 150000lx±15000lx, meeting testing standards.
Circulating water bath system: Includes a circulating water tank and water pipes, used to maintain the sample water bath temperature within the range of 37±1℃ (or 37±5℃) to simulate the oral cavity temperature environment.
Standard wrenches: Such as 17-19 size wrenches, used for installing and adjusting fasteners in the equipment.
Other accessories: Depending on the specific equipment model and configuration, may also include product certificates, instruction manuals, delivery notes, acceptance slips, and other documents, as well as auxiliary accessories such as power cords and water pipes.
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