Dental material color stability tester

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.

Test Procedures

The operation method of a dental material color stability tester includes the following steps:

Prepare the equipment and materials, including the tester, the dental material to be tested, a standard light source, and a standard color chart.

Place the dental material to be tested under the standard light source for pretreatment to simulate the lighting conditions in actual use.

Place the dental material to be tested on the sample holder of the tester and adjust the position and angle of the tester to ensure the accuracy and reliability of the test results.

Select a suitable standard color chart for comparison with the color of the dental material to be tested.

Set the test parameters, such as test time and light source type.

Start the test and record the color change data during the test.

Process and analyze the data to calculate key parameters such as the color difference value and color difference change rate of the dental material to be tested.

Compare the test results with the requirements of actual applications to evaluate the color stability performance of the dental material to be tested in actual use.

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