Dental Material Color Stability Tester

The Dentistry Base Polymer Search Stability tester evaluates color stability of dental base polymers (used in restorations like dentures) under varied conditions (light, temp, humidity). It records initial and subsequent color of samples to assess changes. This helps dentists and technicians choose better materials, improving repair effectiveness and durability, and aids manufacturers in enhancing product performance.

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

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.

FAQ

(1)What materials can be evaluated with this tester?

This tester is mainly used for dental restorative materials, including denture base polymers, resin materials, composite materials, and dental ceramics. It helps evaluate whether materials maintain stable color performance after exposure to simulated environmental conditions, supporting product development, quality control, and clinical material selection.

(2)How is color stability determined during testing?

Color stability is evaluated by comparing the color values of a specimen before and after exposure. The system uses spectrophotometric measurement to calculate color differences, such as ΔE values, allowing users to quantify changes caused by light, temperature, and humidity conditions.

(3)Why is a xenon lamp used in this equipment?

The xenon lamp provides a light spectrum close to natural sunlight, making it suitable for accelerated aging evaluation. It helps simulate long-term light exposure conditions and allows researchers to observe potential color changes of dental materials within a shorter testing period.

(4)What environmental conditions can be controlled during testing?

The equipment can control important test conditions including light intensity and water bath temperature. The temperature system can maintain conditions around 37°C to simulate oral temperature environments, while the controlled illumination system provides stable exposure conditions.

(5)How are test results managed and analyzed?

The tester records color change data during the test process, allowing users to compare initial and final measurements. The obtained results can be analyzed to evaluate material color stability, helping manufacturers and laboratories make decisions regarding material performance and quality improvement.