SIST EN ISO 7491:2001
(Main)Dental materials - Determination of colour stability (ISO 7491:2000)
Dental materials - Determination of colour stability (ISO 7491:2000)
Zahnärztliche Werkstoffe - Bestimmung der Farbbeständigkeit (ISO 7491:2000)
Diese Internationale Norm legt ein Verfahren zur Bestimmung der Farbbeständigkeit von zahnärztlichen Werkstoffen fest, nachdem diese Licht und Wasser ausgesetzt waren.
Produits dentaires - Détermination de la stabilité de couleur (ISO 7491:2000)
La présente Norme internationale spécifie une méthode pour la détermination de la stabilité de couleur des produits dentaires après exposition à la lumière et à l'eau.
Dental materials - Determination of colour stability (ISO 7491:2000)
General Information
- Status
- Published
- Publication Date
- 31-Oct-2001
- Technical Committee
- VAZ - Healthcare
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Nov-2001
- Due Date
- 01-Nov-2001
- Completion Date
- 01-Nov-2001
Relations
- Effective Date
- 01-Nov-2001
Overview
SIST EN ISO 7491:2001 (ISO 7491:2000) specifies a standardized method to determine the colour stability of dental materials after exposure to light and water. Colour stability is a critical property for restorative and prosthodontic materials where long-term aesthetics and clinical acceptance depend on resistance to fading or discoloration.
This standard is used in conjunction with material-specific standards that define specimen preparation and references. It describes the test environment, radiation source, specimen mounting, exposure duration and visual comparison procedure.
Key Topics
- Radiation source: A xenon medium-pressure lamp with colour temperature 5 000 K to 10 000 K and an illuminance at the specimen of 150 000 lx (deviation ±10 % permitted). Equivalent light sources of comparable performance are acceptable.
- Ultraviolet filter: Borosilicate glass filter with transmittance <1% below 300 nm and >90% above 370 nm to replicate realistic daylight spectra while limiting short-wave UV.
- Water bath conditions: Circulating water (grade 2, ISO 3696) at (37 ± 5) °C with a water depth of (10 ± 5) mm above specimens to simulate oral hydration during exposure.
- Specimen holder: Opaque holder (preferably metal) for discs up to 50 mm diameter; design permits clamping or partial covering of specimens for side-by-side comparison.
- Exposure procedure: Specimens are exposed in the water bath with the UV filter in place for (24 ± 1) h to xenon irradiation. Half of each specimen is shielded so exposed and unexposed regions can be directly compared.
- Colour comparison: Visual assessment by three observers with normal colour vision (verified). Observations are made under diffuse daylight conditions or a D65-equivalent lamp, at 1 000–2 000 lx, with viewing distance 200–300 mm and exposure to the sample limited to about 2 s.
Applications
- Quality control and batch release testing of dental restorative and prosthodontic materials.
- Material selection during product development and formulation optimisation to improve long-term aesthetics.
- Comparative studies and conformity assessment for regulatory submission and certification.
- Research into ageing, pigment stability, and effects of light and water on dental polymers, composites and prosthetic materials.
Related Standards
- ISO 3696 - Water for analytical laboratory use (specifies water quality used in test).
- ISO 4892-2 - Methods of exposure to laboratory light sources - Xenon-arc sources (illuminance and lamp requirements).
- CIE Publication 15.2 - Colorimetry (D65 reference and viewing conditions).
Keywords: SIST EN ISO 7491:2001, ISO 7491, dental materials, colour stability, xenon lamp, UV filter, water bath, visual assessment, D65, quality control.
Frequently Asked Questions
SIST EN ISO 7491:2001 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Dental materials - Determination of colour stability (ISO 7491:2000)". This standard covers: La présente Norme internationale spécifie une méthode pour la détermination de la stabilité de couleur des produits dentaires après exposition à la lumière et à l'eau.
La présente Norme internationale spécifie une méthode pour la détermination de la stabilité de couleur des produits dentaires après exposition à la lumière et à l'eau.
SIST EN ISO 7491:2001 is classified under the following ICS (International Classification for Standards) categories: 11.060.10 - Dental materials. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 7491:2001 has the following relationships with other standards: It is inter standard links to SIST EN 27491:2000. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN ISO 7491:2001 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2001
1DGRPHãþD
SIST EN 27491:2000
Dental materials - Determination of colour stability (ISO 7491:2000)
Dental materials - Determination of colour stability (ISO 7491:2000)
Zahnärztliche Werkstoffe - Bestimmung der Farbbeständigkeit (ISO 7491:2000)
Produits dentaires - Détermination de la stabilité de couleur (ISO 7491:2000)
Ta slovenski standard je istoveten z: EN ISO 7491:2000
ICS:
11.060.10 =RERWHKQLþQLPDWHULDOL Dental materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 7491
Second edition
2000-09-01
Dental materials — Determination of colour
stability
Produits dentaires — Détermination de la stabilité de couleur
Reference number
ISO 7491:2000(E)
©
ISO 2000
ISO 7491:2000(E)
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ii © ISO 2000 – All rights reserved
ISO 7491:2000(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 7491 was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee
SC 2, Prosthodontic materials.
This second edition cancels and replaces the first edition (ISO 7491:1985), which has been technically revised.
ISO 7491:2000(E)
Introduction
Colour stability is an important characteristic of dental materials and it is expected that the test methods in this
International Standard will be referred to in the International Standards specifying such materials.
iv © ISO 2000 – All rights reserved
INTERNATIONAL STANDARD ISO 7491:2000(E)
Dental materials — Determination of colour stability
1 Scope
This International Standard specifies a method for the determination of the colour stability of dental materials after
exposure to light and water.
2 Normative references
The following normative documents contain provisions which,
...
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