ISO 6872-2024 PDF

Full title and description

St ISO 6872-2024 — Dentistry — Ceramic materials. This International Standard specifies requirements, recommendations and the corresponding test methods for dental ceramic materials intended for fixed all-ceramic and metal‑ceramic restorations and prostheses.

Abstract

ISO 6872:2024 (5th edition) defines types and classes of dental ceramics, sets material and processing requirements (uniformity, freedom from extraneous materials, mixing/condensation behaviour, shrinkage control), and specifies normative test methods including flexural strength (three‑point, four‑point and piston‑on‑three‑ball biaxial tests), linear thermal expansion, glass transition temperature, chemical solubility and radioactivity assessment. Informative annexes cover fracture toughness, Weibull statistics and a new protocol for hydrothermal stability testing of yttria‑stabilized tetragonal zirconia (Y‑TZP).

General information

• Status: Published.
• Publication date: August 2024 (5th edition).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 11.060.10 (Dental materials).
• Edition / version: Edition 5 (2024).
• Number of pages: 31 (ISO published document).

Scope

ISO 6872:2024 applies to ceramic materials used for fixed all‑ceramic and metal‑ceramic dental restorations and prostheses. It covers material classification (types and clinical classes), sampling and specimen preparation for testing, prescriptive test methods for mechanical, thermal and chemical properties, and information and labelling requirements that manufacturers must supply. The standard is intended to support product development, quality control, conformity assessment and safe clinical use.

Key topics and requirements

• Classification of ceramic materials by type (Type I — powder/liquid systems; Type II — factory‑processed materials) and by clinical class based on minimum flexural strength and intended clinical use.
• Mechanical test methods: three‑point and four‑point bending and biaxial (piston‑on‑three‑ball) flexural strength procedures and reporting, plus informative guidance on fracture toughness (Annex A) and Weibull statistics (Annex B).
• Hydrothermal stability protocol (new Annex C) for yttria‑stabilized tetragonal zirconia (Y‑TZP) to assess low‑temperature degradation and aging behaviour.
• Thermal properties: measurement and tolerances for linear coefficient of thermal expansion and glass transition temperature (limits on deviation from manufacturer values).
• Chemical requirements and tests: chemical solubility limits, radioactivity limits and criteria for freedom from extraneous materials.
• Sampling, specimen preparation and processing instructions for Type I and Type II ceramics, including mixing, forming and firing protocols to ensure repeatable test results.
• Information and labelling: required manufacturer data (composition, sintering/shrinkage factors, recommended processing parameters, intended clinical indications and classification).
• Typical flexural‑strength class thresholds referenced historically and retained as guidance (examples: ~50 MPa, 100 MPa, 300 MPa, 500 MPa, 800 MPa for progressively demanding clinical indications). Users should check the standard text for precise class definitions and application notes.

Typical use and users

Intended users include dental materials manufacturers (powders, blocks, pastes, CAD/CAM blanks), dental laboratories and technicians (material selection and process control), accredited testing laboratories (mechanical, thermal and chemical testing), regulators and conformity assessment bodies, and researchers studying ceramic performance and aging (including Y‑TZP hydrothermal stability). The standard supports product specifications, regulatory technical files and comparative performance assessment.

Related standards

ISO 6872 is used together with other dentistry and biocompatibility standards; commonly referenced related documents include ISO 1942 (dentistry vocabulary), ISO 10993‑1 and ISO 7405 (biological evaluation/biocompatibility guidance), ISO 9693 (compatibility testing for metal‑ceramic and ceramic‑ceramic systems — see ISO 6872 for ceramic requirements), and ISO 22674 (metallic dental materials) as relevant to combined systems and regulatory submissions. Users should consult the normative references listed in ISO 6872:2024 for the complete set.

Keywords

Dental ceramics; ceramic materials; dental zirconia; Y‑TZP; biaxial flexural strength; three‑point bending; fracture toughness; Weibull statistics; hydrothermal stability; chemical solubility; thermal expansion; ISO 6872:2024.

FAQ

Q: What is this standard?

A: ISO 6872:2024 is the International Standard that specifies requirements and standardized test methods for dental ceramic materials used in fixed all‑ceramic and metal‑ceramic restorations and prostheses. It is the fifth edition, published in August 2024.

Q: What does it cover?

A: It covers material classification (types and strength‑based clinical classes), sampling and specimen preparation, prescriptive mechanical/thermal/chemical test methods (flexural strength, dilatometry, glass transition, chemical solubility, radioactivity), informative annexes on fracture toughness and Weibull statistics, and a new Annex C protocol for assessing the hydrothermal stability of Y‑TZP.

Q: Who typically uses it?

A: Manufacturers, dental laboratories, testing laboratories, regulators and researchers use ISO 6872 to specify material performance, run standardized tests, prepare regulatory technical files and compare materials for clinical applications.

Q: Is it current or superseded?

A: ISO 6872:2024 is the current published edition (5th edition). It cancels and replaces ISO 6872:2015 and the 2018 amendment; users should adopt the 2024 text for up‑to‑date test protocols and the added Y‑TZP hydrothermal stability guidance.

Q: Is it part of a series?

A: ISO 6872 sits within the ISO/TC 106 dentistry standards family and is used alongside other dental material and test standards (for vocabulary, biocompatibility and compatibility testing), e.g. ISO 1942, ISO 10993‑1, ISO 7405, ISO 9693 and ISO 22674.

Q: What are the key keywords?

A: Key keywords include dental ceramic, ceramic materials, zirconia, Y‑TZP, flexural strength, biaxial flexure, fracture toughness, Weibull statistics, hydrothermal stability, chemical solubility and thermal expansion.