Overview
ISO/TS 14569-2:2001 - Dental materials: Guidance on testing of wear - Part 2: Wear by two‑ and/or three‑body contact provides guidance on laboratory methods for assessing occlusal wear of restorative materials caused by contact with antagonists (natural teeth, artificial teeth or other materials). Rather than defining a single universal test, this Technical Specification collects and describes a range of existing two‑ and three‑body wear test methods so they can be used for comparative screening of materials.
Key topics and requirements
- Scope: Tests for resistance to wear on occlusal surfaces from physiological activity (two‑ and three‑body abrasion). Excludes chemical marginal degradation, swelling, edge splintering or toothbrushing wear.
- Test methods documented: Multiple established laboratory procedures are described, including DIN, ACTA, Zürich, Alabama, Freiburg, Minnesota, OHSU and Newcastle protocols - each with specific antagonist types, media and movement regimes.
- Antagonists and media: Examples include densely sintered alumina, tooth enamel, steatite, steel and poppy seeds; media range from water to food‑particle slurries (e.g., rice/millet husks, PMMA beads).
- Measurement techniques: Gravimetric loss, profilometry or laser scanning to measure worn volume/height; software for profilometric data processing is acknowledged but not yet standardized.
- Representative test details (as examples in the text):
- Environmental control (example: DIN method carried out at 23 ± 2 °C).
- Specimen conditioning (example: specimens stored in water at 37 ± 1 °C for 7 days in the DIN method).
- Reference materials: PMMA (polymethyl methacrylate) sheets recommended as a reference for polymer-based materials; antagonists such as sintered alumina are recommended for repeatable antagonist conditions.
- Normative reference: ISO 3696 for deionized water quality.
- Terminology defined: abrasivity, abrasive wear (two‑body and three‑body), adhesive wear, attrition, corrosive wear, erosion, fatigue wear and general definition of wear.
Applications and users
- Primary use: Laboratory screening and comparative evaluation of dental restorative materials (ceramics, polymers, composites, artificial teeth) for occlusal wear behaviour.
- Typical users: dental materials manufacturers, independent testing laboratories, academic researchers in dentistry and biomaterials, regulatory bodies evaluating performance evidence, and developers of restorative products.
- Practical note: Results are valid only for the tested material–antagonist combination; laboratory wear values are indicative for clinical performance but cannot be generalized as intrinsic material constants.
Related standards
- ISO/TS 14569‑1: Wear by toothbrushing (companion part covering a different wear mechanism).
- ISO 3696: Water for analytical laboratory use - specification and test methods (normative reference used in this part).
Keywords: ISO/TS 14569-2:2001, dental materials wear testing, two-body abrasion, three-body abrasion, occlusal wear, profilometry, PMMA reference, restorative materials testing.