Overview
ISO/TR 14569-1:2007 is an International Organization for Standardization (ISO) technical report providing guidance on testing dental materials for wear caused by toothbrushing. Specifically, it addresses the wear resistance of materials used in the fabrication of artificial teeth and the veneering of crowns and bridges. This part of the series focuses exclusively on wear resulting from toothbrushing-the mechanical abrasion caused by toothbrush bristles combined with toothpaste-and aims to standardize laboratory testing methods for comparable and reliable results.
The document highlights the complexity of oral wear mechanisms and recommends evaluating each wear factor separately to better predict clinical performance. ISO/TR 14569-1:2007 replaces an earlier technical specification and forms part of a broader framework guiding wear testing for dental materials.
Key Topics
- Scope of Testing: The standard applies to artificial teeth materials and veneering of crowns/bridges, excluding chemical degradation or wear due to contact with opposing teeth.
- Test Conditions:
- Temperature controlled at 23 ± 2 °C during testing.
- Use of toothbrushes with specified stiffness (9–10 cN/mm) to simulate toothbrushing forces.
- Use of a toothpaste slurry, prepared in a defined ratio with deionized water, to simulate abrasive action.
- Test Apparatus and Materials:
- Machines with at least two test stations applying a load between 0.5 N and 2.5 N.
- Reference specimens made of standardized poly(methyl methacrylate) (PMMA) for comparative benchmark.
- Accurate analytical balances for measuring mass loss with 0.1 mg precision.
- Test Procedure:
- Conditioning specimens in water at 37 ± 1 °C for 7 days before testing.
- Pre- and post-test cleaning using ultrasonic baths.
- Measurement of mass loss and density to calculate volumetric wear.
- Result Calculation:
- Mass loss converted to volume loss using specimen density.
- Relative wear expressed as a percentage compared to reference material.
- Reporting Requirements:
- Detailed documentation including test material, reference material data, toothbrush and toothpaste specifications, measurement results, and test conditions.
Applications
ISO/TR 14569-1:2007 serves as a valuable resource for dental material manufacturers, researchers, and quality control laboratories by providing:
- A standardized method to evaluate wear resistance by toothbrushing, enabling objective comparison of dental materials.
- Support in material selection decisions for prosthodontic applications where mechanical abrasion from daily oral hygiene is a critical factor.
- A screening tool for new dental composite formulations, veneering materials, and artificial tooth materials to ensure durability under realistic oral care conditions.
- Baseline information for regulatory compliance and product claims making relating to resistance against toothbrush-induced wear.
- Enhanced understanding of how toothpaste abrasiveness and toothbrush stiffness impact material longevity, helping product developers optimize formulations.
Related Standards
- ISO 11609:1995 – Dentistry - Toothpastes - Requirements and test methods relevant for preparing abrasive slurries used in wear testing.
- ISO 8627 – Dentistry - Stiffness of the tufted area of toothbrushes, referenced for selecting appropriate brushes in tests.
- ISO 1183-1:2004 – Plastics - Methods for determining density of non-cellular plastics, used for characterizing specimen density.
- ISO 3696:1987 – Water quality standard for analytical laboratory use, specifying deionized water grade used in testing procedures.
- ISO 1942-2:1989 – Dental vocabulary, providing terminology definitions to ensure consistency in documentation.
Summary
ISO/TR 14569-1:2007 delivers comprehensive guidelines for assessing wear caused by toothbrushing on dental restorative materials, offering standardized test conditions, apparatus, and evaluation criteria. By focusing on this specific wear mechanism, it enables precise, reproducible measurement of material durability important for prosthodontic applications. This technical report supports innovation, quality assurance, and product development within the dental materials industry, ensuring materials meet clinical demands posed by everyday oral hygiene.