Overview
EN ISO 29022:2013 - "Dentistry - Adhesion - Notched-edge shear bond strength test (ISO 29022:2013)" is a CEN-endorsed international standard that specifies a reproducible shear test method to determine the adhesive bond strength between direct dental restorative materials (principally dental adhesives) and tooth structure (dentine or enamel). The standard covers substrate selection, tooth storage and handling, specimen production, the notched-edge shear test apparatus and procedure, data recording and reporting.
Key Topics and Requirements
- Scope and intent: Designed mainly for evaluating dental adhesives; can be adapted for some adhesive restorative materials (e.g., glass‑ionomer) with modification. The method is technique sensitive and requires experience.
- Substrate selection: Recommends bovine incisors or erupted human third molars; specifies preferred bonding surfaces (labial for bovine, buccal/mesial/distal/lingual for human).
- Tooth storage: Use teeth within 6 months of extraction; store in water (ISO 3696 grade 3) at (4 ± 4)°C; permissible non‑reactive preservatives (e.g., 1% chloramine‑T) with rinsing before use.
- Surface preparation and potting: Requires a flat, reproducible surface; keep surfaces wet to avoid dehydration; details potting (mounting) methods and pulp chamber protection.
- Specimen production: Covers preconditioning, adhesive application, insertion into bonding clamp, composite placement, specimen handling and storage prior to testing.
- Notched-edge shear test: Defines apparatus drawings, shear loading geometry, test execution, and result treatment. Annex A provides detailed apparatus drawings.
- Reporting: Specifies the information to record (substrate type, storage history, test conditions, failure mode, bond strength results).
Applications and Users
- Who uses it: Dental materials researchers, dental laboratories, manufacturers of dental adhesives and restorative materials, regulatory bodies and test laboratories performing adhesion testing.
- Practical uses:
- Comparative testing of adhesive formulations.
- Quality control during product development and manufacturing.
- Supporting regulatory submissions or internal claims about bond strength to dentine/enamel.
- Benefits: Provides a standardized, reproducible method to document adhesion performance; facilitates comparison between materials and consistent reporting.
Related Standards (if applicable)
- ISO 1942 - Dentistry - Vocabulary
- ISO 3696 - Water for analytical laboratory use - Specification and test methods
- ISO 6344-1 - Coated abrasives - Grain size analysis - Part 1
- Note: The standard highlights potential patent claims related to shear bond strength testing; users should review the document for patent notices and licensing information.
Keywords: EN ISO 29022, notched-edge shear bond strength test, dentistry adhesion, dentine bond strength, dental adhesives, ISO 29022:2013, tooth substrate, specimen preparation, shear test.
