NIOM adds Shore hardness and bond strength characterization to its test repertoire



Methods from ISO 10139-1:2018 and ISO 10139-2:2016 (Soft lining materials for removable dentures – Part 1: Materials for  short-term use, and Part 2: Materials for long-term use) have been added to the NIOM test repertoire. The new test methods are the Shore hardness test for lining material, and the bond strength test for lining on denture base materials. For materials for short-term use the described method is Shore A0 hardness, while for long-term materials the method is Shore A.


Shore hardness testing of soft lining materials.

NIOM also performs other tests by methods given in ISO 10139 parts 1 and 2 where these originate from other standards already performed by our laboratory: the water sorption & solubility for lining materials used long-term is the same method as in ISO 20795-1 Denture base polymers; the consistency test is adopted from ISO 4823 Elastomeric impression materials; and the test method for reproduction of detail is the same as in
ISO 4823.


Independent testing according to an appropriate ISO standard is a means to ascertain compliance with statutory requirements. NIOM’s test reports are recognized by regulatory agencies worldwide, in particular as evidence for compliance with the EU Medical Device Directive and US FDA regulatory requirements.

Bond strength characterization for lining on denture base.

The institute is accredited generally for quality testing of dental materials according to ISO 17025 General requirements for the competence of testing and calibration laboratories by Norwegian Accreditation. NIOM holds specific accreditation for a broad range of physical, mechanical and chemical test methods. Together, these accreditations ensure independent, reliable and high-quality test results.


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