Presence and leaching of bisphenol a (BPA) from dental materials -

BPA has been reported to leach from some resin-based dental restorative materials and materials used for orthodontic treatment. To confirm and update previous findings, especially in light of the new temporary lower threshold value for tolerable daily BPA intake, leaching of BPA from 4 composite filling materials, 3 sealants and 2 orthodontic bonding materials were investigated.

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

NIOM has added two new tests to their repertoire. The new test methods are the Shore hardness test for lining material, and the bond strength test for lining on denture base materials.

Lysherding – så enkelt og så vanskelig. -

For kort herdetid kan føre til mangelfull herding (polymerisasjon) av komposittmaterialer. For lang herdetid kan øke risiko for varmeskade på oralt bløtvev og pulpa. Herdelampens lysstyrke (irradians) reduseres når avstanden øker mellom lysutgangen og materialflaten.
For å opprettholde lysdosen som kreves for tilstrekkelig herding, må herdetiden økes. Kortere lysherdingstider enn omtrent 10 sekunder kan føre til utilstrekkelig herding av materialet.

Concentration of eluted monomers from the composites, in microgram per square centimeter surface area.
Toxicity testing of composites -

None of the tested composite materials was deemed less safe to use than the others, a recent report from NIOM concluded. The release of monomers from the different composites was similar. Initial cytotoxicity screening of extracts of the materials indicated some differences between the products. However, further evaluations could not verify a cytotoxic potential.

NIOM to Turku Biomaterials Days 2017 -

Turku Biomaterials Days 2017 is held October 26-27 in Finland at Turku Science Park. The topic this year is “Interfaces and Interphases” and the conference aims to provide a clear understanding and key concepts on the interactions between different biomaterials and the surrounding tissues. NIOM is represented with Head of Laboratory Hilde M. Kopperud and […]