Cell line affects the results of toxicity studies -

The choice of cell line is of no small matter when conducting in vitro studies. A recent NIOM study has shown how differently five cell lines reacted, although consistently so, when testing for their interaction with two methacrylates. The message is that the choice of cell line will largely affect the results obtained.

Fabrication techniques and ion release in cobalt-chromium alloys -

A recent study tested the behaviour of cobalt-chromium alloys under corrosive conditions mimicking the acidity observed in oral biofilm. Cobalt-chromium has become the alloy of choice for the framework of porcelain-fixed-to-metal (PFM) prosthetics also in combination with titanium implants. The alloy specimens were fabricated by both traditional casting, by milling and by laser melting and sintering.

Arne Hensten, a frontrunner in the world of dentistry, retires -

It is with the greatest appreciation we, his colleagues at NIOM, wish dr. odont Arne Hensten a long and healthy retirement. He has been our “grand old man”, tirelessly accumulating and sharing knowledge since he was first employed with us as a researcher in 1974.

Saliva proteins may protect against erosive tooth wear -

A new study on protein profiles in saliva show unexpected promise. The results point to the possibility that the presence of certain proteins can protect against erosive tooth wear.

The Norwegian National Network Group for Oral Health Research and Innovation -

In 2014, the Norwegian Ministry of Health and Care Services published a white paper on the status of oral health research in Norway. The white paper emphasised that there were too many small research groups in the country, they focused on too many diverse subjects, and there was too little national and international collaboration.

From the instrument park: Liquid-induced erosion simulator -

NIOM’s new cycling device simulates the exposure of different drinks on dentition and dental materials. By combining the effects of saliva, abrasion and tooth brushing, the researcher can simulate a clinically relevant environment.

Commonly used alloys tested -

Cobalt-chromium (Co-Cr) alloys are becoming more and more popular with the rise of milling technology. This makes it more important than ever to make sure that dental restorations based on these materials are safe for patients

Summer greetings -

Read about how covid19 is affecting NIOM this summer and fall. Our offices will remain open all summer, though response time may vary.

Prevalence of molar-incisor-hypomineralisation among 8-year-olds -

Dentists often see patients with developmental defects in tooth enamel. The characteristically white, brown or yellow stains are present from when the tooth first erupts. But, how common are these defects?

Forensic odontology webinar –questions answered -

A novel fast-setting calcium silicate cement with fluoride, intended for root fillings, shows promising results on bond strength to dentine.

Protooth shows promising results -

A novel fast-setting calcium silicate cement with fluoride, intended for root fillings, shows promising results on bond strength to dentine.

Guidelines on phthalates in medical devices -

The European commission has approved additional Guidelines on phthalates that are carcinogenic, mutagenic, or toxic to reproduction (CMR), or have endocrine-disrupting (ED) properties. NIOMs Head of laboratory Dr. Hilde M. Kopperud is among the experts behind the new guidelines, which complement the legal documentation to the MDR.

Significant health risks of using snus while pregnant -

An increased risk of stillbirth, preeclampsia, and oral cleft malformations, are among risks of using Swedish snus while pregnant. Read more about the report here.

Preferred treatment option of severely destroyed primary molars and hypomineralisation defects in children -

There is published literature supporting the use of stainless steel crowns (SSC) for severely destroyed primary molars and hypomineralisation defects in children. However, until now, little is known about the dentists` preferences in this area. A newly published paper by NIOM and collaborators holds the answer.

Faulty bond strength measurements? -

The most commonly used bonding stress method for testing adhesives and cement, the thermal cycling, jeopardizes the results if not done with caution. This leads to a more favorable bond strength than the true value.

From the instrument park: The Zwickline test instrument -

Strength and elasticity of materials and of bonding are all important characteristics of dental restorative and prosthetic products. NIOM performs many tests and measurements that involve stretching or compression of test pieces. For polymer-based composite materials or ceramics, these tests will in future be performed on our newly acquired Zwickline 5.0.

How to talk to fluoride sceptics -

As recent news articles highlight the dangers of ski wax containing fluorinated compounds, more patients are becoming skeptical towards fluoride in toothpaste. It is vital to be clear that these are two completely different forms of fluorine element with respect to both toxicity and reactivity.

New scanning electron microscope -

NIOM have 17 laboratories, and a vast, up- to date instrument park. Today we would like to highlight our new key instrument in materials research, nicknamed the SEM.

NIOMs first year with NORCE -

NIOMs first year with NORCE, has been about business as usual as well as gearing up for the future.

Do fluoride and BHT in toothpaste pose risks for your patients? -

Read why NIOM researchers, Drs. Aida Mulic and Ellen Bruzell, agree with recent risk assessments on fluoride and butylated hydroxytoluene, BHT.

Magic in the workshop -

It’s not quite Gepetto’s workshop, but magic still happens at NIOM’s instrument workshop. The two toolmakers both have engineering backgrounds, as well as a combined 42 years of experience at NIOM.

Clinical relevance of HEMA-toxicity studies -

Several studies show “leakage” of methacrylates during, and shortly after, treatment resin based dental materials. Read about the clinical relevance here.

Why do research at NIOM? -

Every year NIOM welcome guest researchers, Ph.D candidates and Master students to our midst. Read about the experience of our current host of Master students.

How healthy were the Vikings’ teeth? -

Though extensive research has been performed on Viking settlements, few have been from an odontological point of view. Finally, this is changing.

Meet NIOM at CED-IADR in Madrid on September 19th -

NIOM scientist Aida Mulic is among the lecturers behind the symposium “Dental erosion – the new toothache.” Meet her and our CEO, Professor Jon E. Dahl, after the event.

Update your technical documentation before MDR -

3D-printers open up exciting new fields of research, treatment and testing. This makes one a natural acquisition for NIOM’s instrument park. Read more about which printer we chose, and why.

NIOM aquires open material 3D-printer -

3D-printers open up exciting new fields of research, treatment and testing. This makes one a natural acquisition for NIOM’s instrument park. Read more about which printer we chose, and why.

Melt etching outperforms sandblasting -

For stronger and longer lasting dental crowns, a new NIOM study suggests that melt etching is better than sandblasting.

Open material 3D-printer improves testing -

3D-printers open up exciting new fields of research, treatment and testing. This makes one a natural acquisition for NIOM’s instrument park. Read more about which printer we chose, and why.

Snus dangers – and how to help -

New research shows that the easiest way to help and encourage patients to stop using snus is underutilized.

New tooth wear simulation device -

NIOM’s new mechanical masticator performs wear simulation of oral conditions.

Your guide to material selection -

Like it or not – regulatory issues affect the materials and devices offered to us on the European market.

Marginal gap of digitally made dental single crowns -

Icelandic dentists are well educated for diagnosis and treatment of dental erosion, but more emphasizes on causative factors are needed. These are the conclusions from a recent questionnaire study among dentists in Iceland.

Opinions and Treatment decisions for Dental Erosion -

Icelandic dentists are well educated for diagnosis and treatment of dental erosion, but more emphasizes on causative factors are needed. These are the conclusions from a recent questionnaire study among dentists in Iceland.

Residual stress in bench- and furnace-cooled porcelain-fused to zirconia appliances -

A new study of veneered zirconia shows that the magnitude of residual stresses can only be estimated reliably from the manufacturers’ thermal expansion coefficients if the veneered prosthesis is cooled slowly after the final firing.

How can dental materials be made better? -

Future resin-based dental materials must combat the reasons current materials fail, mainly secondary caries and fracture, but still be easy for the dentist to use and safe for the patient.

Colour assessment. How good are you? -

Finding the best colour match for your restorations, crowns and bridges, is often frustrating, but do not despair, as training and practice makes you better and more confident.

Reason for loosening of ceramic restorations -

The resin cement forms the weakest link for a ceramic restoration. This was found in an investigation of the de-bonding of resin cementation of zirconia or lithium di-silicate ceramic to bovine dentin.

Peroxide-free tooth whitening -

The peroxide-free tooth whitening products are less effective than those based on peroxides and the effect is only transitory. Both peroxide-free and peroxide containing products gave an initial lightening of the tooth color. However, the effects of peroxide-free products were only transitory.

Digital dentistry -

Digital manufacturing using intraoral scanners appears to provide equivalent fit compared to conventional technique for smaller prosthetic constructions. Milled composites have a less toxic potential compared to traditional light cured directly placed composite restorations.