Repair bond strength of bulk-fill composites: influence of different primers and direction of debonding stress -

The purpose of this in vitro study between Finnish and Norwegian scientists was to evaluate the effect of different adhesive primers on the repair bond strength of bulk-fill resin composite and short-term hydrolytic stability of the restorative interface before and after accelerated aging. In addition, the effect of the direction of debonding was examined.

Weakening of direct dental restorative materials -

Wear is an irreversible process affecting both teeth and dental restorations. A recent laboratory study reported on deterioration of a composite resin (Filtek Z250®), a glass ionomer cement (Fuji IX GP®), and a glass hybrid (Equia Forte®) under different types of wear.

Research improves the clinical relevance of in vitro biocompatibility tests -

The biocompatibility of resin-based dental biomaterials has been studied widely, mainly by laboratory studies (in vitro). In a newly published paper, Samuelsen and Dahl overview available data and describe how the research strategy is changing to yield more clinically relevant knowledge.

Study show snus causes gingival retraction and lesions -

Most of the adolescents in a Norwegian cross-sectional study had snus induced lesions, and one fifth had gingival retractions. The severity increased with the amount of snus boxes used and the duration of the snus use, respectively.

Not yet sufficient use of MID in France -

A recent study indicated that a significant proportion of French GDPs do not yet make sufficient use of repair when it comes to defective restoration.

Snus and pregnancy – a risky connection -

Swedish smokeless tobacco, also known as “snus” is popular in the Nordic countries. It is not without risk, however, and during pregnancy the risks are worth knowing.

Resin-based cements – properties affecting clinical success of indirect restorations -

Many clinicians prefer polymer-based, also known as resin-based, cements, when cementing indirect restorations. Especially when the restorations are made of all ceramic materials. A recent paper looks into cement properties that affect clinical success of indirect restorations.

NIOM involved in study for alternative antibacterial methods -

The World Health Organization (WHO) has called for the development of alternative antibacterial methods. In response to this, a team involving three NIOM scientists have investigated endogenous compounds and biopolymers.

Genes a factor in fighting dental erosion -

Erosive tooth wear is a growing problem. While the causes are many, from increased consumption of soda and acidic food, we now know that genes play a role too. A recent NIOM study looks delves into the subject matter.

Cobalt in dental devices -

The use of cobalt in dental devices as crowns, bridges and removable partial prosthesis have now raised concern as cobalt is classified as a CMR (Carcinogenic, Mutagenic, toxic to Reproduction) substance, says Jon E. Dahl, CEO at NIOM.

Effect of Chlorhexidine digluconate on endodontic sealers -

A recent study showed increased antimicrobial activity of three endodontic sealers after chlorhexidine contact. Cell toxicity and physicochemical properties were mostly negatively affected.

New “Universal bonding agents” reliable for repair of composite restorations. -

A recent NIOM-study looked at the reliability of using “Universal bonding agents” in composite-to-composite shear bond strength test. It is worth noting that all nine bonding agents in the study performed as well, or better, than the previous “Gold Standard”, the 3-step etch-and-rinse bonding agent.

Antimicrobial photodynamic therapy gains traction -

Killing off bacteria by using light on a thin film covering, sounds intriguing to say the least. The possibilities would be endless, from restorations to self-cleaning environmental surfaces, and on. A collaborative team from NIOM and the University of Oslo (UiO) is currently making strides in this direction.

Electrostimulation therapy for dry mouth -

Feeling of dry mouth, often called xerostomia, is not considered a serious medical condition in itself, but it can cause complications like tooth decay and mouth sores. Treating it is therefore imperative for good oral health. A recent paper explores electrostimulation as a treatment option.

Wear on and inside implants -

Wear on the different parts of a dental implant, can cause particle release as well as shorten the lifetime of the implant. A recently published study at NIOM in collaboration with the University of Gothenburg looked at particle release from dental implants in saliva during dynamic loading.

Forensic identification of deceased persons with no dental restorations? -

Since 1984, Interpol has used three primary identifiers to establish the identity of a deceased person. The identifiers are fingerprint analysis, DNA analysis and comparative dental analysis. While fingerprinting is mostly the same, DNA-analysis has improved and dental analysis has become more complex.

3D printing in odontology -

Those who were able to attend the last IDF trade fair in Cologne, the year before the pandemic, saw 3D printers everywhere. There has been a steady growth in the use of 3D printing to produce resin-based appliances. In order to clarify the various 3D methods, NIOM’s Ida Stenhagen has written a review article.

Season greetings from NIOM -

As another year marked by covid is ending, we look back at 12 months of progress and growth. We have three new hires, and 17 published papers. NIOM is steaming ahead towards its 50th anniversary in May 2022. An institute founded on the idea that the Nordic countries can accomplish more together than apart. That […]

Medical devices in dentistry – the new MDR regulation -

The new regulation for Medical Devices (MDR 2017/745) came into full force from May 26th 2021. Materials already approved in accordance with the old directive can continue to be purchased until 2025.

When to intervene in the caries process? -

NIOMs Frode Staxrud, DDS, Ph.D., has a new article out, in which he makes recommendations on when to intervene in the caries process for both new and existing caries lesions. He classifies treatments into three intervention levels: non-invasive, micro-invasive , and invasive or restorative strategies.

New review article: genetic aspects of dental erosive wear and dental caries -

The high prevalence of dental erosion and dental caries among certain groups, and observations that not all individuals appear to be at risk, has sparked research on genetic effects related to these conditions.

Improved bonding of zirconia crowns with resin-based cement -

Several pre-cementation procedures advocate enhancing adhesion between zirconia and resin-based cements. There is, however, limited documentation on how these pre-treatments affect the strength of high translucent zirconia.

Lack of training hinders best practice -

While stainless-steel crowns (SSCs) are recommended for restorative treatment of teeth severely affected by caries, fractures or dental developmental disorders, they are not widely used. A new NIOM study among Norwegian and Finnish dentists explores why.

Is blue light damaging to our skin? -

Blue light beams at us during procedures at the clinic, from the screens we watch between patients, and from our ever present mobile phones. Recently we have seen cosmetic companies selling creams marketed towards blue-light damage. But can blue light really damage the skin, and if so- how?

New teeth- straight from the lab? -

The dental community has long been fascinated by the thought of growing a third set of teeth. According to Nils Jacobsen and colleagues’ recent overview article on the subject, the past 40 years of research has seen great strides towards this goal. There have been several key breakthroughs, based heavily on knowledge acquired in stem cell research.

In Memoriam professor Nils J. Jacobsen 1931-2021 -

Professor Nils J. Jacobsen passed away on Easter Sunday, the 4th of April. His legacy after almost 70 years in the field of odontology is significant. His last article was published less than three weeks ago.

Erosive tooth wear: Young men at risk -

Young men are most at risk as carbonated soft drinks wear down young adult’s teeth. In a new questionnaire-based study performed in Denmark, almost all the respondents blamed erosive tooth wear in young adults on carbonated soft drinks.

Harmful compound found in charcoal toothpaste -

A new NIOM study found the toxic compound naphthalene in a charcoal toothpaste, raising questions about the safety of such products.

End of year greeting -

The truly unusual year 2020 is drawing to a close. NIOM’s services have been operational throughout the year thanks to our dedicated staff.

Deviations in the composition of alloys -

A recent NIOM study revealed several irregularities in single dental crowns. The PFM or porcelain-fired-on-metal crowns had been ordered from laboratories both within and outside of Norway.

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.