Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Gloomy forecast for Nobel Direct after three years

21.12.2007
Three years after patients were given Nobel Direct dental implants, the risk of the implant loosening has increased even more. A follow-up by researchers at the Sahlgrenska Academy in Sweden shows that eight per cent of the implants are lost.

Nobel Direct was launched in 2004 by Nobel Biocare AB. The implants were considered a great innovation, as they could be screwed directly into the jawbone without having to first lift up the mucous membrane.

“We have followed up 48 patients who were among the first to get the implant. For each passing year, we have been able to see how the problems related to these implants have grown more and more,” observes Pär-Olov Östman, a dentist who will be presented the study tomorrow at the defence of his dissertation.

After one year, about five per cent of the implants had been lost, and 20 per cent of the remaining implants showed bone loss of more than three millimetres. The new report indicates that after three years, eight per cent of the implants had been lost, and 25 per cent of the remaining implants showed bone loss of more than three millimetres.

“We believe that the problems related to Nobel Direct result both from the design of the implant and an uneven surface against the soft tissue in combination with the method of treatment recommended by the company,” according to Professor Lars Sennerby.

For some time, Nobel Direct was marketed as an implant that was easy to use, and therefore suitable for less experienced dentists. According to the company’s marketing, the implant would also counteract marginal bone loss.

”If the implant is inserted in a more conservative manner, avoiding direct load, the results appear to be better. We believe that there are additional implants with similar design that can also cause problems if they are inserted in the same way as Nobel Direct. However, we are unable to draw any certain conclusions regarding these,” says Professor Tomas Albrektsson, the head of the Department for Biomaterials Science at the Sahlgrenska Academy.

At the request of the Medical Products Agency, Nobel Biocare AB is now working to clarify certain information in the product information material. The company also markets several other titanium implants that have been scientifically proved to be very safe, including a Brånemark implant with the same patented surface as the Nobel Direct implant in dispute.

FACTS ON DENTAL IMPLANTAT
The implant is a type of artificial dental root made of titanium. The titanium screw is surgically inserted in the jawbone, and must often become well-secured there so that after several months, it can be used as a foundation for crowns, bridges and dentures. The method was invented by Professor Per-Ingvar Brånemark at the Sahlgrenska Academy in the 1960s. There are several types of titanium appliances, but all are based on titanium being a metal with the unique property of being able to be osseointegrated.

Ulrika Lundin | alfa
Further information:
http://www.sahlgrenska.gu.se

More articles from Health and Medicine:

nachricht Nanoparticles as a Solution against Antibiotic Resistance?
15.12.2017 | Friedrich-Schiller-Universität Jena

nachricht Plasmonic biosensors enable development of new easy-to-use health tests
14.12.2017 | Aalto University

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Engineers program tiny robots to move, think like insects

15.12.2017 | Power and Electrical Engineering

One in 5 materials chemistry papers may be wrong, study suggests

15.12.2017 | Materials Sciences

New antbird species discovered in Peru by LSU ornithologists

15.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>