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Growing Teeth Formula

Posted on 10. Apr, 2010 by wisdom.

Researchers at the  Institute of Biotechnology of the University of Helsinki developed a computer model reproducing population-level variation in  teeth. This has implications for growing correctly shaped teeth.

With more than 15 years of work, Jukka Jernvall and his team have compiled data on the evolutionary development of mammal teeth and the main aspects of a formula for making teeth emerging.

According to a mathematical computer model, a rather simple basic formula seems to be behind the complex gene puzzle resulting in tooth formations. The jungle of gene networks has a ‘patterning kernel’ which regulates the variation of teeth among individuals. It is possible that human teeth from the incisors to the molar teeth may result from a single factor which regulates cell division.

The researchers have investigated their model on seal teeth. The Ladoga ringed seal collection  at the University of Helsinki served as an ideal population sample  because dentitions are highly variable.

Isaac Salazar-Ciudad and Jukka Jernvall. A computational model of teeth and the developmental origins of morphological variation. Nature, 2010.

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Perfect Looking Teeth

Posted on 24. Nov, 2008 by wisdom.

A new measuring technique determines the effect of dental care products and helps  them so they polish the rough tooth surfaces until they are perfectly smooth, while preserving the tooth enamel.

The tooth surface wears down and gets uneven – and the problem is that dental plaque adheres particularly well to a rough surface. Dentists therefore offer professional cleaning services, removing plaque and discoloration with abrasive prophylactic pastes.

This renders the tooth surface beautifully smooth, making it difficult for bacteria to gain a foothold. Yet there is a risk that the polishing treatment will also grind away precious tooth enamel and dentin at the exposed necks of teeth. The manufacturers therefore have to find the happy medium when developing their prophylactic pastes: The pastes should be just abrasive enough to remove superficial discoloration and plaque, but preferably not wear down the tooth enamel.

Until now, scientists lacked any realistic objective measuring techniques to assess tooth abrasion caused by chewing and by the effect of toothpastes. A leading manufacturer of dental hygiene products asked the Fraunhofer Institute for Mechanics of Materials IWM in Freiburg, one of whose specialties is the analysis and visualization of surface roughness, to help them develop new prophylactic pastes. The effectiveness of a prophylactic paste has so far been measured by how well the granules that it contains are able to smoothen a rough surface.

The test is performed by first roughening tooth enamel or denture materials such as ceramics and titanium to a precisely defined value with an aggressive grinding material. But this does not truly reflect reality, as chewing wears out different materials at different rates. The new measuring method developed by the IWM researchers, a kind of chewing simulation, takes this factor into account.

Dr. Raimund Jaeger discovered when comparing pastes and subsequently analyzing the surfaces, some pastes polish the surface but also unnecessarily ablate the tooth material, producing slight grooves on the tooth surface. The ideal paste, on the other hand, polishes so lightly that only the roughness is eliminated while the tooth enamel is hardly ground at all.

“Obviously, every case is different,” says Jaeger. “Teeth with particularly heavy plaque or discoloration will need a more abrasive paste.” Normally, however, a gentler prophylactic paste will do the job.

Adapted from materials provided by Fraunhofer-Gesellschaft.

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Swimming Causes More Dentist Trips?

Posted on 16. Aug, 2008 by wisdom.

With the recent Michael Phelps frenzy in the 2008 Summer Olympics a lot of people may have a renewed interest in the sport of swimming. I personally have been actively swimming regularily for the past few years.

I recently went on to the American Dental Association (ADA’s website) and took a look at some of their dental minute videos.

One such video discusses how swimming more than 6 hours a week can cause your teeth to become brown. Thus swimming chemicals can stain your teeth. This can be managed though with regular dental exams. To view the video by practicing dentist Dr. Maria Lopez Howell go to the following link http://www.ada.org/public/media/videos/minute/additional_swimmingpoolchemicals_broadband.wmv (you will have to download it)

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