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The 'plasma jet' could replace the hated dentist's drill in as little as three years (file picture) Unlike the dentist's drill, the plasma jet is non-invasive and pain-free. Fear of fillings is a genuine phobia for some people, causing them to avoid visits to the dentist. A new study has shown that firing low-temperature plasma beams at dentine - the fibrous tooth structure below the enamel - can reduce bacteria levels by up to 10,000 times. Researchers in Germany tested the effectiveness of the plasma jet against common dental bugs including Streptococcus mutans and Lactobacillus casei. Both form films on the surface of teeth and are responsible for the erosion of tooth enamel and dentine that causes cavities.

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The scientists infected dentine from extracted human molars with four strains of bacteria and exposed it to plasma for between six and 18 seconds. The longer the treatment continued, the greater the amount of bacteria that was eliminated. Plasmas are produced when atoms in a gas are stripped of one or more of their electrons, leaving them positively charged. Normally plasmas are formed at very high temperatures, but those tested by the German scientists were 'cold' plasmas no hotter than around 40C.

660 pro-b fast recovery for psp. Lead researcher Dr Stefan Rupf, from Saarland University in Homburg, said: 'The low temperature means they can kill the microbes while preserving the tooth. The dental pulp at the centre of the tooth, underneath the dentine, is linked to the blood supply and nerves and heat damage to it must be avoided at all costs.' He added: 'Drilling is a very uncomfortable and sometimes painful experience. Cold plasma, in contrast, is a completely contact-free method that is highly effective. 'Presently, there is huge progress being made in the field of plasma medicine and a clinical treatment for dental cavities can be expected within three to five years.'