March 15, 2011
Could There Be More Than Lunch Lurking On Your Retainer?
Insufficient cleaning could allow build-up of microbes on orthodontic retainers, researchers at the UCL Eastman Dental Institute have found. Dr Jonathan Pratten and colleagues looked at the types of microbes which live on retainers. This study, which found potentially pathogenic microbes growing on at least 50% of the retainers, is published today in the Society for Applied Microbiology's journal Letters in Applied Microbiology and could indicate a need for the development of improved cleaning products for orthodontic retainers.
Dr Pratten and his team took samples from the mouths of people without retainers and those wearing either of the two most widely used types. As retainers are frequently removed and then replaced in the mouth, the potential for transmission of microbes is high.
Candida and Staphylococcus rarely cause problems in healthy individuals but are potentially highly problematic in people with a compromised immune system. The bacteria on the retainers live in biofilms, which are communities of bacteria living together covered in a layer of slime. Once these biofilms form they are very difficult to remove and often have high levels of resistance to antimicrobials.
Dr Pratten says: "With the growing awareness the public has of hospital-acquired infections it is important to be aware of other potential 'hidden reservoirs' of harmful bacteria which could be introduced to environments where we know they can cause problems."
Whilst the researchers are now looking at developing effective methods of cleaning, for now hygiene is the key to reducing the transmission of these bugs. Anyone handling a retainer should wash their hands before and after use. Careful tooth brushing and mouthwash may also help to keep the retainer clean.
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