8月27日VOA聽力：加快鈣和礦物資接收的齲齒新療法
For over a hundred years, dentists have beenrepairing cavities by removing the decayed toothtissue with a drill and filling the hole with metal orplastic material. Depending on the cavity’s depth,this method can be unpleasant to downright painfulfor the patient, and it has to be repeated periodically.
“You're really in that cycle of repair and replacement for the rest of the tooth's life,”
A damaged tooth’s enamel can be replaced naturally, but the process is too slow to stop thework of bacteria that build up in tiny cracks. A British company called Reminova has developeda method for speeding up this natural remineralization of early-stage cavities.
“We've just found a way to make that a much faster process," "Driving healthy calcium andphosphate minerals into your enamel, and through a natural process, it will bind on and add tothe enamel that's there."
After cleaning the early-stage cavity with a method that does not require drilling, the dentistcovers it with a mineral solution and applies an electrical current that is too weak for thepatient to feel. The deposited mineral quickly hardens, completely filling the cavity.
Researchers say this method could be especially useful for children.
“If children have a better experience of going to the dentist, so they haven't had necessarydrilling and injections for routine fillings, then they'll be much more positive in later life andprobably become much more regular patients,"
Dentists point out that the new method is most efficient on early-stage cavities, which makesregular dental checkups essential. The whole treatment lasts about as long as a regular drill-and-fill procedure.
Researchers say they are confident that the new method can be further developed for treatinglater-stage cavities. And they remind us that regular brushing with fluoride toothpaste helpsprevent cavities in the first place.
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