評論
打印
From VOA Learning English, this is the Health & Lifestyle report.
Many people fear a visit to the dentist. They are not so much afraid of the doctor, but of the dental equipment and treatments.
Well, fear no more!
A British company says it has developed technology that will end the need for mechanical cleaning of dental cavities. It also says the technology speeds up a natural process of tooth repair.
For over a century, dentists have been repairing cavities the same way. They first remove the decayed, or bad, tooth tissue with an electric-powered drill. Then, they fill the hole in the bone with a metallic or plastic substance.
If the cavity is not too deep, the experience can be unpleasant. However, if it is deep, near the nerve of the tooth, it can be very painful. The worst part is that the process of drilling and filling the cavity has to be repeated for the entire life of that tooth.
Rebecca Moazzez is a senior lecturer at King's College London. She says that this cycle lasts the rest of the tooth's life.
"You're really in that cycle of repair and replacement for the rest of the tooth's life."
Tooth enamel is what we see on the outside of the tooth. The enamel of a damaged tooth can be replaced naturally. This process is called re-mineralization. But it is too slow to stop bacteria from building up in small, narrow areas of the enamel.
A British business called Reminova has developed a method for speeding-up this natural re-mineralization of early-stage cavities.
Jeff Wright is head of the company.
"We've just found a way to make that a much faster process. Driving healthy calcium and phosphate minerals into your enamel and, through a natural process, it will bind on and add to the enamel that's there."
The process begins with a cleaning of the cavity. This does not require power tools. The dentist covers the problem area with a mineral solution, and then uses an electrical current to harden this material. The electricity is too weak for the patient to feel. And the hardened mineral completely fills the cavity.
Researchers say this method could be especially useful for children. Sometimes children have bad experiences at the dentist. They fear the drilling and injections. Who wouldn't be afraid? Better experiences as a child might lead to more visits to the dentist as an adult.
Dr. Barry Quinn works as a consultant at King's College.
"If children have a better experience of going to the dentist, so they haven't had the necessary drilling and injections for routine fillings, then they'll be much more positive in later life and probably become much more regular patients."
Dentists say the new method is most effective on early-stage cavities. The whole treatment lasts about as long as a normal drill-and-fill visit. Researchers say they believe the new method can be further developed for treating late-stage cavities.
And they are quick to note that regular cleaning with fluoride toothpaste helps prevent cavities in the first place.
And that's the Health & Lifestyle report.
I'm Anna Matteo.
VOA譯文由可可原創(chuàng)，未經許可請勿轉載。
