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New Nanotechnology Technique may Boost Longevity of Dental Fillings
The tooth-coloured fillings are usually more attractive than silver ones, but the bonds between the white filling and the tooth quickly age and degrade.
"Dentin adhesives bond well initially, but then the hybrid layer between the adhesive and the dentin begins to break down in as little as one year. When that happens, the restoration will eventually fail and come off the tooth," said Dr. Franklin Tay, associate professor of endodontics in the MCG School of Dentistry.
He added: "Our adhesives are not as good as we thought they were, and that causes problems for the bonds."
To make a bond, a dentist etches away some of the dentin's minerals with phosphoric acid to expose a network of collagen, known as the hybrid layer.
Acid-etching prepares the tooth for application of an adhesive to the hybrid layer so that the resin can latch on to the collagen network, but the imperfect adhesives leave spaces inside the collagen that are not properly infiltrated with resin, leading to the bonds' failure.
Thus, in order to prevent the aging and degradation of resin-dentin bonding by feeding minerals back into the collagen network, Tay is investigating guided tissue remineralisation.
Guided tissue remineralisation is a new nanotechnology process of growing extremely small, mineral-rich crystals and guiding them into the demineralised gaps between collagen fibres.
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More News on: Loose Teeth, Tooth Decay, Receding Gums, Tooth Discoloration, Teeth Chart, Life Span or Death Clock, Tips to Live Longer, Dental Check-Up, Root Canal Treatment, Toothache
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